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


                       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):  AUGUST 8, 2001



                             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) 654-1414


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


ITEM 9.  REGULATION FD DISCLOSURE

     In accordance with General Instruction B.2. of Form 8-K, the following
information 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
shall be 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" 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:

 .  uncertainties inherent in the exploration for and development and production
   of oil and gas and in estimating reserves;
 .  unexpected future capital expenditures (including the amount and nature
   thereof);
 .  impact of crude oil price fluctuations;
 .  the effects of competition;
 .  the success of our risk management activities;
 .  the availability (or lack thereof) of acquisition or combination
   opportunities;
 .  the impact of current and future laws and governmental regulations;
 .  environmental liabilities that are not covered by an indemnity or insurance,
   and
 .  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.

DISCLOSURE OF YEAR 2001 ESTIMATES

The following table reflects the Company's current estimates of certain results
for the third quarter of 2001, the fourth quarter of 2001 and the year ending
December 31, 2001. 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. 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"), which are
incorporated by reference herein.

                                       2



                       Operating and Financial Guidance





                                                                  QUARTER ENDED              QUARTER ENDED            YEAR ENDED
                                                               SEPTEMBER 30, 2001          DECEMBER 31, 2001      DECEMBER 31, 2001
                                                               ------------------          -----------------      -----------------
                                                                                                          
ESTIMATED SALES VOLUMES
 Barrels of oil equivalent - MBOE                                 2,475-2,525                2,525-2,600            9,700-9,900
  MBOE PER DAY                                                     26.9-27.4                  27.4-28.3              26.7-27.0
 % Oil                                                                94%                        94%                    94%
 % Gas                                                                 6%                        6%                     6%

 ESTIMATED OIL PRICE DIFFERENTIALS - $/BO
 Estimated Differentials to NYMEX Prices - pre hedge             $5.35 - $5.50              $5.35 - $5.50          $5.75 - $6.00
 Estimated Hedging gain (loss)  based on: ($ in thousands)
 $22.00 NYMEX                                                        $3,600                    $3,600
 $23.00 NYMEX                                                        $2,800                    $2,800
 $25.00 NYMEX                                                        $1,250                    $1,250
 $26.00 NYMEX                                                         $470                      $470
 $27.00 NYMEX                                                        ($320)                    ($320)
 $30.00 NYMEX                                                       ($4,300)                  ($4,300)

 CRUDE OIL HEDGE POSITIONS - BARRELS PER DAY
 Collars -Floor  $20.00; Cap  $27.00; Cap Limit  $30.00              6,000                      6,000
 Puts - Floor $20.00                                                 6,000                      6,000
 Swaps - Average price $26.59 per barrel                             8,500                      8,500
 Calls - Average price/bbl $35.74                                    9,000                      9,000

 OPERATING COSTS PER BOE
 Production expenses                                             $8.00 - $8.25              $7.75 - $8.00          $7.60 - $7.80
 General and administrative                                      $1.00 - $1.10              $1.00 - $1.10          $1.15 - $1.25
 DD&A - oil and gas                                                  $2.64                      $2.64                  $2.64

 OTHER INCOME (EXPENSE) ($ IN THOUSANDS)
 Equity in earnings of Plains All American Pipeline, L.P.            $5,100
  ("PAA")
 DD&A - other                                                         400                        400                   1,700
 Interest expense                                                    6,400                      6,400                 26,100

 BOOK TAX RATE
 Current                                                               5%                        5%                     5%
 Deferred                                                             35%                        35%                    35%

 EQUIVALENT SHARES OUTSTANDING
 Basic                                                               23,100                    23,100                 20,800
 Diluted                                                             26,300                    26,300                 27,400

 CAPITAL EXPENDITURES ($ IN THOUSANDS)                         $31,000 - $34,000         $20,000 - $22,000      $120,000 - $125,000

 DISTRIBUTIONS FROM PLAINS ALL AMERICAN PIPELINE, L.P.               $6,695                    $6,680                 $31,282


                                       3


NOTES:

     1.  Estimated Sales Volumes. Production estimates are based on historical
         operating performance and trends and the Company's 2001 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.
         Certain of the Company's operations in California that have
         interruptible electrical contracts have been adversely impacted by
         electrical service interruptions. The Company estimates that its oil
         and gas production for the first six months of 2001 was adversely
         affected by approximately 60,000 BOE, as a result of such
         interruptions. Although under recent regulatory rulings the Company
         believes that its operations will only be affected if rolling blackouts
         occur and the Company has made operational changes to mitigate the
         effects of electrical interruptions, there can be no assurance that
         operations will not be adversely impacted in the future by the
         California power market.

         SEC Staff Accounting Bulletin 101 ("SAB 101") requires that revenue
         from crude oil production be recognized as the volumes are sold versus
         when produced. Due to the location of the Company's Florida properties
         and the transportation issues involved, reported sales volumes are
         impacted by the timing of the barges that transport the crude oil. The
         Florida crude is typically sold in shipments that range from 130,000 to
         180,000 barrels.

     2.  Estimated Oil Price Differentials. The Company's realized wellhead
         crude oil price is lower than the NYMEX index level as a result of area
         and quality differentials. The Company has locked in a fixed price
         differential to NYMEX on approximately 65% of its estimated 2001
         production volumes. Third and fourth quarter estimated differentials by
         area are: Onshore California - $4.50 per barrel, Offshore California -
         $6.85 per barrel, Florida - $14.00 per barrel, and Illinois - $.80 per
         barrel and are based on current market conditions. The estimated
         hedging gain(loss) is calculated based on the NYMEX prices presented
         and the Company's current crude oil hedge positions.

     3.  Operating Costs per BOE. Production expenses (including production
         and ad valorem taxes) averaged $7.01 per BOE in 2000. The Company
         estimates that production expenses will average $8.00-$8.25 per BOE
         during the third quarter of 2001, $7.75 - $8.00 per BOE during the
         fourth quarter of 2001, and $7.60 - $7.80 per BOE for the full year
         primarily due to increased electricity and fuel related expenses. Unit
         G&A costs exclude nonrecurring costs related to the strategic
         restructuring that we completed in June 2001. DD&A per BOE is based on
         our year-end 2000 proved reserve volumes.

     4.  Other Income (expense). Equity in earnings of Plains All American
         Pipeline, L.P. (NYSE: PAA) is based on guidance provided by PAA in its
         August 7, 2001 earnings release conference call and an aggregate
         ownership interest of approximately 33%, consisting of (i) a 44%
         ownership stake in the general partner interest and incentive
         distribution rights, (ii) 48%, or approximately 4.5 million, of the
         subordinated units and (iii) 28%, or approximately 7.9 million of the
         common units. The Company currently owns 46% of the general partner
         interest. For purposes of the estimate provided, it is assumed that PAA
         management exercises its option to acquire an incremental 2% ownership
         in the general partner of PAA.

         Estimated interest expense consists of interest expense on the $275
         million of subordinated notes, net of capitalized interest of
         approximately $.9 million per quarter and assumes no outstanding
         amounts on the Company's revolving credit facility. The Company incurs
         a non-use fee of 3/8ths of 1% per annum on its $225 million revolving
         credit facility.

     5.  Book Tax Rate. The Company's book tax rate is based on an adjusted
         Federal rate of 33% and an estimated combined foreign and state rate of
         7%. The foreign tax is attributable to the Canadian operations of PAA.
         The Company's deferred and current tax rates are based on current
         estimates of taxable income and utilization of net operating loss
         carryforwards.

                                       4


     6.  Equivalent shares outstanding. Estimated basic shares outstanding
         are based on shares outstanding on June 30, 2001, net of treasury
         shares. Estimated diluted shares are based on basic shares outstanding,
         plus shares issuable upon conversion of preferred stock and outstanding
         options and warrants utilizing the treasury stock method for the
         options and warrants.

     7.  Distributions from Plains All American Pipeline, L.P. The third and
         fourth quarter cash distributions are based on PAA's recently declared
         $.50 per unit distribution. The third and fourth quarter estimates are
         based on a 46% and 44% general partner interest, respectively. The full
         year estimate reflects the actual distributions received in the first
         and second quarter plus the third and fourth quarter estimates. The
         amounts presented reflect estimated cash payments to be received from
         PAA and have not been adjusted for cash taxes attributable to the
         Company's equity in earnings of PAA.




                                   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:  August 8, 2001                  /s/ Cynthia A. Feeback
                                       -------------------------------
                                       Cynthia A. Feeback
                                       Vice President - Accounting and Treasurer


                                       5