<PAGE>

                                                                   EXHIBIT 10.44

NEITHER THIS WARRANT NOR THE SHARES ISSUABLE UPON EXERCISE HEREOF HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT")
OR ANY OTHER APPLICABLE STATE SECURITIES LAWS IN RELIANCE UPON AN EXEMPTION FROM
THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND SUCH OTHER SECURITIES
LAWS. NEITHER THIS WARRANT NOR THE SHARES ISSUABLE UPON EXERCISE HEREOF MAY BE
SOLD, PLEDGED, TRANSFERRED, ENCUMBERED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR IN A
TRANSACTION WHICH IS EXEMPT FROM REGISTRATION UNDER THE PROVISIONS OF THE
SECURITIES ACT OR ANY APPLICABLE STATE LAWS. THIS WARRANT MAY NOT BE EXERCISED
BY OR ON BEHALF OF A UNITED STATES PERSON UNLESS REGISTERED UNDER THE SECURITIES
ACT OR AN EXEMPTION FROM SUCH REGISTRATION IS AVAILABLE.

                             STOCK PURCHASE WARRANT

                To Purchase __________ Shares of Common Stock of

                            IMPCO TECHNOLOGIES, INC.

     THIS CERTIFIES that, for value received, ______________ (the "Holder"), is
entitled, upon the terms and subject to the limitations on exercise and the
conditions hereinafter set forth, at any time on or after the date hereof (the
"Initial Exercise Date") and on or prior to the close of business on January 11,
2006 (the "Termination Date") but not thereafter, to subscribe for and purchase
from IMPCO Technologies, Inc., a corporation incorporated in the State of
Delaware (the "Company"), up to _________ shares (the "Warrant Shares") of
Common Stock, $0.001 par value, of the Company (the "Common Stock"). The
purchase price of one share of Common Stock (the "Exercise Price") under this
Warrant shall be $13.25. The Exercise Price and the number of shares for which
the Warrant is exercisable shall be subject to adjustment as provided herein. In
the event of any conflict between the terms of this Warrant and the Common Stock
Purchase Agreement dated as of January 11, 2002 pursuant to which this Warrant
has been issued (the "Purchase Agreement"), the Purchase Agreement shall
control. Capitalized terms used and not otherwise defined herein shall have the
meanings set forth for such terms in the Purchase Agreement.

     1. Title to Warrant. Prior to the Termination Date and subject to
        ----------------
compliance with applicable laws and the terms hereof, this Warrant and all
rights hereunder are transferable, in whole or in part, at the office or agency
of the Company by the holder hereof in person or by duly authorized attorney,
upon surrender of this Warrant together with the Assignment Form annexed hereto
properly endorsed.

     2. Authorization of Shares. The Company covenants that all shares of Common
        -----------------------
Stock which may be issued upon the exercise of the purchase rights represented
by this Warrant will, upon exercise of the purchase rights represented by this
Warrant, be duly

                                       1

<PAGE>

authorized, validly issued, fully paid and nonassessable and free from all
taxes, liens and charges in respect of the issue thereof (other than taxes in
respect of any transfer occurring contemporaneously with such issue).

     3. Exercise of Warrant.
        -------------------

          (a) Except as provided in Section 4 herein, exercise of the purchase
rights represented by this Warrant may be made at any time or times on or after
the Initial Exercise Date, and before the close of business on the Termination
Date by the surrender of this Warrant and the Notice of Exercise Form annexed
hereto duly executed, at the office of the Company (or such other office or
agency of the Company as it may designate by notice in writing to the registered
holder hereof at the address of such holder appearing on the books of the
Company) and upon payment of the Exercise Price of the shares thereby purchased
by wire transfer or cashier's check drawn on a United States bank, the holder of
this Warrant shall be entitled to receive a certificate for the number of shares
of Common Stock so purchased. Certificates for shares purchased hereunder shall
be delivered to the holder hereof within three (3) Trading Days after the date
on which this Warrant shall have been exercised as aforesaid. This Warrant shall
be deemed to have been exercised and such certificate or certificates shall be
deemed to have been issued, and Holder or any other person so designated to be
named therein shall be deemed to have become a holder of record of such shares
for all purposes, as of the date the Warrant has been exercised by payment to
the Company of the Exercise Price and all taxes required to be paid by Holder,
if any, pursuant to Section 5 prior to the issuance of such shares, have been
paid.

          (b) If this Warrant shall have been exercised in part, the Company
shall, at the time of delivery of the certificate or certificates representing
Warrant Shares, deliver to Holder a new Warrant evidencing the rights of Holder
to purchase the unpurchased shares of Common Stock called for by this Warrant,
which new Warrant shall in all other respects be identical with this Warrant.

          (c) If there is no registration statement in effect which would permit
the free resale of the Warrant Shares by the Holder, at any time which is ninety
(90) days after the date of this Warrant, then this Warrant shall also be
exercisable by means of a "cashless exercise" in which the holder shall be
entitled to receive a certificate for the number of shares equal to the quotient
obtained by dividing [(A-B) (X)] by (A), where:

(A) = the volume weighted average price per share of Common Stock on the Trading
Day preceding the date of such election on the Nasdaq Stock Market, or if the
Common Stock is not traded on the Nasdaq Stock Market, then the Principal Market
in terms of volume, and converted into US Dollars;

(B) =  the Exercise Price of the Warrants; and

(X) = the number of shares issuable upon exercise of the Warrants in accordance
with the terms of this Warrant.

                                        2


<PAGE>

     4. No Fractional Shares or Scrip. No fractional shares or scrip
        -----------------------------
representing fractional shares shall be issued upon the exercise of this
Warrant. As to any fraction of a share which Holder would otherwise be entitled
to purchase upon such exercise, the Company shall pay a cash adjustment in
respect of such final fraction in an amount equal to such fraction multiplied by
the Exercise Price.

     5. Charges, Taxes and Expenses. Issuance of certificates for shares of
        ---------------------------
Common Stock upon the exercise of this Warrant shall be made without charge to
the holder hereof for any issue or transfer tax or other incidental expense in
respect of the issuance of such certificate, all of which taxes and expenses
shall be paid by the Company, and such certificates shall be issued in the name
of the holder of this Warrant or in such name or names as may be directed by the
holder of this Warrant; provided, however, that in the event certificates for
shares of Common Stock are to be issued in a name other than the name of the
holder of this Warrant, this Warrant when surrendered for exercise shall be
accompanied by the Assignment Form attached hereto duly executed by the holder
hereof; and the Company may require, as a condition thereto, the payment of a
sum sufficient to reimburse it for any transfer tax incidental thereto.

     6. Closing of Books. The Company will not close its stockholder books or
        ----------------
records in any manner which prevents the timely exercise of this Warrant.

     7. Transfer, Division and Combination. (a) Subject to compliance with any
        ----------------------------------
applicable securities laws, transfer of this Warrant and all rights hereunder,
in whole or in part, shall be registered on the books of the Company to be
maintained for such purpose, upon surrender of this Warrant at the principal
office of the Company, together with a written assignment of this Warrant
substantially in the form attached hereto duly executed by Holder or its agent
or attorney and funds sufficient to pay any transfer taxes payable upon the
making of such transfer. Upon such surrender and, if required, such payment, the
Company shall execute and deliver a new Warrant or Warrants in the name of the
assignee or assignees and in the denomination or denominations specified in such
instrument of assignment, and shall issue to the assignor a new Warrant
evidencing the portion of this Warrant not so assigned, and this Warrant shall
promptly be cancelled. A Warrant, if properly assigned, may be exercised by a
new holder for the purchase of shares of Common Stock without having a new
Warrant issued.

          (b) This Warrant may be divided or combined with other Warrants upon
presentation hereof at the aforesaid office of the Company, together with a
written notice specifying the names and denominations in which new Warrants are
to be issued, signed by Holder or its agent or attorney. Subject to compliance
with Section 7(a), as to any transfer which may be involved in such division or
combination, the Company shall execute and deliver a new Warrant or Warrants in
exchange for the Warrant or Warrants to be divided or combined in accordance
with such notice.

          (c) The Company shall prepare, issue and deliver at its own expense
(other than transfer taxes) the new Warrant or Warrants under this Section 7.

          (d) The Company agrees to maintain, at its aforesaid office, books for
the registration and the registration of transfer of the Warrants.


                                        3


<PAGE>

     8. No Rights as Shareholder until Exercise. This Warrant does not entitle
        ---------------------------------------
the holder hereof to any voting rights or other rights as a shareholder of the
Company prior to the exercise hereof. Upon the surrender of this Warrant and the
payment of the aggregate Exercise Price, the Warrant Shares so purchased shall
be and be deemed to be issued to such holder as the record owner of such shares
as of the close of business on the later of the date of such surrender or
payment.

     9. Loss, Theft, Destruction or Mutilation of Warrant. The Company covenants
        -------------------------------------------------
that upon receipt by the Company of evidence reasonably satisfactory to it of
the loss, theft, destruction or mutilation of this Warrant certificate or any
stock certificate relating to the Warrant Shares, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it (which shall
not include the posting of any bond), and upon surrender and cancellation of
such Warrant or stock certificate, if mutilated, the Company will make and
deliver a new Warrant or stock certificate of like tenor and dated as of such
cancellation, in lieu of such Warrant or stock certificate.

     10. Saturdays, Sundays, Holidays, etc. If the last or appointed day for the
         ---------------------------------
taking of any action or the expiration of any right required or granted herein
shall be a Saturday, Sunday or a legal holiday, then such action may be taken or
such right may be exercised on the next succeeding day not a Saturday, Sunday or
legal holiday.

     11. Adjustments of Exercise Price and Number of Warrant Shares; Stock
         -----------------------------------------------------------------
Splits, etc. The number and kind of securities purchasable upon the exercise of
-----------
this Warrant and the Exercise Price shall be subject to adjustment from time to
time upon the happening of any of the following. In case the Company shall (i)
pay a dividend in shares of Common Stock or make a distribution in shares of
Common Stock to holders of its outstanding Common Stock, (ii) subdivide its
outstanding shares of Common Stock into a greater number of shares of Common
Stock, (iii) combine its outstanding shares of Common Stock into a smaller
number of shares of Common Stock or (iv) issue any shares of its capital stock
in a reclassification of the Common Stock, then the number of Warrant Shares
purchasable upon exercise of this Warrant immediately prior thereto shall be
adjusted so that the holder of this Warrant shall be entitled to receive the
kind and number of Warrant Shares or other securities of the Company which he
would have owned or have been entitled to receive had such Warrant been
exercised in advance thereof. Upon each such adjustment of the kind and number
of Warrant Shares or other securities of the Company which are purchasable
hereunder, the holder of this Warrant shall thereafter be entitled to purchase
the number of Warrant Shares or other securities resulting from such adjustment
at an Exercise Price per Warrant Share or other security obtained by multiplying
the Exercise Price in effect immediately prior to such adjustment by the number
of Warrant Shares purchasable pursuant hereto immediately prior to such
adjustment and dividing by the number of Warrant Shares or other securities of
the Company resulting from such adjustment. An adjustment made pursuant to this
paragraph shall become effective immediately after the effective date of such
event retroactive to the record date, if any, for such event.

12. Reorganization, Reclassification, Merger, Consolidation or Disposition of
    -------------------------------------------------------------------------
Assets. In case the Company shall reorganize its capital, reclassify its capital
------
stock, consolidate or merge with or into another corporation (where the Company
is not the surviving corporation or where there is a change in or distribution
with respect to the Common Stock of the Company),

                                        4


<PAGE>

or sell, transfer or otherwise dispose of all or substantially all its
property, assets or business to another corporation and, pursuant to the terms
of such reorganization, reclassification, merger, consolidation or disposition
of assets, shares of common stock of the successor or acquiring corporation, or
any cash, shares of stock or other securities or property of any nature
whatsoever (including warrants or other subscription or purchase rights) in
addition to or in lieu of common stock of the successor or acquiring corporation
("Other Property"), are to be received by or distributed to the holders of
Common Stock of the Company, then Holder shall have the right thereafter to
receive, upon exercise of this Warrant, the number of shares of common stock of
the successor or acquiring corporation or of the Company, if it is the surviving
corporation, and Other Property receivable upon or as a result of such
reorganization, reclassification, merger, consolidation or disposition of assets
by a holder of the number of shares of Common Stock for which this Warrant is
exercisable immediately prior to such event. In case of any such reorganization,
reclassification, merger, consolidation or disposition of assets, the successor
or acquiring corporation (if other than the Company) shall expressly assume the
due and punctual observance and performance of each and every covenant and
condition of this Warrant to be performed and observed by the Company and all
the obligations and liabilities hereunder, subject to such modifications as may
be deemed appropriate (as determined in good faith by resolution of the Board of
Directors of the Company) in order to provide for adjustments of shares of
Common Stock for which this Warrant is exercisable which shall be as nearly
equivalent as practicable to the adjustments provided for in this Section 12.
For purposes of this Section 12, "common stock of the successor or acquiring
corporation" shall include stock of such corporation of any class which is not
preferred as to dividends or assets over any other class of stock of such
corporation and which is not subject to redemption and shall also include any
evidences of indebtedness, shares of stock or other securities which are
convertible into or exchangeable for any such stock, either immediately or upon
the arrival of a specified date or the happening of a specified event and any
warrants or other rights to subscribe for or purchase any such stock. The
foregoing provisions of this Section 12 shall similarly apply to successive
reorganizations, reclassifications, mergers, consolidations or disposition of
assets.

     13. Voluntary Adjustment by the Company. The Company may at any time during
         -----------------------------------
the term of this Warrant reduce the then current Exercise Price to any amount
and for any period of time deemed appropriate by the Board of Directors of the
Company.

     14. Notice of Adjustment. Whenever the number of Warrant Shares or number
         --------------------
or kind of securities or other property purchasable upon the exercise of this
Warrant or the Exercise Price is adjusted, as herein provided, the Company shall
promptly mail by registered or certified mail, return receipt requested, to the
holder of this Warrant notice of such adjustment or adjustments setting forth
the number of Warrant Shares (and other securities or property) purchasable upon
the exercise of this Warrant and the Exercise Price of such Warrant Shares (and
other securities or property) after such adjustment, setting forth a brief
statement of the facts requiring such adjustment and setting forth the
computation by which such adjustment was made. Such notice, in the absence of
manifest error, shall be conclusive evidence of the correctness of such
adjustment.

                                        5


<PAGE>

     15. Notice of Corporate Action. If at any time:
         --------------------------

          (a) the Company shall take a record of the holders of its Common Stock
for the purpose of entitling them to receive a dividend or other distribution,
or any right to subscribe for or purchase any evidences of its indebtedness, any
shares of stock of any class or any other securities or property, or to receive
any other right, or

          (b) there shall be any capital reorganization of the Company, any
reclassification or recapitalization of the capital stock of the Company or any
consolidation or merger of the Company with, or any sale, transfer or other
disposition of all or substantially all the property, assets or business of the
Company to, another corporation or,

          (c) there shall be a voluntary or involuntary dissolution, liquidation
or winding up of the Company;

then, in any one or more of such cases, the Company shall give to Holder (i) at
least 20 days' (or as many days as is reasonably practicable) prior written
notice of the date on which a record date shall be selected for such dividend,
distribution or right or for determining rights to vote in respect of any such
reorganization, reclassification, merger, consolidation, sale, transfer,
disposition, liquidation or winding up, and (ii) in the case of any such
reorganization, reclassification, merger, consolidation, sale, transfer,
disposition, dissolution, liquidation or winding up, at least 20 days' prior
written notice of the date when the same shall take place. Such notice in
accordance with the foregoing clause also shall specify (i) the date on which
any such record is to be taken for the purpose of such dividend, distribution or
right, the date on which the holders of Common Stock shall be entitled to any
such dividend, distribution or right, and the amount and character thereof, and
(ii) the date on which any such reorganization, reclassification, merger,
consolidation, sale, transfer, disposition, dissolution, liquidation or winding
up is to take place and the time, if any such time is to be fixed, as of which
the holders of Common Stock shall be entitled to exchange their shares of Common
Stock for securities or other property deliverable upon such disposition,
dissolution, liquidation or winding up. Each such written notice shall be
sufficiently given if addressed to Holder at the last address of Holder
appearing on the books of the Company and delivered in accordance with Section
17(c).

     16. Authorized Shares. The Company covenants that during the period the
         -----------------
Warrant is outstanding, it will reserve from its authorized and unissued Common
Stock a sufficient number of shares to provide for the issuance of the Warrant
Shares upon the exercise of any purchase rights under this Warrant. The Company
further covenants that its issuance of this Warrant shall constitute full
authority to its officers who are charged with the duty of executing stock
certificates to execute and issue the necessary certificates for the Warrant
Shares upon the exercise of the purchase rights under this Warrant. The Company
will take all such reasonable action as may be necessary to assure that such
Warrant Shares may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of the Principal Market
upon which the Common Stock may be listed.

     The Company shall not by any action, including, without limitation,
amending its articles of incorporation or through any reorganization, transfer
of assets, consolidation, merger, dissolution, issue or sale of securities or
any other voluntary action, avoid

                                        6


<PAGE>

or seek to avoid the observance or performance of any of the terms of this
Warrant, but will at all times in good faith assist in the carrying out of all
such terms and in the taking of all such actions as may be necessary or
appropriate to protect the rights of Holder against impairment. Without limiting
the generality of the foregoing, the Company will (a) not increase the par value
of any shares of Common Stock receivable upon the exercise of this Warrant above
the amount payable therefor upon such exercise immediately prior to such
increase in par value, (b) take all such action as may be necessary or
appropriate in order that the Company may validly and legally issue fully paid
and nonassessable shares of Common Stock upon the exercise of this Warrant, and
(c) use commercially reasonable efforts to obtain all such authorizations,
exemptions or consents from any public regulatory body having jurisdiction
thereof as may be necessary to enable the Company to perform its obligations
under this Warrant.

     Before taking any action which would result in an adjustment in the number
of shares of Common Stock for which this Warrant is exercisable or in the
Exercise Price, the Company shall obtain all such authorizations or exemptions
thereof, or consents thereto, as may be necessary from any public regulatory
body or bodies having jurisdiction thereof.

     17. Miscellaneous.
         -------------

          (a) Jurisdiction. This Warrant shall be binding upon any successors or
              ------------
assigns of the Company. This Warrant shall constitute a contract under the laws
of Delaware, without regard to its conflict of law, principles or rules, and be
subject to arbitration pursuant to the terms set forth in the Purchase
Agreement.

          (b) Restrictions. The holder hereof acknowledges that the Warrant
              ------------
Shares acquired upon the exercise of this Warrant, if not registered, will have
restrictions upon resale imposed by state and federal securities laws.

          (c) Notices. Any notice, request or other document required or
              -------
permitted to be given or delivered to the holder hereof by the Company shall be
delivered in accordance with the notice provisions of the Purchase Agreement.

          (d) Remedies. Holder, in addition to being entitled to exercise all
              --------
rights granted by law, including recovery of damages, will be entitled to
specific performance of its rights under this Warrant. The Company agrees that
monetary damages would not be adequate compensation for any loss incurred by
reason of a breach by it of the provisions of this Warrant and hereby agrees to
waive the defense in any action for specific performance that a remedy at law
would be adequate.

          (e) Successors and Assigns. Subject to applicable securities laws,
              ----------------------
this Warrant and the rights and obligations evidenced hereby shall inure to the
benefit of and be binding upon the successors of the Company and the successors
and permitted assigns of Holder. The provisions of this Warrant are intended to
be for the benefit of all Holders from time to time of this Warrant and shall be
enforceable by any such Holder or holder of Warrant Shares.

                                        7


<PAGE>

          (f) Amendment. This Warrant may be modified or amended or the
              ---------
provisions hereof waived with the written consent of the Company and the Holder.

          (g) Severability. Wherever possible, each provision of this Warrant
              ------------
shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Warrant shall be prohibited by or
invalid under applicable law, such provision shall be ineffective to the extent
of such prohibition or invalidity, without invalidating the remainder of such
provisions or the remaining provisions of this Warrant.

          (h) Headings. The headings used in this Warrant are for the
              --------
convenience of reference only and shall not, for any purpose, be deemed a part
of this Warrant.


                                        8


<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its officer thereunto duly authorized.


Dated: ________ __, 2002
                                 IMPCO TECHNOLOGIES, INC.


                                 By:
                                        ----------------------------------------

                                 Name:
                                       -----------------------------------------

                                 Title:
                                        ----------------------------------------




                                        9


<PAGE>

                               NOTICE OF EXERCISE



To:  IMPCO Technologies, Inc.


     (1) The undersigned hereby elects to purchase ________ shares of Common
Stock (the "Common Stock"), of IMPCO Technologies, Inc. pursuant to the terms of
the attached Warrant, and tenders herewith payment of the exercise price in
full, together with all applicable transfer taxes, if any.

     (2) Please issue a certificate or certificates representing said shares of
Common Stock in the name of the undersigned or in such other name as is
specified below:



         ------------------------------------
         (Name)

         ------------------------------------
         (Address)
         ------------------------------------




Dated:


                                                  ------------------------------
                                                  Signature



<PAGE>

                                 ASSIGNMENT FORM

                    (To assign the foregoing warrant, execute
                   this form and supply required information.
                  Do not use this form to exercise thewarrant.)

     FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced thereby
are hereby assigned to


_______________________________________________ whose address is

___________________________________________________________________.



___________________________________________________________________

                                                 Dated:  ______________, _______


                           Holder's Signature:  _____________________________

                           Holder's Address:    _____________________________

                                                _____________________________



Signature Guaranteed:  ___________________________________________




NOTE: The signature to this Assignment Form must correspond with the name as it
appears on the face of the Warrant, without alteration or enlargement or any
change whatsoever, and must be guaranteed by a bank or trust company. Officers
of corporations and those acting in an fiduciary or other representative
capacity should file proper evidence of authority to assign the foregoing
Warrant.