| 1st | 61 | Busby / Gregg | Porsche 934/5 | Brumos Racing | 2:47.003 | 2:47.0030 |
| 2nd | 0 | Ongais / Field / Haywood | Porsche 934/5 | Vasek Polak/Interscope Racing | 2:47.619 | 2:47.6190 |
| 3rd | 76 | Greenwood / Greenwood / Mancuso | Chevrolet Corvette | Mancuso Chevrolet | 2:49.483 | 2:49.4830 |
| 4th | 09 | Gunn / Belcher | Porsche 934/5 | Belcher Racing | 2:50.070 | 2:50.0700 |
| 5th | 68 | Currin / Hay / Hoskins | Chevrolet Corvette | Rick Hay | 2:54.560 | 2:54.5600 |
| 6th | 05 | Trueman / Thompson / Yenko | Chevrolet Monza | Red Roof Inns, Inc. | 2:55.295 | 2:55.2950 |
| 7th | 30 | Dyer / Frisselle | Porsche 911 Carrera RSR 3.0 | George Dyer Racing | 2:55.426 | 2:55.4260 |
| 8th | 15 | Garcia / Baldwin / Garcia | Chevrolet Corvette | Javier Garcia | 2:55.790 | 2:55.7900 |
| 9th | 38 | Paul / *O'Steen / *Graves / *Hagestad | Porsche Carrera RSR | John Paul Sr. | 2:58.499 | 2:58.4990 |
| 10th | 65 | Morton / Carradine | Ferrari 365 GTB/4 | Modena Sports Cars | 2:58.799 | 2:58.7990 |
| 11th | 58 | Febles / Cruz | Porsche 911 Carrera RSR | Diego Febles Racing | 2:59.561 | 2:59.5610 |
| 12th | 86 | Kleinpeter / Stevens | De Tomaso Pantera | H. I. Kleinpeter | 2:59.567 | 2:59.5670 |
| 13th | 8 | Beasley / Stone | Porsche Carrera RSR | Bob Beasley | 3:00.213 | 3:00.2130 |
| 14th | 64 | Bondurant / Smothers / Minter | Ferrari 365 GTB/4 | Ramsey Ferrari of SF | 3:00.497 | 3:00.4970 |
| 15th | 40 | Heinz / Shulnburg / *Brandt | Chevrolet Corvette | Shulnburg Scrap Metal | 3:00.674 | 3:00.6740 |
| 16th | 24 | Frank / Shafer | Porsche Carrera RSR | Executive Industries | 3:01.271 | 3:01.2710 |
| 17th | 07 | Mendez / Cowart | Porsche Carrera RSR | Morrison's Inc. | 3:02.187 | 3:02.1870 |
| 18th | 66 | Noseda / Small / Loving | Chevrolet Camaro | Ralph Noseda | 3:03.618 | 3:03.6180 |
| 19th | 9 | Bartling / Bytzek | Porsche Carrera RSR | Bytzek Automotive | 3:03.661 | 3:03.6610 |
| 20th | 41 | Jones, Jr. / Faul | Chevrolet Camaro | Jones Ind. Racing | 3:04.112 | 3:04.1120 |
| 21st | 48 | Carusso / Sereix / Donaldson / *St. James | Chevrolet Corvette | Autodyne | 3:04.878 | 3:04.8780 |
| 22nd | 46 | DeNarvaez / Naon | Porsche 911 Carrera RSR | Mauricio DeNarvaez | 3:05.101 | 3:05.1010 |
| 23rd | 67 | White / McClain | Porsche 911 S | Havatampa Cigars | 3:05.226 | 3:05.2260 |
| 24th | 72 | Arnold / Hagan | Chevrolet Corvette | Bill Arnold | 3:06.736 | 3:06.7360 |
| 25th | 1 | Keyser / Jones / *O'Steen / *Kendrick / *Haywood | Ferrari 365 GTB/4 | Harry Jones | 3:07.103 | 3:07.1030 |
| 26th | 80 | Lang / Solomone | Chevrolet Camaro | Carmon Solomone | 3:08.039 | 3:08.0390 |
| 27th | 60 | Bond / Tilton / *Thomas | Porsche 911 S | R & R Racing | 3:08.063 | 3:08.0630 |
| 28th | 88 | Borsos / *Aase | Porsche 911 S | | 3:08.094 | 3:08.0940 |
| 29th | 01 | Bergstrom / Cook | Porsche 911 S | Sports Ltd. Racing | 3:08.272 | 3:08.2720 |
| 30th | 57 | Tunstall / *Wade | Porsche Carrera RSR | Starbrite | 3:09.635 | 3:09.6350 |
| 31st | 39 | Doran / Barnett / Pelz | Chevrolet Corvette | Wiley Doran | 3:10.100 | 3:10.1000 |
| 32nd | 51 | Kirby / Hotchkis | Porsche 914/6 | Kirby-Hitchcock Racing | 3:11.708 | 3:11.7080 |
| 33rd | 92 | Tillson / Olimpi | Porsche Carrera | Mike Tillson Motor Racing | 3:12.366 | 3:12.3660 |
| 34th | 71 | Bagley / Mead / *Knab | Porsche 911 S | The Foreign Exchange | 3:14.809 | 3:14.8090 |
| 35th | 06 | Panaccione / Mesnick / Roehrig | Porsche 911 T | Morrison's Inc. | 3:14.951 | 3:14.9510 |
| 36th | 19 | Felton / Bostyan / *Kessler | Chevrolet Corvette | Richard Bostyan | 3:14.989 | 3:14.9890 |
| 37th | 85 | Hulen / Coupland / Causey | Porsche 914/6 | John Hulen | 3:15.072 | 3:15.0720 |
| 38th | 77 | Jennings / Bean | Porsche 911 S | Bruce Jennings | 3:15.759 | 3:15.7590 |
| 39th | 49 | Fillingham / Jones / Williamson / *Schmidt | Chevrolet Corvette | Fillingham Racing | 3:15.791 | 3:15.7910 |
| 40th | 17 | Chitwood / Gimondo / Chitwood | Chevrolet Nova | Chitwood Racing | 3:15.837 | 3:18.9510 |
| 41st | 2 | Freeman / Newman | Porsche 911 S | Bill Freeman | 3:16.077 | 3:16.0770 |
| 42nd | 11 | Nylander / Nylander / Hammond | Porsche 911 S | Motoring Enthusiasts | 3:16.684 | 3:16.6840 |
| 43rd | 18 | Swanson / Miller | Chevrolet Camaro | Terry Wolters | 3:16.917 | 3:16.9170 |
| 44th | 78 | Francis / Matienzo / Nowling | Chevrolet Camaro | | 3:17.813 | 3:17.8130 |
| 45th | 10 | Berner / Goebbels | Porsche Carrera | Motex Auto | 3:18.293 | 3:18.2930 |
| 46th | 55 | Fitzgerald / Thompkins | Chevrolet Corvette | Rick Thompkins | 3:19.043 | 3:19.0430 |
| 47th | 73 | Howey / Koch / Crabtree | Chevrolet Corvette | Howey Farms | 3:19.944 | 3:19.9440 |
| 48th | 54 | Sahlman / Henn / Cook | Porsche 914/6 | Spirit Racing | 3:21.230 | 3:21.2300 |
| 49th | 94 | Ansley / Gano / Connelly | Chevrolet Corvette | Tony Ansley | 3:21.752 | 3:21.7520 |
| 50th | 36 | Almeida / Rodriguez / Quintana | Chevrolet Camaro | Motorcito Racing | 3:22.496 | 3:22.4960 |
| 51st | 50 | Hirsch / Hochreuter / Brezinka | Porsche 911 S | Motex Auto | 3:24.306 | 3:24.3060 |
| 52nd | 29 | Fernandez / Godinez / Ferrer | Lotus Elan | Bonky Fernandez | 3:24.310 | 3:24.3100 |
| 53rd | 99 | Shafer / Shafer / Scott / *Crookston | Datsun 240Z | George Shafer/Craig Shafer | 3:26.290 | 3:26.2900 |
| 54th | 5 | Vazquez / Wolfe / *Weiss | Porsche 911 S | Pedro Vazquez | 3:28.070 | 3:28.0700 |
| 55th | 08 | Wolters / Pleasants | Porsche 911 S | Busch Beer | 3:29.346 | 3:29.3460 |
| 56th | 70 | Speer / Turley / *Sahlman | Porsche 911 S | Race Car | 3:30.487 | 3:30.4870 |
| 57th | 37 | Walriven / Helson | Chevrolet Camaro | | 3:30.609 | 3:30.6090 |
| 58th | 22 | King / Lehew / *Lehew | Datsun 240Z | Angel's Auto World | 3:31.856 | 3:31.8560 |
| 59th | 20 | DiLella / Cueto | Porsche 914/4 | Vince DiLella | 3:32.123 | 3:32.1230 |
| 60th | 82 | Ross / Tavilla | Ford Mustang | Tom Ross | 3:32.193 | 3:32.1930 |
| 61st | 7 | Arutunoff / Marina / Goellnicht | Lancia Stratos | Hallet Motor Racing Circuit | 3:36.554 | 3:36.5540 |
| 62nd | 44 | Potter / Boyer | Ford Mustang | Neil Potter | 3:41.155 | 3:41.1550 |
| 63rd | 31 | Bowden / Tumbleston / LaGrow | Chevrolet Camaro | Kenneth LaGrow | 3:42.275 | 3:42.2750 |
| 64th | 93 | Tolman / Fitzgerald / Brockman | Lotus Europa | Ralph Tolman | 3:42.986 | 3:42.9860 |
| 65th | 4 | Leuzinger / Redszus / Van der Werff | De Tomaso Pantera | B. R. Racing | 3:44.477 | 3:44.4770 |
| 66th | 28 | Budd / Johnston / *Spruell | Alfa Romeo Alfetta | Paul Spruell | 3:47.084 | 3:47.0840 |
| 67th | 03 | Oyler / Muratti / Smit / *Pesquera | Renault R12 | | 3:48.772 | 3:48.7720 |
| 68th | 52 | Kleinschmidt / Levetto | MGB GT | Charles Kleinschmidt | 3:53.611 | 3:53.6110 |
| 69th | 26 | McAlpine / Smith | Alfa Romeo Alfetta GTV | Alfa Romeo South | 4:03.006 | 4:03.0060 |