================================================================================


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT


     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


          DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): MAY 2, 2003



                              PLAINS RESOURCES INC.
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)



        DELAWARE                                       13-2898764
 (STATE OF INCORPORATION)                  (I.R.S. EMPLOYER IDENTIFICATION NO.)


                                     0-9808
                              (COMMISSION FILE NO.)


                          500 DALLAS STREET, SUITE 700
                              HOUSTON, TEXAS 77002
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
                                   (ZIP CODE)


       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (713) 739-6700


================================================================================

ITEM 7.        FINANCIAL STATEMENTS AND EXHIBITS

               (c) EXHIBIT 99.1 - PRESS RELEASE DATED MAY 2, 2003

ITEM 9 AND 12. REGULATION FD DISCLOSURE; RESULTS OF OPERATIONS AND
               FINANCIAL CONDITION

         Plains Resources Inc. (the "Company", "our", "we" or "us") today
issued a press release reporting its first quarter results. The Company is
furnishing the press release, attached as Exhibit 99.1, pursuant to Item 9 and
Item 12 of Form 8-K. The Company is also furnishing pursuant to Item 9 its
estimates of certain operating and financial results for the three months ended
June 30, 2003 and the year ended December 31, 2003. In accordance with General
Instruction B.2. of Form 8-K, the information presented under this Item 9,
including Exhibit 99.1, shall not be deemed "filed" for purposes of Section 18
of the Securities Act of 1934, as amended, nor shall it be deemed incorporated
by reference in any filing under the Securities Act of 1933, as amended, except
as expressly set forth by specific reference in such a filing.

FORWARD-LOOKING STATEMENTS AND ASSOCIATED RISKS

         All statements, other than statements of historical fact, included in
this report are forward-looking statements, including, but not limited to,
statements identified by the words "anticipate," "believe," "estimate,"
"expect," "plan," "intend" "will" and "forecast" and similar expressions and
statements regarding our business strategy, plans and objectives of our
management for future operations. These statements reflect our current views
with respect to future events, based on what we believe are reasonable
assumptions. These statements, however, are subject to certain risks,
uncertainties and assumptions, including, but not limited to:

o   the consequences of any potential change in the relationship between us and
    Plains Exploration & Production Company;
o   the consequences of our and Plains Exploration's officers and employees
    providing services to both us and Plains Exploration and not being required
    to spend any specified percentage of or amount of their time on our
    business;
o   risks, uncertainties and other factors that could have an impact on Plains
    All American Pipeline, L.P., or PAA, which could in turn impact the value of
    our holdings in PAA (for a discussion of these risks, uncertainties and
    other factors, see PAA's filings with the SEC);
o   the effects of our indebtedness, which could adversely restrict our ability
    to operate, could make us vulnerable to general adverse economic and
    industry conditions, could place us at a competitive disadvantage compared
    to our competitors that have less debt, and could have other adverse
    consequences;
o   uncertainties inherent in the exploration for and development and production
    of oil and gas and in estimating reserves;
o   unexpected future capital expenditures (including the amount and nature
    thereof);
o   impact of oil and gas price fluctuations, particularly given the termination
    of hedge accounting for our hedges;
o   the effects of competition;
o   the success of our risk management activities;
o   the availability (or lack thereof) of acquisition or combination
    opportunities;
o   the impact of current and future laws and governmental regulations;
o   environmental liabilities that are not covered by an indemnity or insurance;
    and
o   general economic, market or business conditions.

         If one or more of these risks or uncertainties materialize, or if
underlying assumptions prove incorrect, actual results may vary materially from
those in the forward-looking statements. Except as required by applicable
securities laws, we do not intend to update these forward-looking statements and
information.


                                       2


DISCLOSURE OF 2003 ESTIMATES

         The following table and notes reflect current estimates of certain
results for the three months ended June 30, 2003 and the year ended December
31, 2003 for the Company. These estimates are based on assumptions and
estimates that management believes are reasonable based on currently available
information; however, management's assumptions and the Company's future
performance are both subject to a wide range of business risks and uncertainties
and there is no assurance that these goals and estimates can or will be met. Any
number of factors could cause actual results to differ materially from those in
the following table, including but not limited to the factors discussed above.
The estimates set forth below are given as of the date hereof only based on
information available as of the date hereof. The Company undertakes no
obligation to publicly update or revise any forward-looking statements. Further
information on risks and uncertainties is available in the Company's filings
with the Securities and Exchange Commission ("SEC"), and we encourage you to
review such filings.


                                       3

                             PLAINS RESOURCES INC.
                        OPERATING AND FINANCIAL GUIDANCE




                                                                                THREE MONTHS ENDED            YEAR ENDED
                                                                                   JUNE 30, 2003           DECEMBER 31, 2003
                                                                            ------------------------   -----------------------
                                                                                                    
 ESTIMATED PRODUCTION VOLUMES
 Barrels of oil  -  MBbl                                                                   215 - 230                850 - 900
  MBbl per day                                                                               2.4-2.5                2.3 - 2.5
 % Oil                                                                                          100%                     100%

 ESTIMATED OIL PRICE DIFFERENTIAL TO NYMEX (PRE-HEDGE) - $/Bbl                         $7.50 - $8.50            $7.50 - $8.50

 CRUDE OIL HEDGE POSITIONS - BARRELS PER DAY
 Swaps - average price $26.10 per barrel                                                       1,500                    1,500

 OPERATING COSTS PER BARREL
 Production expenses                                                                   $7.05 - $7.20            $7.05 - $7.20
 Production and ad valorem taxes                                                       $1.20 - $1.30            $1.20 - $1.30
 Oil transportation expenses                                                           $4.00 - $4.25            $4.00 - $4.25
 DD&A - oil and gas                                                                            $4.68                    $4.68
 Accretion of asset retirement obligation                                                      $0.26                    $0.26

 OTHER INCOME (EXPENSE) ($ IN THOUSANDS)
 Equity in earnings of Plains All American Pipeline, L.P.                            $5,000 -$ 5,900         $19,600 -$21,300
 General and administrative expense
    Cash expense                                                                         $700 - $775          $3,000 -$ 3,300
    Noncash compensation expense                                                                 800                    2,900
                                                                           -------------------------   -----------------------
    Total general and administrative expense                                         $1,500 - $1,575          $5,900 - $6,200
                                                                           =========================   =======================

 Interest expense                                                                             Note 6                   Note 6
 Other DD&A                                                                                      $75                     $300

 BOOK TAX RATE
 Current                                                                                         20%                      20%
 Deferred                                                                                        28%                      28%

 WEIGHTED AVERAGE EQUIVALENT SHARES OUTSTANDING (IN THOUSANDS)
 Basic                                                                                        23,550                   23,660
 Restricted stock                                                                                322                      286
 Options (treasury method assuming $11.75 common stock price)                                    185                      185
 Series D Preferred (if dilutive)                                                              1,671                    1,671
                                                                           -------------------------   -----------------------
 Diluted shares                                                                               25,728                   25,802
                                                                           =========================   =======================

 CAPITAL EXPENDITURES ($ IN THOUSANDS)                                                        $1,700          $3,500 - $4,000

 DISTRIBUTIONS FROM PLAINS ALL AMERICAN PIPELINE, L.P. ($ IN THOUSANDS)
 General partner interest                                                                       $815                   $3,127
 Limited partner units                                                                         6,978                   27,756
                                                                           -------------------------   -----------------------
                                                                                              $7,793                  $30,883
                                                                           =========================   =======================




                                       4


Notes:

   1.   Estimated production volumes. Production estimates are based on
        historical operating performance and trends and the Company's 2003
        capital budget and assume that market demand and prices for oil and gas
        will continue at levels that allow for profitable production of these
        products.
        SEC Staff Accounting Bulletin 101 ("SAB 101") requires that revenue from
        oil production be recognized as the volumes are sold versus when
        produced. The location of the Company's Florida properties and the
        timing of the barges that transport the oil to market cause reported
        sales volumes to differ from production volumes. Actual timing of sales
        volumes is difficult to predict. The Company's oil production is
        typically sold in shipments of approximately 110,000-140,000 barrels and
        typically occurs every 30-50 days.
   2.   Estimated oil price differentials. The Company's realized wellhead oil
        price is lower than the NYMEX index level as a result of area and
        quality differentials. Differentials like commodity prices are
        difficult to predict and increased significantly over recent levels
        during the first quarter of 2003.
   3.   Discontinuation of hedge accounting. During the first quarter of 2003,
        the NYMEX oil price and the price the Company receives for its Florida
        oil production did not correlate closely enough for the Company's hedges
        to qualify for hedge accounting pursuant to the provisions of SFAS No.
        133 "Accounting for Derivative Instruments and Hedging Activities". As a
        result, the Company was required to discontinue hedge accounting
        effective February 1, 2003 and reflect the mark-to-market value of its
        hedges in earnings. Previously, the Company included gains or losses for
        hedges in earnings based on cash settlements for the period that the
        related volumes were delivered. The foregoing financial guidance does
        not include assumptions or projections with respect to potential gains
        or losses related to changes in fair value recognized pursuant to SFAS
        133, as there is no accurate way to forecast these potential gains or
        losses. Absent a stable oil price environment, the potential gains or
        losses related to SFAS 133 are likely to materially change reported net
        income and increase the volatility of reported net income due to
        non-cash mark-to-market gains or losses.
   4.   General and administrative expense. Estimated G&A expense for the second
        quarter and year ended December 31, 2003 includes approximately $0.8
        million and $2.9 million, respectively of noncash compensation expense,
        primarily related to restricted stock grants to officers and directors
        of the Company. Restricted shares are included in the weighted average
        share count for diluted earnings per share from the date of issuance.
        Restricted shares are included in the share count for basic earnings per
        share when they vest.
   5.   Equity in earnings of Plains All American Pipeline, L.P. ("PAA"). The
        Company's equity in earnings from PAA is based on guidance provided by
        PAA in its Form 8-K filed with the SEC on April 25, 2003 for the three
        months ended June 30, 2003, and its Form 8-K filed with the SEC on
        February 26, 2003 for the year ended December 31, 2003, and the
        Company's aggregate ownership interest, as adjusted for general partner
        incentive distributions. As of the date hereof, the Company has an
        aggregate ownership interest of approximately 24%, consisting of (i) a
        44% ownership stake in the general partner interest and incentive
        distribution rights, (ii) 45%, or approximately 4.5 million, of the
        subordinated units and (iii) 19%, or approximately 7.9 million of the
        common units (including 1.3 million Class B common units). PAA's Form
        8-K's provide guidance of $19.7 million to $23.1 million for its second
        quarter 2003 net income and $75.7 million to $82.5 million for the full
        year 2003. The Company encourages you to refer to the 8-K's


                                       5


        filed by PAA for additional information concerning guidance provided by
        PAA, including certain expenses that are not reflected in the net income
        guidance provided by PAA. These expenses relate to the potential vesting
        of restricted units in 2003. Certain of the restricted units may vest in
        the same proportion as the conversion of PAA's subordinated units and
        others vest when PAA achieves targeted distribution levels. PAA will
        recognize an expense when the financial tests for conversion of
        subordinated units and required distribution levels are met. The income
        effect on the Company's equity in earnings of PAA may be somewhat
        mitigated because the Company may recognize a noncash gain when PAA's
        subordinated units vest. Such gain would be similar to the gains that
        the Company has recognized in the past when PAA issues common equity and
        would be recognized because the subordinated units owned by the Company
        would no longer be subordinated in any way to common units, including
        the right to receive distributions, including distributions upon an
        assumed liquidation of PAA.
   6.   Interest expense. The Company's interest expense will consist of
        interest on amounts outstanding under its $45 million secured term loan
        facility. Borrowings under the facility bear interest, at the Company's
        option, at LIBOR plus 3% or prime plus 1.5%. The balance outstanding on
        the term loan was $40.5 million at March 31, 2003. Based on the loan
        amortization schedule, the balance will be reduced to $27.0 million at
        December 31, 2003.
   7.   Book tax rate. The Company's book tax rate is based on a Federal rate of
        35% and an estimated combined foreign and state rate of 13%. The foreign
        tax is attributable to the Canadian operations of PAA and represents
        approximately 70% of the 20% estimated current rate. The Company's
        deferred and current tax rates are based on current estimates of book
        and taxable income and utilization of net operating loss carryforwards.
        At December 31, 2002, the Company had carryforwards of approximately
        $46.4 million of regular tax net operating losses, $15.0 million of
        alternative minimum tax net operating losses and approximately $3.8
        million of enhanced oil recovery credits.
   8.   Weighted average equivalent shares outstanding. Estimated basic shares
        are based on shares outstanding on April 30, 2003, net of treasury
        shares and assumes no additional treasury purchases. The Company may
        purchase additional treasury shares in 2003. Diluted shares include the
        effect of restricted stock as well as outstanding options and preferred
        stock, when dilutive. The Company currently has approximately 4.2
        million outstanding stock options with an average exercise price of
        $13.26 per share. Utilizing the treasury stock method and an assumed
        stock price of $11.75, the options would add approximately 185,000
        shares to the diluted share count. In addition, the Company has 46,600
        shares of Series D Cumulative Convertible Preferred Stock, or Series D
        Preferred, that is convertible into 1,671,416 shares of common stock for
        a current conversion price of $13.94. The Series D Preferred has an
        aggregate stated value of $23.3 million and bears an annual dividend of
        $30.00 per share (approximately $1.4 million). Depending on the
        Company's net income, the Series D Preferred may at times be
        anti-dilutive and not reflected in the diluted share count.
   9.   Capital expenditures. Capital expenditures are based on the Company's
        2003 capital budget for its oil and gas properties. These expenditures
        do not include any estimated amounts for capital contributions that the
        Company may be required to make for its general partner interest in PAA.
        When PAA issues equity, the general partner is required to contribute
        cash to maintain its 2% general partner interest. In March 2003, PAA
        issued 2.6 million shares in a public equity offering. The Company was
        required to make a cash capital contribution to the general partner of
        PAA in the amount of $0.6 million for its 44% interest in the general
        partner. If PAA issues equity in the future, the company will be
        required to make additional cash capital contributions.
   10.  Distributions from Plains All American Pipeline, L.P. The estimated cash
        distributions for the second quarter are based on PAA's $0.55 per unit
        quarterly distribution ($2.20 on an annual basis) that was declared in
        April 2003. The estimated cash distributions for the twelve months


                                       6


        ended December 31, 2003 are based on the $0.5375 per unit distribution
        paid by PAA in the first quarter plus estimated distributions in the
        second, third and fourth quarters of $0.55 per unit. The amounts
        presented reflect estimated cash to be received from PAA and have not
        been adjusted for cash taxes.

   11.  Write-downs under full cost ceiling test rules. Under the SEC's full
        cost accounting rules, the Company reviews the carrying value of its
        proved oil and gas properties at the end of each quarter. Under these
        rules, capitalized costs of proved oil and gas properties (net of
        accumulated DD&A, and including deferred income taxes) may not exceed a
        "ceiling" equal to the present value (discounted at 10%) of estimated
        future cash flows from proved oil and gas reserves of such properties
        (including the effect of any hedging related activities) reduced by
        future operating expenses, development expenditures and abandonment
        costs (net of salvage values) and estimated future income taxes. The
        rules require that the Company price its future oil and gas production
        at the prices in effect at the end of each fiscal quarter and require a
        write-down if its capitalized costs exceed the "ceiling" even if prices
        decline for only a short period of time. The Company estimates that
        based on the book value of its proved oil and gas properties (including
        related deferred income taxes) and its estimated proved reserves as of
        March 31, 2003, that the Company would have a write-down under the full
        cost ceiling test rules at a net realized price for the Company's oil
        production of approximately $16.35 per barrel. Based on the estimated
        oil differential for 2003 plus oil transportation totalling
        $11.50 - $12.75 per barrel, the Company would have a write-down at
        a NYMEX crude oil index price of $27.85 - $29.10 per barrel.



                                       7

                                   SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Company has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                            PLAINS RESOURCES INC.



Date:  May 2, 2003                          /s/ Stephen A. Thorington
                                            -----------------------------------
                                            Stephen A. Thorington
                                            Executive Vice President
                                              and Chief Financial Officer



                                       8

                                 EXHIBIT INDEX



     Exhibit 99.1  --  Press Release dated May 2, 2003