| 1st | 2 | Andretti / Ickx | Ferrari 312 PB | Ferrari | 2:31.440 | 2:31.4400 |
| 2nd | 4 | Regazzoni / Redman | Ferrari 312 PB | Ferrari | 2:33.040 | 2:33.0400 |
| 3rd | 3 | Peterson / Schenken | Ferrari 312 PB | Ferrari | 2:33.800 | 3:35.3700 |
| 4th | 31 | Stommelen / Revson / de Adamich | Alfa Romeo T33/TT/3 | Autodelta, S.p.A. | 2:33.860 | 2:33.8600 |
| 5th | 34 | de Adamich / Galli / *Hezemans / *Vaccarella | Alfa Romeo T33/TT/3 | Autodelta, S.p.A. | 2:35.920 | 2:35.9200 |
| 6th | 32 | Elford / Marko | Alfa Romeo T33/TT/3 | Autodelta, S.p.A. | 2:37.610 | 2:37.6100 |
| 7th | 7 | Bell / van Lennep | Mirage M6 Ford | Gulf Research Racing Company | 2:40.670 | 2:40.6700 |
| 8th | 12 | Larrousse / Bonnier / Wisell | Lola T280 Ford | Ecurie Bonnier | 2:41.780 | 2:41.7800 |
| 9th | 25 | Craw / Barber | Chevron B19 Ford | Fred Opert | 2:51.270 | 2:51.2700 |
| 10th | 39 | Pechmann / Bartling / Minter | Porsche 910 | R. Brezinka | 2:54.090 | 2:54.0900 |
| 11th | 52 | Kleinpeter / Belcher | Chevron B21 Ford | Promotional Advertising Corp. | 2:54.910 | 2:54.9100 |
| 12th | 23 | Kemp / Koveleski | Chevrolet Corvette | Rinzler Motoracing, Inc./Holiday Anns of America | 2:56.310 | 2:56.3100 |
| 13th | 55 | McCaig / McCaig | Lola T212 Ford | Roger McCaig Racing | 2:56.560 | 2:56.5600 |
| 14th | 57 | Heinz / Johnson | Chevrolet Corvette | Dana English | 2:58.710 | 2:58.7100 |
| 15th | 56 | Waugh / Beatty | Lola T212 Ford | Promotional Advertising Corp. | 2:59.000 | 2:59.0000 |
| 16th | 26 | Junco / van Beuren, Jr. | Chevron B19 Ford | Fred Opert | 3:01.240 | 3:01.2400 |
| 17th | 1 | Hobbs / Scott | Ferrari 365 GTB/4 | Kirk F. White Motor Racing Inc. | 3:01.580 | 3:01.5800 |
| 18th | 54 | Arutunoff / Goellnicht | Abarth 2000 SP (SE010) | Automobiles International, Inc. | 3:02.050 | 3:02.0500 |
| 19th | 21 | Adamowicz / Posey | Ferrari 365 GTB/4 | N.A.R.T. | 3:02.260 | 3:02.2600 |
| 20th | 8 | Nehl / Fitzgerald | Chevrolet Camaro II | Automotive Engineering Enterprises | 3:04.890 | 3:04.8900 |
| 21st | 50 | Yenko / Cordts | Chevrolet Corvette C3 | John Greenwood Racing | 3:04.890 | 3:04.8900 |
| 22nd | 22 | Chinetti, Jr. / Grossman | Ferrari 365 GTB/4 | N.A.R.T. | 3:05.650 | 3:05.6500 |
| 23rd | 59 | Gregg / Haywood | Porsche 911 S | Brumos Porsche Audi Corp. | 3:05.740 | 3:05.7400 |
| 24th | 11 | DeLorenzo / Thompson | Ford Mustang | Troy Promotions, Inc. | 3:05.790 | 3:05.7900 |
| 25th | 48 | Greenwood / Smothers | Chevrolet Corvette | John Greenwood Racing | 3:06.040 | 3:06.0400 |
| 26th | 80 | Elliott / McDill | Chevrolet Camaro I | Preston Hood Chevrolet Inc. | 3:08.200 | 3:08.2000 |
| 27th | 94 | Mitchell / Christiansen | Chevrolet Camaro I | Bolus & Snopes, Ltd. | 3:08.590 | 3:08.5900 |
| 28th | 27 | Kirby / Hotchkis / *Cuddy | Porsche 914/6 | Bozzani Porsche Audi, Inc. | 3:08.800 | 3:08.8000 |
| 29th | 97 | Quintanilla / Martinez | Chevrolet Camaro I | Robeto Quintanilla Jr. | 3:09.000 | 3:09.0000 |
| 30th | 16 | Keyser / Barth | Porsche 911 S | Toad Hall Racing | 3:09.930 | 3:09.9300 |
| 31st | 63 | Greger / Blank / *Hild | Porsche 910 | Josef Greger | 3:10.130 | 3:10.1300 |
| 32nd | 61 | Locke / Bailey | Porsche 911 S | James N. Locke | 3:10.770 | 3:10.7700 |
| 33rd | 24 | Buffum / Fitzpatrick | Ford Escort RS 1600 | Libra International Racing | 3:13.110 | 3:13.1100 |
| 34th | 68 | Stoddard / Hines, Jr. / Harmstad | Porsche 914/6 | H&S Imports Racing | 3:13.860 | 3:13.8600 |
| 35th | 28 | Kremer / Huber / Bolanos | Porsche 911 S | Porsche Kremer Racing Team | 3:14.000 | 3:14.0000 |
| 36th | 74 | Rosen / Schaub | Porsche 906 | Carousel Porsche Audi, Inc. | 3:14.200 | 3:14.2000 |
| 37th | 70 | McDonald / Everett | Porsche 914/6 | Lee McDonald-Algar Porsche Audi, Inc. | 3:14.470 | 3:14.4700 |
| 38th | 37 | Belcher / Stevens | Chevrolet Camaro | Gary Belcher | 3:14.490 | 3:14.4900 |
| 39th | 38 | Fisher / Ponder | Chevron B16 Ford | Hobby Car Enterprises | 3:16.500 | 3:16.5000 |
| 40th | 43 | Sereix / Garcia | Chevrolet Camaro II | Garcia Racing | 3:17.000 | 3:17.0000 |
| 41st | 17 | Gimondo / Dingman | Chevrolet Camaro | Takondo Racing | 3:17.290 | 3:17.2900 |
| 42nd | 44 | Garcia / Cao | Chevrolet Nova | Larrauri Racing | 3:17.420 | 3:17.4200 |
| 43rd | 10 | Tremblay / Ellis-Brown | Chevrolet Camaro | C. C. Canada Lumber Co., Inc. | 3:17.650 | 3:17.6500 |
| 44th | 47 | Gray / Keller | Chevrolet Corvette | Sebring Racing Inc. | 3:17.690 | 3:17.6900 |
| 45th | 58 | Rebaque / Rojas | Porsche 914/6 | Brumos Porsche Audi Corp. | 3:18.000 | 3:18.0000 |
| 46th | 9 | Summers / McClure | Chevrolet Camaro | Endurance Promotions, Inc. | 3:18.170 | 3:18.1700 |
| 47th | 18 | Ingle / Reynolds | Ferrari 365 GTB/4 | Ring Free Oil Racing Team | 3:19.200 | 3:19.2000 |
| 48th | 19 | McClain / White | Porsche 914/6 | David H. McClain | 3:19.570 | 3:19.5700 |
| 49th | 78 | Muniz / Luis / Novoa | Porsche 914/6 | Daniel Muniz | 3:20.120 | 3:20.1200 |
| 50th | 89 | Smith / Gafford | Chevrolet Camaro | Rinzler Motoracing, Inc. | 3:20.230 | 3:20.2300 |
| 51st | 15 | Bean / Pentecost / *Torgersen | Porsche 911 S | Toad Hall Racing | 3:20.640 | 3:20.6400 |
| 52nd | 30 | Quintana / Belperche | Shelby GT350 | Florida Tire Co., Inc. | 3:21.790 | 3:21.7900 |
| 53rd | 46 | Potter / Ansley / Hood | Ford Mustang | Sebring Racing Inc. | 3:21.960 | 3:21.9600 |
| 54th | 69 | Oest / Tillson / Holbert | Porsche 911 T | Holbert's Porsche-Audi Inc. | 3:22.450 | 3:22.4500 |
| 55th | 41 | Kirill / Norburn | Porsche 911 S | Kirill Racing | 3:22.910 | 3:22.9100 |
| 56th | 76 | Stone / Poole | Porsche 911 T | Silverstone Racing Team | 3:23.500 | 3:23.5000 |
| 57th | 42 | Noseda / Garcia / Livingston | Chevrolet Camaro | Garcia Racing | 3:24.340 | 3:24.3400 |
| 58th | 77 | Jennings / Beasley | Porsche 911 S | Bruce Jennings | 3:26.700 | 3:26.7000 |
| 59th | 73 | Ross / Groleau | Datsun 240Z | Ross Racing Ltd. | 3:31.200 | 3:31.2000 |
| 60th | 33 | Vaccarella / Hezemans | Alfa Romeo T33/TT/3 | Autodelta, S.p.A. | 3:42.750 | 3:42.7500 |