IMPCO TECHNOLOGIES INC
DEF 14A, 1997-10-07
MOTOR VEHICLE PARTS & ACCESSORIES
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<PAGE>

                                     SCHEDULE 14A
                                    (RULE 14A-101)

                       INFORMATION REQUIRED IN PROXY STATEMENT

                               SCHEDULE 14A INFORMATION

             PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                       EXCHANGE ACT OF 1934 (AMENDMENT NO. __)

Filed by the Registrant  /X/

Filed by a Party other than the Registrant  / /

Check the appropriate box:

/ /  Preliminary Proxy Statement              / / Confidential, For Use of the
                                                  Commission Only (as Permitted
/X/  Definitive Proxy Statement                   by Rule 14a-6(e)(2))

/ /  Definitive Additional Materials

/ /  Soliciting Material Pursuant to
     Rule 14a-11(c) or Rule 14a-12

                               IMPCO Technologies, Inc.
       -----------------------------------------------------------------------
                   (Name of Registrant as Specified in Its Charter)

       -----------------------------------------------------------------------
       (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of filing fee (Check the appropriate box):
/X/  No fee required
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

     (1) Title of each class of securities to which transaction applies:

         --------------------

     (2) Aggregate number of securities to which transaction applies:

         --------------------

     (3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee
is calculated and state how it was determined):
                                               ---------------------------------

- - - --------------------------------------------------------------------------------

     (4) Proposed maximum aggregate value of transaction:
                                                         ----------------------

     (5) Total fee paid:
                        -------------------------------------------------------

     / / Fee paid previously with preliminary materials.

     / / Check box if any part of the fee is offset as provided by
Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting
fee was paid previously.  Identify the previous filing by registration statement
number, or the form or schedule and the date of its filing.

     (1) Amount previously paid:
                                -----------------------------------------------

     (2) Form, Schedule or Registration Statement No.:
                                                      -------------------------

     (3) Filing Party:
                      ---------------------------------------------------------

     (4) Date Filed:
                    -----------------------------------------------------------


<PAGE>
                            IMPCO TECHNOLOGIES, INC.
 
                                ----------------
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
 
                             ---------------------
 
To the Stockholders of
 
  IMPCO Technologies, Inc.
 
    Notice is hereby given that the Annual Meeting of Stockholders of IMPCO
Technologies, Inc. will be held at 1:30 p.m. local time on November 13, 1997 at
the Sheraton Cerritos Hotel Towne Center, 12725 Center Court Drive, Cerritos,
California 90703 for the following purposes:
 
    (1) To elect three directors for a term of three years;
 
    (2) To consider and vote upon a proposal to approve the 1997 Incentive Stock
       Option Plan;
 
    (3) To ratify the appointment of Ernst & Young LLP as the Company's
       independent public accountants; and
 
    (4) To transact such other business as may properly come before the meeting.
 
    Stockholders of record at the close of business on September 18, 1997, will
be entitled to notice of and to vote at the meeting and any adjournment thereof.
The vote of each stockholder is important. Whether or not you plan to attend the
meeting, you are requested to date and sign the enclosed proxy card and return
it promptly.
 
                                          By Order of the Board of Directors,
 
                                          Dale L. Rasmussen
 
                                          SECRETARY
 
Cerritos, California
 
October 10, 1997
<PAGE>
                            IMPCO TECHNOLOGIES, INC.
 
                              16804 GRIDLEY PLACE
 
                           CERRITOS, CALIFORNIA 90703
 
                            ------------------------
 
                                PROXY STATEMENT
 
                             ---------------------
 
                         INFORMATION REGARDING PROXIES
 
    This Proxy Statement and the enclosed proxy are furnished in connection with
the solicitation of proxies by the Board of Directors of IMPCO Technologies,
Inc. (the "Company") for use at the Annual Meeting of Stockholders to be held on
Thursday, November 13, 1997, at 1:30 p.m. local time, at the Sheraton Cerritos
Hotel Towne Center, 12725 Center Court Drive, Cerritos, California 90703, and
any adjournment thereof.
 
    These proxy materials are being mailed to stockholders commencing on or
about October 10, 1997. Expenses of solicitation of proxies will be paid by the
Company. Solicitation will be by mail. There may be telegraph, telephone or
personal solicitations by directors, officers, and employees of the Company
which will be made without paying them additional compensation. The Company will
request banks and brokers to solicit proxies from their customers and will
reimburse those banks and brokers for reasonable out-of-pocket costs for this
solicitation.
 
    If the enclosed proxy is properly executed and returned, it will be voted in
accordance with the instructions specified thereon. In the absence of
instructions to the contrary, it will be voted (i) for all of the nominees for
the Company's Board of Directors listed in this Proxy Statement, (ii) for
approval of the 1997 Incentive Stock Option Plan, and (iii) for ratification of
the appointment of Ernst & Young LLP as the Company's independent public
accountants. If other matters come before the meeting, it will be voted in
accordance with the best judgment of the persons named as proxies in the
enclosed proxy. Execution of the proxy will not in any way affect a
stockholder's right to attend the meeting or prevent voting in person. A proxy
may be revoked at any time by delivering written notice to the Secretary of the
Company before it is voted.
 
    Only stockholders of record at the close of business on September 18, 1997
are entitled to notice of and to vote at the Annual Meeting or any adjournment
thereof. The holders of shares of Common Stock and 1993 Series 1 Preferred Stock
representing one-third of the outstanding voting rights of the stockholders
entitled to vote at the Annual Meeting will constitute a quorum at the Annual
Meeting. Abstentions and broker non-votes will be counted for purposes of
determining the presence or absence of a quorum.
 
                           I.  ELECTION OF DIRECTORS
 
    The Board of Directors is divided into three classes, each consisting of
three Directors, with the three classes serving staggered three-year terms. The
Directors elected at the Annual Meeting will be elected for three-year terms.
Each Director will hold office until the first meeting of stockholders
immediately following expiration of his term of office and until his successor
is qualified and elected.
 
    Although the Board of Directors anticipates that all of the nominees will be
available to serve as Directors of the Company, if any of them do not accept the
nomination, or otherwise are unwilling or unable to serve, the proxies will be
voted for the election of a substitute nominee or nominees designated by the
Board of Directors.
 
                                       1
<PAGE>
    Directors are elected by a plurality of the votes cast by the holders of the
Common Stock and the 1993 Series 1 Preferred Stock present in person or
represented by proxy and entitled to vote at the Annual Meeting. Any shares not
voted (whether by abstention, broker non-vote or votes withheld) are not counted
as votes cast for or against the nominees and will be excluded from the vote.
 
                          INFORMATION ABOUT DIRECTORS
                           AND NOMINEES FOR ELECTION
 
    The names and ages of the nominees and the other Directors, the year in
which each first became a director of the Company, their principal occupations
and certain other information are as follows:
 
                NOMINEES FOR ELECTION TO TERMS EXPIRING IN 2000
 
    PETER B. BENSINGER, age 61, has been a Director since March, 1995. He has
been the President and CEO of Bensinger, DuPont & Associates, a consulting firm
providing consulting, training and employee assistance programs, since 1982. Mr.
Bensinger served as Administrator of the U.S. Drug Enforcement Administration
from January 1976 to July 1981.
 
    RAWLEY F. TAPLETT, age 76, has been a Director of the Company since May
1978, and serves as Chairman of the Board. He is the founder and owner of R.F.
Taplett Fruit and Storage Company, a grower, packer and marketer of fruit,
primarily apples. He is also the principal shareholder, and officer and
director, of Whitestone Orchards, Inc., which owns and operates apple orchards.
 
    DOUGLAS W. TOMS, age 67, is the Chairman of the Executive Committee and has
been a Director of the Company since October 1980. He served as President and
Chief Executive Officer of the Company from October 1980 to April 1989. Since
April 1989, Mr. Toms has been a consultant to American Honda Motor Company, Inc.
 
                   DIRECTORS WHOSE TERMS CONTINUE UNTIL 1998
 
    V. ROBERT COLTON, age 67, has been a Director since March 1989. Mr. Colton
is a retired dentist and has engaged in real estate investment and development
activities for a number of years.
 
    PAUL MLOTOK, age 56, has been a Director since April 1997. He has been a
principal with Global Business Network (GBN), a consulting firm specializing in
strategy development particularly in the energy and natural resources
industries, since June 1995. Prior to joining GBN, Mr. Mlotok was an oil analyst
at Morgan Stanley & Co.
 
    ROBERT M. STEMMLER, age 62, has been a Director since May 1993, and became
the President and Chief Executive Officer of the Company on July 1, 1993. He was
a full-time consultant to the Company from December 1992 until becoming
President and CEO. From 1988 until December 1992, Mr. Stemmler was the Chief
Operating Officer of Sargent Fletcher Company, a manufacturer of fuel tanks,
aerial refueling systems and specialty mission equipment for military aircraft.
He was the General Manager of IMPCO Technologies, Inc. from 1982 to 1985.
 
                   DIRECTORS WHOSE TERMS CONTINUE UNTIL 1999
 
    NORMAN L. BRYAN, age 56, has been a Director since November 1993. He was
employed by Pacific Gas and Electric Company until his retirement in 1994. Mr.
Bryan was Vice President, Marketing from February 1993 until December 1994, and
was Vice President, Clean Air Vehicles from February 1991 to February 1993.
 
    DON J. SIMPLOT, age 62, has been a Director since May 1978. He is the
President of Simplot Industries, Inc., which is engaged in agricultural
enterprises, and a Vice President of J.R. Simplot Company, which is also engaged
in agricultural enterprises. Mr. Simplot is a Director of Micron Technology,
Inc., a
 
                                       2
<PAGE>
designer and manufacturer of semiconductor memory components primarily used in
various computer applications.
 
               MEETINGS OF THE BOARD OF DIRECTORS AND COMMITTEES
 
    During the fiscal year ended April 30, 1997, there were three meetings of
the Board of Directors. Each Director attended at least 75% of the total number
of meetings of the Board of Directors and committees on which the Director
served, with the exception of V. Robert Colton.
 
    Members of the Executive Committee are Douglas W. Toms, Chair, Peter B.
Bensinger, Robert M. Stemmler and Rawley F. Taplett. The Executive Committee has
the authority to exercise all of the authority of the Board of Directors, except
that it may not recommend to the stockholders proposals to be approved by the
stockholders, amend the Bylaws, or amend the Certificate of Incorporation. The
Executive Committee did not meet during the fiscal year ended April 30, 1997.
 
    Members of the Audit Committee are Norman L. Bryan, Chair, and Douglas W.
Toms. The Audit Committee reviews with the Company's independent auditors the
scope, results and costs of the annual audit and the Company's accounting
policies and financial reporting. The Audit Committee met two times during the
fiscal year ended April 30, 1997.
 
    Members of the Compensation Committee are Douglas W. Toms, Chair, Don J.
Simplot and Rawley F. Taplett. The function of the Compensation Committee is to
consider and propose executive compensation policies and submit to the Board of
Directors reports recommending compensation to be paid to the Company's
executive officers. The Compensation Committee met once during the fiscal year
ended April 30, 1997.
 
    Members of the Strategic Planning Committee are Peter B. Bensinger, Chair,
Norman L. Bryan, Robert M. Stemmler and Douglas W. Toms. This committee is
responsible for developing long-term strategic planning for consideration by the
Board of Directors. The Strategic Planning Committee met two times during the
fiscal year ended April 30, 1997.
 
    The Board of Directors does not have a standing nominating committee.
 
    Edwin J. Schneebeck served as a Director until his death on July 28, 1997.
He was Vice Chairman of the Board of Directors and a member of the Executive,
Audit and Compensation Committees.
 
                           COMPENSATION OF DIRECTORS
 
    Each Director who is not an employee of the Company is paid an attendance
fee of $1,000 plus out-of-pocket expenses for each Board or Committee meeting
attended. In addition, the Chairman and Vice-Chairman of the Board of Directors
are each paid an annual retainer of $50,000 plus reimbursement of out-of-pocket
expenses, and provided an auto allowance of $1,000 per month. The Company
provides medical insurance for the Chairman of the Executive Committee.
 
    A total of 290,000 options have been granted to Directors under the 1993
Stock Option Plan for nonemployee Directors, of which 240,000 are held by
Messrs. Bensinger, Bryan, Colton, Moltok, Simplot, Taplett and Toms. The
remaining 50,000 options are held by the estate of a deceased Director. 60,000
options were available for future grants as of April 30, 1997. Option exercise
prices are the higher of (i) the average market value of the stock for the 15
trading days following the date of grant and (ii) the market value on the
fifteenth trading day following the date of grant. Options are not assignable
and vest cumulatively at the rate of 25% annually, beginning on the first
anniversary date of grant. However, if a Director dies, becomes disabled or
retires at age 62 or later, then options vest at the rate of 25% for each full
calendar year in which optionee served as a Director of the Company. Options
must be exercised while a Director or within three months following termination
as Director, unless termination results from death
 
                                       3
<PAGE>
or disability, in which case options may be exercised during the one-year period
following termination. In no event may options be exercised more than ten years
after date of grant.
 
                               VOTING SECURITIES
 
    Stockholders eligible to vote at the Annual Meeting are those of record at
the close of business on September 18, 1997. The voting securities of the
Company consist of Common Stock and 1993 Series 1 Preferred Stock. At August 29,
1997, 5,814,587 shares of Common Stock and 5,950 shares of 1993 Series 1
Preferred Stock were outstanding.
 
    Each outstanding share of Common Stock is entitled to one vote on all
matters to be presented at the meeting. Each share of 1993 Series 1 Preferred
Stock is also entitled to vote on all such matters and is entitled to the number
of votes equal to the number of full shares of Common Stock into which it was
convertible on the record date. On that date, each share of 1993 Series 1
Preferred Stock was convertible into the number of shares of Common Stock that
results from dividing $1,000 by a conversion price of $5.30 per share, or 188
votes.
 
                     OWNERSHIP OF CERTAIN BENEFICIAL OWNERS
                                  COMMON STOCK
 
    The following table sets forth information as of August 29, 1997, with
respect to all stockholders known by the Company to be the beneficial owners of
more than 5% of the outstanding Common Stock. Except as otherwise specified,
each named beneficial owner has sole voting and investment power with respect to
the shares set forth opposite his or her name.
 
<TABLE>
<CAPTION>
                                                                AMOUNT AND NATURE OF  PERCENT OF
NAME AND ADDRESS OF BENEFICIAL OWNER                            BENEFICIAL OWNERSHIP     CLASS
- - - --------------------------------------------------------------  --------------------  -----------
<S>                                                             <C>                   <C>
Estate of Edwin J. Schneebeck ................................         1,361,451(1)        21.02%
  P.O. Box 5245
  Tacoma, WA 98405
 
Rawley F. Taplett ............................................           615,340(2)         9.72%
  P.O. Box 2188
  Wenatchee, WA 98801
 
Timothy J. Schneebeck ........................................           445,601            7.59%
  P.O. Box 5245
  Tacoma, WA 98405
 
Mary Chichester ..............................................           356,644(3)         5.96%
  714 East 48th Street
  Tacoma, WA 98404
</TABLE>
 
- - - ------------------------
 
(1) Includes 50,000 shares subject to options under Directors Stock Option Plan
    and 613,671 shares subject to conversion rights under 3,250 shares of 1993
    Series 1 Preferred Stock.
 
(2) Includes 50,000 shares subject to options under the Directors Stock Option
    Plan and 169,940 shares subject to conversion rights under 900 shares of
    1993 Series 1 Preferred Stock.
 
(3) Includes 166,666 shares subject to a presently exercisable warrant.
 
                                PREFERRED STOCK
 
    The following table sets forth information as of August 29, 1997, with
respect to all stockholders known by the Company to be the beneficial owners of
more than 5% of the outstanding 1993 Series 1
 
                                       4
<PAGE>
Preferred Stock. Each named beneficial owner has sole voting and investment
power with respect to the shares set forth opposite his name.
 
<TABLE>
<CAPTION>
                                                                 AMOUNT AND NATURE OF   PERCENT OF
NAME AND ADDRESS OF BENEFICIAL OWNER                             BENEFICIAL OWNERSHIP      CLASS
- - - ---------------------------------------------------------------  ---------------------  -----------
<S>                                                              <C>                    <C>
Estate of Edwin J. Schneebeck .................................            3,250             54.62%
  P.O. Box 5245
  Tacoma, WA 98405
 
Don J. Simplot ................................................              900             15.13%
  P.O. Box 27
  Boise, ID 83707
 
Rawley F. Taplett .............................................              900             15.13%
  P.O. Box 2188
  Wenatchee, WA 98801
 
Douglas W. Toms ...............................................              450              7.56%
  2001 Lakewood
  Olympia, WA 98501
 
Dale L. Rasmussen .............................................              450              7.56%
  28833 228th Avenue S.E.
  Kent, WA 98042
                                                                           -----        -----------
 
                                                                           5,950            100.00%
</TABLE>
 
                                       5
<PAGE>
                            OWNERSHIP OF MANAGEMENT
 
    The following table sets forth information as of August 29, 1997, as to the
number of shares of Common Stock and 1993 Series 1 Preferred Stock beneficially
owned by (i) each Director, (ii) the executive officers named in the Summary
Compensation Table and (iii) all Directors and executive officers as a group.
Except as otherwise specified, each named beneficial owner has sole voting and
investment power with respect to the shares set forth opposite his name.
 
<TABLE>
<CAPTION>
                                                                                           AMOUNT AND
                                                                                            NATURE OF
TITLE OF                                                                                   BENEFICIAL   PERCENT OF
CLASS                                  NAME OF BENEFICIAL OWNER                             OWNERSHIP      CLASS
- - - -----------  ----------------------------------------------------------------------------  -----------  -----------
<C>          <S>                                                                           <C>          <C>
  Common     Peter B. Bensinger..........................................................      57,833(1)      *
  Common     Norman L. Bryan.............................................................      13,500(1)      *
  Common     V. Robert Colton............................................................     146,666(2)       2.51%
  Common     Thomas M. Costales..........................................................       6,000(3)      *
  Common     Syed Hussain................................................................      12,000(4)      *
  Common     Paul Mlotok.................................................................      -0-          -0-
  Common     Dale L. Rasmussen...........................................................     163,901(5)       2.74%
  Common     Hans Roehricht..............................................................       5,833(6)      *
  Common     Don J. Simplot..............................................................     283,241(7)       4.72%
  Common     Robert M. Stemmler..........................................................     105,754(8)       1.79%
  Common     Rawley F. Taplett...........................................................     586,732(9)       9.72%
  Common     Douglas W. Toms.............................................................     240,635(10)       4.04%
  Common     All executive officers and directors as a group (12 persons)................   1,434,361           22%
 Preferred   See Ownership of Certain Beneficial Owners--Preferred Stock for ownership of
               1993 Preferred Stock
             All executive officers and directors as a group (12 persons)................       2,700        45.38%
</TABLE>
 
- - - ------------------------
 
 *  Less than 1%
 
 (1) Includes 12,500 shares subject to options under Directors Stock Option
     Plan.
 
 (2) Includes 30,000 shares subject to options under Directors Stock Option
     Plan.
 
 (3) Includes 6,000 shares subject to options under Incentive Stock Option Plan.
 
 (4) Includes 12,000 shares under Incentive Stock Option Plan.
 
 (5) Includes 25,000 shares subject to options under the Incentive Stock Option
     Plan, 52,714 shares subject to options under the 1991 Executive Stock
     Option Plan and 84,970 shares subject to conversion rights under 450 shares
     of 1993 Series 1 Preferred Stock.
 
 (6) Includes 5,833 shares under the Incentive Stock Option Plan.
 
 (7) Includes 17,500 shares subject to options under Directors Stock Option Plan
     and 169,940 shares subject to conversion rights under 900 shares of 1993
     Series 1 Preferred Stock.
 
 (8) Includes 105,000 shares subject to options under the Incentive Stock Option
     Plan.
 
 (9) Includes 50,000 shares subject to options under Directors Stock Option Plan
     and 169,940 shares subject to conversion rights under 900 shares of 1993
     Series 1 Preferred Stock.
 
 (10) Includes 50,000 shares subject to options under Directors Stock Option
      Plan and 84,970 shares subject to conversion rights under 450 shares of
      1993 Series 1 Preferred Stock.
 
                                       6
<PAGE>
                               EXECUTIVE OFFICERS
 
    The following are the executive officers of the Company. Executive officers
are elected by the Board of Directors. For information concerning Common Stock
and 1993 Series 1 Preferred Stock beneficially owned by the executive officers,
see "Ownership of Management."
 
    ROBERT M. STEMMLER. See description under "Election of
Directors--Information About Directors and Nominees for Election."
 
    DALE L. RASMUSSEN, age 47, has been the Senior Vice President and Secretary
since June 1989. He joined the Company in 1984 as Vice President of Finance and
Administration.
 
    SYED HUSSAIN, age 44, has been Vice President of Technology and Automotive
OEM Operations since November 7, 1996. Mr. Hussain joined the Company in 1993
and held various positions with the Company before becoming a Vice President.
 
    HANS J. ROEHRICHT, age 56, has been Vice President of Gaseous Fuel Products
since November 1996. Mr. Roehricht joined the Company in 1990 and held various
positions with the Company before becoming a Vice President.
 
    THOMAS M. COSTALES, age 50, has been the Treasurer and Chief Financial
Officer of the Company since March 1995. From September 1993 until joining the
Company, he was Vice President and Controller of the Omnifax division of Danka
Industries, Inc. He held a similar position with Omnifax's predecessor,
Telautograph Corporation, from 1987 until it was acquired by Danka Industries.
 
                                       7
<PAGE>
                       COMPENSATION OF EXECUTIVE OFFICERS
 
    The following table sets forth certain information regarding compensation
paid during each of the Company's last three fiscal years to the Company's chief
executive officer and the Company's four other most highly compensated executive
officers.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                            LONG TERM
                                                                                          COMPENSATION
                                                                                             AWARDS
                                                                                          -------------
                                                                    ANNUAL COMPENSATION    SECURITIES
                                                                   ---------------------   UNDERLYING
                                                                     SALARY                  OPTIONS       ALL OTHER
NAME AND PRINCIPAL POSITION                           FISCAL YEAR    ($)(1)    BONUS ($)   (IN SHARES)   COMPENSATION
- - - ----------------------------------------------------  -----------  ----------  ---------  -------------  -------------
<S>                                                   <C>          <C>         <C>        <C>            <C>
Robert M. Stemmler .................................        1997   $  197,917  $  62,600       58,535(2)   $  31,181(3)
President and Chief                                         1996      198,000     61,500       20,000(2)      25,878
Executive Officer                                           1995      178,083     53,625       50,000(2)      25,872
 
Dale L. Rasmussen ..................................        1997   $   92,000  $  12,000       12,000(2)   $  16,170(4)
Senior Vice President                                       1996       93,416     13,000       -0-            14,865
and Secretary                                               1995       89,083     15,000       -0-            15,122
 
Syed Hussain .......................................        1997   $  108,333  $  27,900       17,000(2)   $  10,900(5)
Vice President of Technology                                1996       94,385     23,000        3,000(2)       9,400
and Automotive OEM Operations                               1995       83,267     17,000       -0-             9,400
 
Hans Roehricht .....................................        1997   $  109,167  $  24,300       11,035(2)   $  15,793(6)
Vice President of                                           1996      101,538     17,000        2,500(2)      13,990
Gaseous Fuel Products                                       1995       89,725     22,000       -0-            13,706
 
Thomas M. Costales .................................        1997   $  104,188  $  30,600        7,048(2)   $  17,355(7)
Treasurer and Chief                                         1996      101,755     17,300       -0-            15,249
Financial Officer                                           1995       16,667      3,000       12,000(2)       2,000
</TABLE>
 
- - - ------------------------
 
(1) Includes amounts deferred by executive officers pursuant to the IMPCO
    Employee Savings Plan and Deferred Compensation Plan.
 
(2) Options under Incentive Stock Option Plans.
 
(3) Group term life insurance premium of $16,340, Christmas bonus of $1,000,
    automobile allowance of $12,000 and Company's contribution of $2,841
    pursuant to the IMPCO Employee Savings Plan.
 
(4) Group term life insurance premium of $1,073, Company's contribution of
    $2,097 pursuant to the IMPCO Employee Savings Plan, Christmas bonus of
    $1,000 and auto allowance of $12,000.
 
(5) Christmas bonus of $1,000 and automobile allowance of $9,900.
 
(6) Group life insurance premium of $2,303, Company's contribution of $2,590 to
    the IMPCO Employee Savings Plan, Christmas bonus of $1,000 and auto
    allowance of $9,900.
 
(7) Group term life insurance premium of $1,913, Company's contribution of
    $2,442 pursuant to the IMPCO Employee Savings Plan, Christmas bonus of
    $1,000 and automobile allowance of $12,000.
 
                                       8
<PAGE>
                      OPTIONS GRANTED IN FISCAL YEAR 1997
 
    The following table provides information with respect to options granted
during the last fiscal year.
 
<TABLE>
<CAPTION>
                                                                                    INDIVIDUAL GRANTS
                                                                 --------------------------------------------------------
                                                                  NUMBER OF
                                                                   SHARES        % OF TOTAL
                                                                 UNDERLYING    OPTIONS GRANTED    EXERCISE
                                                                   OPTIONS     TO EMPLOYEES IN    PRICE PER   EXPIRATION
NAME                                                             GRANTED(1)      FISCAL YEAR        SHARE        DATE
- - - ---------------------------------------------------------------  -----------  -----------------  -----------  -----------
<S>                                                              <C>          <C>                <C>          <C>
Robert M. Stemmler.............................................      35,000              28%      $    7.63     11/22/06
Robert M. Stemmler.............................................          35               0%           8.75     01/02/07
Robert M. Stemmler.............................................      23,500              16%           6.25     11/07/06
Dale L. Rasmussen..............................................      12,000               8%           6.25     11/07/06
Syed Hussain...................................................       5,000               3%           7.63     11/22/06
Syed Hussain...................................................      12,000               8%           6.25     11/07/06
Hans J. Roehricht..............................................       5,000               3%           7.63     11/22/06
Hans J. Roehricht..............................................          35               0%           8.75     01/02/07
Hans J. Roehricht..............................................       6,000               4%           6.25     11/07/06
Thomas M. Costales.............................................       5,000               3%           7.63     11/22/06
Thomas M. Costales.............................................          48               0%           8.75     01/02/07
Thomas M. Costales.............................................       2,000               1%           6.25     11/07/06
</TABLE>
 
                              POTENTIAL REALIZABLE
                            VALUE AT ASSUMED ANNUAL
                              RATES OF STOCK PRICE
                        APPRECIATION FOR OPTION TERM (2)
 
<TABLE>
<CAPTION>
NAME                                                                                            5%         10%
- - - ------------------------------------------------------------------------------------------  ----------  ----------
<S>                                                                                         <C>         <C>
Robert M. Stemmler........................................................................  $  260,499  $  660,181
Dale L. Rasmussen.........................................................................      47,164     119,533
Thomas M. Costales........................................................................      31,115      81,389
Syed Hussain..............................................................................      71,156     180,333
Hans J. Roehricht.........................................................................      47,766     121,053
</TABLE>
 
- - - ------------------------
 
(1) Material terms of options granted under the 1996 Incentive Stock Option Plan
    are as follows: Options are granted at the fair market value of the Common
    Stock on the date of grant and vest cumulatively at the rate of 40% after
    the first two years following the date of the grant and 20% each year
    thereafter so that the employee is 100% vested after five years. However, if
    employment terminates due to death or disability, retirement at or after age
    62, or termination without cause, then options vest at the rate of 25% for
    each full calendar year of employment. Options may be exercised only while
    an optionee is employed by the Company, or within three months following
    termination of employment. However, if termination results from death or
    disability, options may be exercised within one year of the termination
    date. In no event may options be exercised more than ten years after date of
    grant.
 
(2) Based on ten-year option term and annual compounding at rates shown. The
    dollar amounts under these columns are the results of calculations at the 5%
    and 10% rates set by the Securities and Exchange Commission and, therefore,
    are not intended to forecast possible future appreciation, if any, of the
    Common Stock. No gain to optionees is possible without stock price
    appreciation, which will benefit all stockholders on a commensurate basis.
 
                                       9
<PAGE>
                AGGREGATED OPTION EXERCISES IN FISCAL YEAR 1997
                                      AND
                         FISCAL YEAR-END OPTION VALUES
 
    The following table provides information with respect to exercise of options
during the last fiscal year and value of unexercised options at the end of
fiscal year 1997.
 
<TABLE>
<CAPTION>
                                                                                       NUMBER OF
                                                                                      UNEXERCISED
                                                                                      OPTIONS (IN     VALUE OF UNEXERCISED
                                                                                        SHARES)       IN-THE-MONEY OPTIONS
                                                                                       AT FISCAL           AT FISCAL
                                                                                       YEAR-END           YEAR-END(1)
                                                    SHARES                         -----------------  --------------------
                                                  ACQUIRED ON    VALUE REALIZED      EXERCISABLE/         EXERCISABLE/
NAME                                             EXERCISE (#)          ($)           UNEXERCISABLE       UNEXERCISABLE
- - - -----------------------------------------------  -------------  -----------------  -----------------  --------------------
<S>                                              <C>            <C>                <C>                <C>
Robert M. Stemmler.............................       -0-              -0-           82,500/116,035    $   69,025/162,136
Dale L. Rasmussen..............................       -0-              -0-            77,714/12,000    $   467,554/40,560
Thomas M. Costales.............................       -0-              -0-             6,000/13,048    $     3,780/20,582
Syed Hussain...................................       -0-              -0-             9,000/23,000    $    20,880/61,270
Hans J. Roehricht..............................       -0-              -0-             5,833/13,535    $    21,174/33,436
</TABLE>
 
- - - ------------------------
 
(1) Calculated by determining the difference between the fair market value of
    the Common Stock underlying the options on April 30, 1997 ($9.63) and the
    exercise price of the options.
 
                              EMPLOYMENT AGREEMENT
 
    The Company entered into an Employment Agreement with Robert M. Stemmler
which provides for two consecutive twelve month periods of employment as the
President and Chief Executive Officer, commencing April 1, 1997. It is subject
to certain termination events, which include Mr. Stemmler's resignation and the
Company's right to terminate him with or without cause upon payment of lump sum
equal to 100% in the first term and 75% in the second term, respectively, of
base salary, plus certain incentive compensation and payment of benefits for a
period following termination. The Employment Agreement requires payment of an
annual base salary of $230,000, annual payment of incentive compensation under
the Company's Bonus Incentive Plan and options to purchase 150,000 shares of
Common Stock under the Company's Incentive Stock Option Plans and an additional
50,000 shares of Common Stock if the trading price of the Common Stock reaches a
targeted price during fiscal year 1998.
 
                                       10
<PAGE>
                         COMPENSATION COMMITTEE REPORT
                           ON EXECUTIVE COMPENSATION
 
    The following report on executive compensation is furnished by the Board of
Directors. In fiscal year 1997, as in prior years, the nonmanagement members of
the Board of Directors determined the compensation to be paid to the executive
officers. An Employment Agreement with Robert M. Stemmler was in effect during
the fiscal year. See "Employment Agreement."
 
                         FISCAL YEAR 1997 COMPENSATION
                            COMPENSATION PHILOSOPHY
 
    Compensation of the executive officers is designed to link compensation
directly to the Company's growth and financial performance. Compensation
consists of base compensation, a Bonus Incentive Plan and options under
Incentive Stock Option Plans. The objective of these three elements, taken
together, is to provide reasonable base compensation and to retain, recognize
and reward superior performance. The compensation philosophy also ensures that
the Company provides a comprehensive compensation package that is competitive in
the marketplace.
 
                              BONUS INCENTIVE PLAN
 
    The Company has a Bonus Incentive Plan which includes a bonus incentive plan
for the chief executive officer and a bonus incentive pool for the executive
officers and staff. These bonus plans have two components: A "revenue portion"
which is based upon the percentage increase of the Company's gross revenues to
the extent gross revenues exceed 110% of the prior fiscal year gross revenues,
and an "earnings before interest and taxes (EBIT) portion" which is based upon
the incremental growth in EBIT over the prior fiscal year. The minimum bonus
payable to the chief executive officer is 1.5% of the current fiscal year's EBIT
and the maximum bonus is 75% of current salary. The minimum bonus pool for the
other executive officers and staff is 4% of the current fiscal year's EBIT and
the maximum bonus pool is 50% of their current aggregate salaries.
 
                           DEFERRED COMPENSATION PLAN
 
    The Board of Directors has adopted a Deferred Compensation Plan to provide a
select group of management or highly compensated employees and Directors with
the opportunity to participate in a deferred compensation program. Under the
program, participants may defer up to 100% of their base compensation and
bonuses earned. The Company is required to make certain matching contributions,
a portion of which is to be in the form of options to purchase the Company's
Common Stock granted under the 1996 Incentive Stock Option Plan and a portion in
shares of the Company's Common Stock, subject to vesting provisions. The options
are to be granted on the first day of each calendar year during which the
Company's Common Stock is traded and the exercise price for such options shall
be equal to the closing price on the Nasdaq National Market or such stock
exchange on the first trading day of such calendar year. The program is not
qualified under Section 401 of the Internal Revenue Code. The Company will pay
participants in the program, upon retirement or termination of employment, an
amount equal to the amount of deferred compensation plus investment returns and
vested shares of the Company's Common Stock.
 
                                CEO COMPENSATION
 
    Robert M. Stemmler served as chief executive officer pursuant to an
Employment Agreement which had a term ending March 31, 1997. Pursuant to that
Employment Agreement, he was paid a base salary at an annual rate of $190,000.
Effective April 1, 1997, the Company entered into a new Employment Agreement
pursuant to which he is being paid a base salary at an annual rate of $230,000.
 
                                       11
<PAGE>
    In addition to the base salary, Mr. Stemmler is eligible for an annual cash
bonus under the Bonus Incentive Plan during each fiscal year. Mr. Stemmler's
bonus for fiscal year 1997 was the minimum bonus payable under the Bonus
Incentive Plan.
 
    As longer term compensation, options were granted to purchase 58,535 shares
of Common Stock under the Company's Incentive Stock Option Plans. In addition,
under the April 1, 1997 Employment Agreement, Mr. Stemmler will be granted
options to purchase 150,000 shares of Common Stock under the Company's Incentive
Stock Option Plans and to purchase an additional 50,000 shares of Common Stock
if the trading price of the Common Stock reaches a targeted price during fiscal
year 1998. The options are intended to induce Mr. Stemmler's continued
employment, allow him to participate in the ownership of the Company, and
provide further long-term incentive to advance the interest of the Company and
increase the value of the Company's Common Stock.
 
                            OTHER EXECUTIVE OFFICERS
 
    In reviewing and approving base salaries for the executive officers, the
Compensation Committee relies on independent industry surveys to assess the
Company's salary competitiveness and salary range for each position. Base salary
is based upon individual performance, experience, competitive pay practices and
level of responsibilities. Base salaries in fiscal year 1997 reflected the
Committee's determination of compensation levels required to remain competitive,
given each executive officer's performance, the Company's performance and the
competitive environment for executive talent. The purpose of stock options is to
induce selected, key employees of the Company to remain employed with the
Company, to participate in the ownership of the Company, to advance the
interests of the Company and to increase the value of the Company's Common
Stock. In fiscal year 1997, the executive officers' bonuses under the Bonus
Incentive Plan were at the minimum level payable under the Plan.
 
    The foregoing report was made by the members of the Compensation Committee.
 
                                          Douglas W. Toms, Chair
 
                                          Edwin J. Schneebeck
 
                                          Don J. Simplot
 
                                          Rawley F. Taplett
 
                                       12
<PAGE>
                         COMPARATIVE STOCK PERFORMANCE
 
    The graph below compares the cumulative total stockholder return on the
Company's Common Stock for the last five fiscal years with the cumulative total
return of the CRSP Total Return Index for The Nasdaq Stock Market Index and the
Nasdaq Trucking and Transportation Stock Index over the same period (assuming
the investment of $100 and reinvestment of all dividends).
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
 VALUE AT APRIL
       30           IMPCO     NASDAQ    NASDAQ TRUCKING TRANSPORTATION
<S>               <C>        <C>        <C>
1992                  100.0      100.0                           100.0
1993                  136.7      120.4                           112.1
1994                  283.3      128.0                           126.9
1995                  226.7      148.8                           127.0
1996                  223.3      212.1                           150.6
1997                  206.7      224.5                           147.4
</TABLE>
 
<TABLE>
<CAPTION>
 VALUE AT                              NASDAQ TRUCKING
 APRIL 30       IMPCO       NASDAQ     TRANSPORTATION
- - - -----------  -----------  -----------  ---------------
<S>          <C>          <C>          <C>
      1992        100.0        100.0          100.0
      1993        136.7        120.4          112.1
      1994        283.3        128.0          126.9
      1995        226.7        148.8          127.0
      1996        223.3        212.1          150.6
      1997        206.7        224.5          147.4
</TABLE>
 
               II.  APPROVAL OF 1997 INCENTIVE STOCK OPTION PLAN
 
    The Board of Directors adopted the 1997 Incentive Stock Option Plan (the
"Plan") subject to stockholder approval. It is similar to the 1989 and 1996
Incentive Stock Option Plans and was adopted because of the small number of
options remaining available for grant under those two plans. The Board of
Directors believes that use of stock options is desirable as an effective means
of securing to the Company and its stockholders the advantages of the incentive
inherent in stock ownership by participating employees, whose judgment,
initiative and efforts are important to the Company for the successful conduct
of its business. Stockholder approval of the Plan will enable the Company to
continue incentive stock option programs for employees of the Company and
provide the flexibility to make stock-based incentive compensation awards.
 
    The Plan is set forth in full as Exhibit A to this Proxy Statement and
reference is made thereto for a complete statement of its terms and provisions.
The principal features of the Plan are discussed below.
 
                                       13
<PAGE>
DESCRIPTION OF THE PLAN
 
    The Plan is administered by the Board of Directors, which has the authority
to appoint a Stock Option Committee consisting of not less than three Directors
and delegate administration to the Committee. It determines the employees to be
granted options and the amount of stock options to be awarded to employees.
Employees, including officers, of the Company and its subsidiaries are eligible
to receive options. The total number of shares of Common Stock which may be
issued pursuant to options under the Plan is 750,000. As of the date of this
Proxy Statement, options for 705,000 shares under the Plan have been granted,
subject to approval of the Plan by the stockholders.
 
    The Plan provides for options which qualify as "incentive stock options" as
defined under the Internal Revenue Code. The option price must be at least equal
to the fair market value of the Company's Common Stock on the date of grant.
Options are not assignable except by will or the laws of decent and
distribution. Options vest and are exercisable cumulatively (i) as to 40% of the
total number of shares initially subject to the option, 24 months following the
date of grant of such option, and (ii) as to 20% of the total number of shares
initially subject the option, once during each 12-month period thereafter, so
that 60 months following the date of grant such options are fully vested and
exercisable. An optionee may exercise an option only while an employee of the
Company or one of its subsidiaries, or within three months following the
termination of such employment. If an optionee becomes disabled or dies while in
the employ of the Company or a subsidiary, the option may be exercised within
one year of the optionee's death or termination due to disability. In no event
may an option be exercised more than ten years after the date of grant. The
option price may be paid in cash or by the surrender of shares of the Company's
Common Stock owned by the employee exercising the option and having a fair
market value on the date of exercise equal to the option price, or in any
combination of cash and shares equal to the option price.
 
    The Plan does not limit the aggregate number of shares which may be optioned
to any one employee or in any single year. However, the maximum value of grants
that vest in a calendar year is limited to $100,000 for each employee. The Plan
provides for appropriate adjustment of the number of shares available for
issuance under the Plan, including the number of shares subject to outstanding
options and the purchase price thereof, in the event of reorganizations, stock
splits, combinations of shares, stock dividends or other recapitalizations of
the Company.
 
    When an option expires or terminates for any reason, the number of
unexercised or forfeited shares subject to the option may again become available
for grant under the Plan. The Plan will terminate on May 22, 2007. The Board of
Directors may at any time amend, suspend or discontinue the Plan, except that no
amendment may be made without the approval of the stockholders which would
increase the number of shares subject to the Plan, materially change the
designation of the class of employees eligible to receive options, remove the
administration of the Plan from the Board of Directors or the Stock Option
Committee or materially increase the benefits accruing to participants under the
Plan.
 
FEDERAL INCOME TAX EFFECTS
 
    An optionee realizes no taxable income upon either a grant or the exercise
of an option. If the optionee makes a disposition of the stock acquired upon
exercise of the option within two years from the date of grant or within one
year from the date of exercise (disqualifying disposition), the difference
between the option price and the fair market value on the date of exercise (not
to exceed the gain recognized on the sale) will be taxed at ordinary income
rates and any gain in excess of such amount will be a long-term or short-term
capital gain, depending on the length of time the stock was held by the
optionee. If the optionee sells the stock acquired upon exercise of the option
more than one year after the date of exercise and more than two years after the
date of grant, the difference between the option price and the sales price will
be taxed as long-term capital gain or loss. The spread between the option price
and the fair market value of the stock on the date of exercise will be
classified as an item of tax preference for purposes of computing the
alternative minimum tax.
 
                                       14
<PAGE>
    The Company has no tax deduction with respect to the grant or exercise of an
option or the sale of stock acquired pursuant to an option under the 1997 Plan,
except to the extent that an employee recognizes ordinary income upon a
disqualifying disposition of such stock.
 
APPROVAL OF THE PLAN
 
    Approval of the Plan requires the affirmative vote of the holders of the
Common Stock and 1993 Series 1 Preferred Stock representing a majority of the
voting rights of the stockholders present in person or by proxy at the Annual
Meeting. Broker non-votes will not be counted for purposes of determining
whether the Plan has been approved or disapproved. Abstentions will be counted
in determining the number of votes required to approve or disapprove the Plan.
Accordingly, an abstention by a stockholder voting in person or by proxy has the
legal effect as voting against approval of the Plan.
 
                 THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS
          A VOTE FOR APPROVAL OF THE 1997 INCENTIVE STOCK OPTION PLAN
 
                III.  APPROVAL OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    Ernst & Young LLP has audited the Company's financial statements for the
fiscal years ended April 30, 1988 through 1997.
 
    The Board of Directors has selected Ernst & Young LLP as independent public
accountants for the Company for the fiscal year ending April 30, 1998. Although
not required to be voted upon by the stockholders, the Board of Directors deems
it appropriate for the selection to be submitted for ratification by the
stockholders. The persons named in the accompanying proxy will vote the Common
Stock represented by the proxy for ratification of the selection of Ernst &
Young LLP, unless a contrary choice has been specified in the proxy. If the
stockholders do not ratify the selection of Ernst & Young LLP by a majority
vote, the selection of independent public accountants will be considered by the
Board of Directors, although the Board of Directors would not be required to
select different independent public accountants for the Company. The Board of
Directors retains the power to select another firm as independent public
accountants for the Company to replace a firm whose selection was ratified by
the stockholders in the event the Board of Directors determines that the best
interest of the Company warrants a change of its independent public accountants.
A representative of Ernst & Young LLP is expected to be present at the Annual
Meeting and will have the opportunity to make a statement if he or she desires
to do so. Such representative is expected to be available to respond to
appropriate questions.
 
    THE BOARD OF DIRECTORS HAS UNANIMOUSLY APPROVED THE APPOINTMENT OF ERNST &
YOUNG LLP AS INDEPENDENT PUBLIC ACCOUNTANTS FOR THE COMPANY FOR FISCAL YEAR 1998
AND RECOMMENDS A VOTE "FOR" APPROVAL OF THE APPOINTMENT.
 
            SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
    Section 16(a) of the Securities Exchange Act of 1934 requires the Company's
directors and executive officers, and persons who own more than 10% of the
Company's Common Stock to file with the Securities and Exchange Commission
("SEC") initial reports of ownership and reports of changes in ownership of
Common Stock and other equity securities of the Company. Officers, directors and
greater than 10% stockholders are required by SEC regulation to furnish the
Company with copies of all Section 16(a) reports they file. To the Company's
knowledge, based solely on review of the copies of such reports furnished to the
Company or advice that no filings were required, during fiscal year 1997 all
officers, directors and greater than 10% beneficial owners were complied with
the Section 16(a) filing requirements, except one Form 4 was filed late by each
of Rawley F. Taplett (two transactions) and Dale L. Rasmussen (one transaction),
and two Form 4's were filed late by each of Robert M. Stemmler (one
transaction), Thomas M. Costales (one transaction) and Syed Hussain (one
transaction).
 
                                       15
<PAGE>
                           PROPOSALS OF STOCKHOLDERS
 
    In order for proposals of stockholders to be included in the proxy materials
for presentation at the 1998 Annual Meeting of Stockholders, such proposals must
be received by the Corporate Secretary no later than June 12, 1998.
 
                               OTHER INFORMATION
 
    The 1997 Annual Report of the Company for the fiscal year ended April 30,
1997 was mailed to stockholders prior to or together with the mailing of this
Proxy Statement. Stockholders who did not receive a copy of the 1997 Annual
Report with their Proxy Statement may obtain a copy by writing to or calling
Dale L. Rasmussen, Secretary, IMPCO Technologies, Inc., 708 Industry Drive,
Seattle, Washington 98188; telephone number (206) 575-1594.
 
                                 OTHER BUSINESS
 
    As of the date of this Proxy Statement management knows of no other business
which will be presented for action at the meeting. If any other business
requiring a vote of the stockholders should come before the meeting, the persons
named in the enclosed form of proxy will vote or refrain from voting in
accordance with their best judgment.
 
                                          By Order of the Board of Directors,
 
                                          Dale L. Rasmussen
 
                                          SECRETARY
 
Cerritos, California
 
October 10, 1997
 
                                       16
<PAGE>
                                AIRSENSORS, INC.
                        1997 INCENTIVE STOCK OPTION PLAN
 
    PURPOSE OF THE PLAN.  The purpose of this Incentive Stock Option Plan is to
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to the Employees of the Company
and to promote the success of the Company's business. It is intended that
options issued pursuant to this Incentive Stock Option Plan constitute
"incentive stock options" within the meaning of Section 422 of the Code.
 
     1. DEFINITIONS.  As used herein, the following definitions shall apply:
 
        "BOARD" means the Board of Directors of the Company.
 
        "CODE" means the Internal Revenue Code of 1986, as amended.
 
        "COMMON STOCK" means the Company's common stock, par value $.001 per
    share.
 
        "COMPANY" means AirSensors, Inc., a Delaware corporation.
 
        "COMMITTEE" means the Committee appointed by the Board in accordance
    with SECTION 3(A) of the Plan.
 
        "EMPLOYEE" means any person employed by the Company or any Subsidiary of
    the Company which now exists or is hereafter organized or is acquired by the
    Company.
 
        "IMPCO" means IMPCO Technologies, Inc., a Delaware corporation.
 
        "OPTION" means a stock option granted pursuant to the Plan.
 
        "OPTIONEE" means a person who holds an Option.
 
        "PLAN" means this 1997 Incentive Stock Option Plan.
 
        "SUBSIDIARY" means a corporation of which more than 50% of the voting
    shares are held directly by the Company or directly and indirectly by the
    Company and one or more Subsidiaries, whether or not such corporation now
    exists or is hereafter organized or acquired by the Company or a Subsidiary.
 
     2. STOCK SUBJECT TO THE PLAN.  Subject to SECTION 10, the maximum number of
shares which may be optioned and sold under the Plan is 750,000 shares of Common
Stock.
 
    If an Option should expire or become unexercisable in whole or in part for
any reason, the remaining shares of Common Stock which were subject to the
Option shall, unless the Plan shall have been terminated, become available for
other Options under the Plan.
 
     3. ADMINISTRATION OF THE PLAN.
 
        (a)  PROCEDURE.  The Plan shall be administered by the Board or, as
determined by the Board, a Committee appointed by the Board. The Committee shall
consist of not less than three members of the Board and shall administer the
Plan subject to such terms and conditions as the Board may prescribe. From time
to time the Board may increase the size of the Committee and appoint additional
members, remove members (with or without cause) and appoint new members in
substitution therefor, fill vacancies however caused, or remove all members of
the Committee and thereafter directly administer the Plan. The Committee shall
select one of its members as chairman and shall hold meetings at such times and
places as it may determine.
 
    Members of the Board who are either eligible for Options or have been
granted Options may vote on any matters affecting the administration of the Plan
or the grant of any Options pursuant to the Plan, except that no such member
shall act upon the granting of an Option to himself, but any such member may be
counted in determining the existence of a quorum at any meeting of the Board or
the Committee during which action is taken with respect to the granting of
Options to him.
 
    As used in the Plan and in any Option, the term "Board" shall refer to the
Board, or the Committee if a Committee has been appointed.
<PAGE>
        (b)  POWERS OF THE BOARD/COMMITTEE.  Subject to the provisions of the
Plan, the Board shall have the authority, in its discretion: (i) to determine,
upon review of relevant information, the fair market value of the Common Stock;
(ii) to determine the exercise price per share of Options to be granted, which
price shall in no event be less than the fair market value per share of Common
Stock on the date of grant of the Option, or 110% of such fair market value in
the case of any Option granted to an Employee who, immediately before the grant
of such Option, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or of its parent or
Subsidiaries; (iii) to determine the Employees to whom, and the time or times at
which, Options shall be granted and the number of shares to be represented by
each Option; (iv) to interpret the Plan; (v) to prescribe, amend and rescind
rules and regulations relating to the Plan; (vi) except as otherwise provided in
this Plan, to determine the terms and provisions of each Option granted under
the Plan (which need not be identical) and, with the consent of the holder
thereof, modify or amend each Option; (vii) to accelerate the vesting or
exercise date of any Option; (viii) to authorize any person to execute on behalf
of the Company any instrument required to effectuate the grant of an Option
granted by the Board; and (ix) to make all other determinations deemed necessary
or advisable for the administration of the Plan.
 
    All decisions, determinations and interpretations of the Board shall be
final and binding on all Optionees and any other holders of any Options granted
under the Plan. No member of the Board or the Committee shall be liable for any
action or determination made in good faith with respect to the Plan or any
Option. If the Board has appointed a Committee, the actions of the Committee
shall be reported to the Board.
 
     4. ELIGIBILITY.  Options may be granted only to Employees. An Employee who
has been granted an Option may, if he or she is otherwise eligible, be granted
an additional Option or Options.
 
    No Option may be granted to an Optionee under the Plan if, as the result of
such grant, the aggregate fair market value (determined as of the time each
Option is granted) of the shares of Common Stock for which such Optionee has
been granted options which are exercisable for the first time by such Optionee
during any calendar year (under all incentive stock option plans of the Company)
would exceed $100,000.
 
    The Plan shall not confer upon any Optionee any right with respect to
continuation of employment by the Company, nor shall it interfere in any way
with his or her right or the Company's right to terminate his or her employment
at any time.
 
     5. TERM OF PLAN.  Subject to SECTION 16, the Plan shall become effective
upon its adoption by the Board. It shall continue in effect for a term of ten
(10) years from the effective date unless sooner terminated under SECTION 12.
 
     6. TERM OF OPTION.  Except as otherwise provided in SECTIONS 8 and 10, the
term of each Option shall be for ten (10) years from the date of grant thereof
unless otherwise determined by the Board when granting an Option and set forth
in an Optionee's option agreement, except that the term of each Option granted
to an employee who, immediately before such Option is granted, owns stock
representing more than ten percent (10%) of the voting power of all classes of
stock of the Company or of its parent or Subsidiaries shall be for not more than
five (5) years from the date of grant thereof. Subject to the foregoing, the
term of each Option shall be determined by the Board.
 
        7.  OPTION PRICE AND CONSIDERATION.
 
        (a) The price for the shares of Common Stock to be issued pursuant to an
Option shall be such price as is determined by the Board, but shall in no event
be less than the fair market value per share of the Common Stock on the date of
grant of the Option. In the case of an Option granted to an Employee who,
immediately before the grant of such Option, owns stock representing more than
ten percent (10%) of the voting power of all classes of stock of the Company or
of its parent or Subsidiaries, the price shall be not less than 110% of the fair
market value per share of such Common Stock. The fair market value shall be
determined by the Board in its discretion; PROVIDED, that if there is a public
market for the Common Stock,
 
                                       2
<PAGE>
the fair market value shall be (i) the closing sale price as of the date of
grant on the Nasdaq National Market or, if the Common Stock is traded on a stock
exchange, the closing sale price as of the date of grant on the principal stock
exchange on which such stock is traded, and (ii) the mean of the reported
closing bid and ask prices for the Common Stock as of the date of grant if the
Common Stock is not traded as provided in clause (i).
 
        (b) The consideration to be paid for the Common Stock to be issued upon
exercise of an Option, and the method of payment, shall be determined by the
Board and may consist of cash or any other consideration and method of payment
for the issuance of common stock which is permitted under the Delaware
Corporation Law and complies with other applicable laws and regulations
(including but not limited to, applicable federal tax and federal and state
securities laws and regulations).
 
     8. VESTING AND EXERCISE OF OPTIONS.
 
        (a)  VESTING AND EXERCISE OF OPTIONS WHILE AN EMPLOYEE.  Unless
otherwise determined by the Board when granting an Option and set forth in an
Optionee's option agreement, each Option held by an Optionee shall vest and
shall be exercisable at any time so long as such Optionee continues to be an
Employee, cumulatively, (i) as to forty percent (40%) of the total number of
shares subject to such Option, twenty-four (24) months following the date of
grant of such Option, and (ii) as to twenty percent (20%) of the total number of
shares subject to such Option, once during each twelve (12) month period
commencing on the third and each subsequent anniversary date of the grant of
such Option, so that sixty (60) months following the date of the grant of each
Option one hundred percent (100%) of the shares subject to such Option may be
purchased by exercise of the Option.
 
        (b)  VESTING OF OPTIONS UPON RETIREMENT.  Unless otherwise determined by
the Board when granting an Option and set forth in an Optionee's option
agreement, all Options held by an Optionee who retires at age 62 or older and
was continuously an Employee for five (5) years immediately preceding retirement
which are not vested as provided in SECTION 8(A) shall immediately vest upon
such Optionee's retirement and be exercisable as provided in SECTION 8(C).
 
        (c)  EXERCISE OF OPTIONS FOLLOWING TERMINATION OF STATUS AS AN
EMPLOYEE.  Following termination of employment as an Employee, an Optionee may
exercise an Option to the extent that he or she was entitled to exercise the
Option at the date of such termination as provided in SECTION 8(A) and (B) as
follows:
 
             (i) Except in the case of death or disability (within the meaning
of Section 22(e)(3) of the Code), within thirty (30) days following the date of
termination of employment, except that the Board may extend the period for such
exercise up to a period not exceeding three (3) months following the date of
termination;
 
             (ii) If an Optionee dies while an Employee, the period of time
within which the Board may permit exercise of Options after the date of death
may be up to one (1) year, and such Options may be exercised by the Optionee's
estate or by a person who acquired the right to exercise the Option by bequest
or inheritance or by reason of the death of an Optionee; and
 
            (iii) If an Optionee becomes disabled while an Employee, the period
of time within which the Board may permit exercise of Options after the date of
termination as an Employee of the Company may be up to one (1) year.
 
    Options which are not vested as provided in SECTION 8(A) and (B) or which
are vested but not exercised as required by SECTION 8(C) shall terminate.
 
        (d)  SPECIAL LIMITATION ON EXERCISE.  Notwithstanding SECTIONS 8(A) and
(B), in no event shall an Option be exercisable if such Option, together with
all other incentive stock options under this or any other incentive stock option
plan which are exercisable for the first time during any calendar year, are for
the
 
                                       3
<PAGE>
purchase of Common Stock with an aggregate fair market value (determined as of
the date of grant of each such option) in excess of $100,000.
 
        (e)  PROCEDURE FOR EXERCISE; RIGHTS AS STOCKHOLDER.  An Option shall be
deemed to be exercised when written notice of such exercise has been given to
the Company in accordance with the terms of the Option by the person entitled to
exercise the Option and full payment for the shares of Common Stock with respect
to which the Option is exercised has been received by the Company. An Option may
not be exercised for a fraction of a share of Common Stock.
 
    Until the issuance (as evidenced by the appropriate entry on the books of
the Company or of a duly authorized transfer agent of the Company) of the stock
certificate evidencing such shares of Common Stock, no right to vote or receive
dividends or any other rights as a stockholder shall exist with respect to such
Common Stock, notwithstanding the exercise of the Option. No adjustment will be
made for a dividend or other right for which the record date is prior to the
date the stock certificate is issued, except as provided in SECTION 10.
 
    Exercise of an Option shall result in a decrease in the number of shares of
Common Stock which thereafter may be available, both for purposes of the Plan
and for purchase under the Option, by the number of shares of Common Stock as to
which the Option is exercised.
 
     9. NON-TRANSFERABILITY OF OPTIONS.  An Option may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.
 
    10. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION OR MERGER.  Subject to any
required action by the stockholders of the Company, the number of shares of
Common Stock covered by each outstanding Option, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options have yet been granted or which have been returned to the Plan
upon cancellation of an Option, as well as the price per share of Common Stock
covered by each such outstanding Option, shall be proportionately adjusted for
any increase or decrease in the number of issued shares of Common Stock
resulting from a stock split or the payment of a stock dividend (but only on the
Common Stock) or any other increase or decrease in the number of such shares of
Common Stock affected without receipt of consideration by the Company; PROVIDED,
that conversion of any convertible securities of the Company shall not be deemed
to have been "affected without receipt of consideration." Such adjustment shall
be made by the Board, whose determination shall be final, binding and
conclusive. Except as expressly provided herein, no issue by the Company of
shares of stock of any class, or securities convertible into shares of stock of
any class, shall affect, and no adjustment by reason thereof shall be made with
respect to, the number or price of shares of Common Stock subject to an Option.
 
    In the event of (i) the dissolution or liquidation of the Company, (ii) the
sale of substantially all of the assets of the Company or of IMPCO, or (iii) the
merger, consolidation or other reorganization of the Company with or into
another corporation, the Options will terminate unless otherwise provided by the
Board. The Board may, in the exercise of its sole discretion in such instances,
declare that any Option shall terminate as of a date fixed by the Board or may
give all or certain Optionees the right to exercise their Options as to all or
any part of the shares of Common Stock which are subject to such Options,
including shares of Common Stock as to which Options would not otherwise be
exercisable.
 
    In the event of a "change of control" of the Company, the Board may, in the
exercise of its sole discretion, give all or certain Optionees the right to
exercise their Options as to all or any part of the shares of Common Stock which
are subject to such Options, including shares of Common Stock as to which
Options would not otherwise be exercisable. For purposes of this paragraph,
"change of control" shall mean (i) within the meaning of Section 13(d) of the
Securities Exchange Act of 1934, any person or group becomes a beneficial owner,
directly or indirectly, of the Company's securities representing 50% or more of
the total voting power of the Company's then outstanding securities, (ii) the
stockholders of the
 
                                       4
<PAGE>
Company approve the dissolution or liquidation of the Company, (iii) the
stockholders of the Company approve an agreement to merge or consolidate, or
otherwise reorganize, whether into one or more entities, as a result of which
less than 50% of the total voting power of securities of the surviving or
resulting entity are, or are to be, owned by former stockholders of the Company,
or (iv) the stockholders or directors of the Company or IMPCO approve,
respectively, the sale of seventy-five percent (75%) or more of the Company's or
IMPCO's business and/or assets.
 
    No Option granted pursuant to this Plan shall be adjusted by the Board
pursuant to this SECTION 10 in a manner that causes the Option to fail to
continue to qualify as an incentive stock option within the meaning of Section
422 of the Code.
 
    The grant of an Option pursuant to the Plan shall not affect in any way the
right or power of the Company to make adjustments, reclassifications,
reorganizations or changes of its capital or business structure or to merge or
to consolidate or to dissolve, liquidate or sell, or transfer all or any part of
its business or assets.
 
    11. TIME OF GRANTING OPTIONS.  The date of grant of an Option shall, for all
purposes, be the date on which the Board makes the determination granting such
Option. Notice of the determination shall be given to each Employee to whom an
Option is so granted within a reasonable time after the date of such grant.
 
    12. AMENDMENT AND TERMINATION OF THE PLAN.
 
        (a)  AMENDMENT AND TERMINATION.  The Board may amend or terminate the
Plan from time to time in such respects as the Board may deem advisable, except
that, without approval of the holders of a majority of the outstanding shares of
the Common Stock, no such revision or amendment shall:
 
             (i) Increase the number of shares of Common Stock subject to the
Plan other than in connection with an adjustment under SECTION 10 of the Plan;
 
             (ii) materially change the designation of the class of employees
eligible to be granted Options;
 
            (iii) remove the administration of the Plan from the Board; or
 
             (iv) materially increase the benefits accruing to participants
under the Plan.
 
        (b)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or
termination of the Plan shall not affect Options granted prior to such amendment
or termination and such Options shall remain in full force and effect as if this
Plan had not been amended or terminated.
 
    13. CONDITIONS UPON ISSUANCE OF SHARES.  Shares of Common Stock shall not be
issued with respect to an Option granted under the Plan unless the exercise of
such Option and the issuance and delivery of such Shares pursuant thereto shall
comply with all relevant provisions of law, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange or market upon which the Common Stock may then be listed
or quoted, and shall be further subject to the approval of counsel for the
Company with respect to such compliance.
 
    As a condition to the exercise of an Option, the Company may require the
person exercising such Option to represent and warrant at the time of any such
exercise that the shares of Common Stock are being purchased only for investment
and without any present intention to sell or distribute such Common Stock if, in
the opinion of counsel for the Company, such a representation is required by any
of the aforementioned relevant provisions of law.
 
    14. RESERVATION OF SHARES.  The Company, during the term of this Plan, will
at all times reserve and keep available such number of shares of Common Stock as
shall be sufficient to satisfy the requirements of the Plan.
 
                                       5
<PAGE>
    Inability of the Company to obtain from any regulatory body having
jurisdiction authority deemed by the Company's counsel to be necessary to the
lawful issuance and sale of any shares of Common Stock hereunder shall relieve
the Company of any liability in respect of the non-issuance or sale of such
shares as to which such requisite authority shall not have been obtained.
 
    15. OPTION AGREEMENTS.  Options shall be evidenced by written option
agreements in such form as the Board shall approve.
 
    16. STOCKHOLDER APPROVAL.  Effectiveness of the Plan shall be subject to
approval within twelve (12) months following the Board of Directors' adoption of
this Plan by the holders of the Company's outstanding Common Stock.
 
Adopted by the Executive Committee on May 22, 1997.
 
Approved by the stockholders on         , 1997.
 
                                       6
<PAGE>



                        IMPCO Technologies, Inc.
          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

   The undersigned hereby appoints Peter B. Bensinger, Dale L. Rasmussen and 
Robert M. Stemmler, and each of them, as proxies, with power of substitution, 
to vote for and on behalf of the undersigned all of the shares of Common 
Stock of IMPCO Technologies, Inc. that the undersigned would be entitled to 
vote if personally present at the Annual Meeting of Stockholders to be held on 
November 13, 1997, and at any adjournment thereof, as follows:

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                                                             See Reverse
                                                                Side
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                          --)  FOLD AND DETACH HERE  (--



<PAGE>


THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED ON THIS
PROXY CARD. MANAGEMENT RECOMMENDS A VOTE FOR ALL NOMINEES AND FOR THE MATTERS
DESIGNATED ON THIS PROXY CARD; IF NO SPECIFICATION IS MADE, A VOTE FOR ALL OF
SAID NOMINEES AND FOR ALL SUCH MATTERS WILL BE ENTERED.


                                                          PLEASE MARK 
                                                         YOUR VOTES AS    /X/
                                                          INDICATED IN 
                                                          THIS EXAMPLE


                           FOR All Nominees listed     WITHHOLD AUTHORITY to
                           (except as indicated to     vote for all Nominees
                           the contrary)               as indicated
(1) Election of Directors:          / /                         / /

INSTRUCTION--TO WITHHOLD AUTHORITY TO VOTE FOR ANY NOMINEE, PRINT THAT NOMINEE'S
NAME IN THE FOLLOWING SPACE:


- - - -------------------------------------------------------------------------------
   Peter B. Bensinger          Rawley F. Taplett          Douglas W. Toms


                                                      FOR    AGAINST    ABSTAIN

(2) FOR APPROVAL OF THE 1997 INCENTIVE STOCK 
    OPTION PLAN                                       / /      / /        / /

(3) FOR RATIFICATION OF THE APPOINTMENT OF 
    ERNST & YOUNG LLP AS THE COMPANY'S
    INDEPENDENT AUDITORS                              / /      / /        / /

(4) IN THEIR DIRECTION, THE HOLDERS OF THIS 
    PROXY ARE AUTHORIZED TO VOTE UPON SUCH 
    OTHER BUSINESS AS MAY PROPERLY COME BEFORE 
    THE MEETING.


                          I plan to attend the meeting.    / /

The undersigned hereby revokes any proxy or proxies heretofore given for such
shares and ratifies all that said proxies or their substitutes may lawfully do
by virtue hereof.


Signature(s)                                       Dated        , 1997
             -------------------------------------       -------


Please sign exactly as name appears on this proxy. If stock is held jointly,
both persons should sign. Persons signing in a representative capacity should
give their title.


- - - -------------------------------------------------------------------------------
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