| 1st | 6 | Rolf Stommelen / Dick Barbour / Rick Mears | Porsche 935/77A | Dick Barbour Racing | 2:38.0380 |
| 2nd | 09 | Hurley Haywood / Preston Henn / Peter Gregg | Porsche 935/77A | Thunderbird Swap-Shop | 2:39.9120 |
| 3rd | 18 | John Paul / Al Holbert | Porsche 935 JLP-1 | JLP Racing | 2:40.1900 |
| 4th | 5 | Charles Mendez / Brian Redman / Paul Miller | Porsche 935 | Busch Beer Racing | 2:44.4350 |
| 5th | 00 | Ted Field / Danny Ongais | Porsche 935/77A | Interscope Racing | 2:45.9290 |
| 6th | 94 | Bill Whittington / Don Whittington | Porsche 935/79 | Whittington Bros. Racing | 2:46.2360 |
| 7th | 3 | Bob Garretson / Gary Belcher / Bob Bondurant | Porsche 935 | Dick Barbour Racing | 2:50.1790 |
| 8th | 7 | Ludwig Heimrath | Porsche 935 | Heimrath Racing | 2:50.5090 |
| 9th | 9 | Bob Akin / Rob McFarlin / Roy Woods | Porsche 935 | Dick Barbour Racing | 2:51.3880 |
| 10th | 97 | Ricardo Londono / George Garces / John Gunn | Porsche 935 | Ricardo Londono | 2:48.0170 |
| 11th | 28 | Clif Kearns / Gianpiero Moretti | Porsche 935 | Desperado Racing | 2:51.7990 |
| 12th | 46 | Mauricio DeNarvaez / Albert Naon | Porsche 911 Carrera RSR | Mauricio deNarvaez | 2:55.9420 |
| 13th | 92 | Dale Whittington / R. D. Whittington / Milt Minter | Porsche 934 | Whittington Bros. Racing | 2:56.3620 |
| 14th | 13 | Hal Shaw, Jr. / Norm Ridgely | Porsche 935 | Hal Shaw Racing | 2:57.3420 |
| 15th | 89 | Francisco Romero / Ernesto Soto | Porsche 911 Carrera RSR | Hector Huerta | 2:58.3440 |
| 16th | 38 | Bonky Fernandez / Tato Ferrer / Chiqui Soldevilla | Porsche Carrera RSR | Boricua Racing | 2:59.3060 |
| 17th | 56 | Craig Carter / Murray Edwards / Richard Valentine | Chevrolet Camaro | Peerless Racing | 2:59.3690 |
| 18th | 41 | Herb Jones, Jr. / Dean Hollis | Chevrolet Camaro | Jones Ind. Racing | 2:59.4350 |
| 19th | 91 | Roger Schramm / Werner Frank | Porsche Carrera RSR | Framm Promotions | 2:59.8360 |
| 20th | 62 | Bill Koll / Jim Cook / Dennis Aase | Porsche 914/6 | Koll Motor Sports | 3:00.2830 |
| 21st | 54 | Tony Garcia / Juan Montalvo / Alberto Vadia | Porsche Carrera RSR | Montura Ranch Estates | 3:00.3930 |
| 22nd | 07 | Dave Cowart / Kenper Miller / David McClain | Porsche Carrera RSR | Morrison's | 3:00.9630 |
| 23rd | 58 | Diego Febles / Phil Currin | Porsche 911 Carrera RSR | Diego Febles Racing | 3:01.7810 |
| 24th | 37 | Honorato Espinosa / Francisco Lopez / Jorge Cortes | Porsche Carrera RSR | Botero Racing Team | 3:01.8470 |
| 25th | 43 | Bill McDill / Tom Frank | Chevrolet Camaro | Meldeau Tire Stores | 3:01.9370 |
| 26th | 21 | Carl Shafer | Chevrolet Camaro | Oftedahl/Shafer Farms | 3:02.0590 |
| 27th | 15 | Alf Gebhardt | BMW CSL | Bavarian Motors | 3:02.0800 |
| 28th | 98 | Lance Van Every / Ash Tisdelle | Porsche Carrera RSR | Van Every Racing | 3:02.2830 |
| 29th | 69 | Horst Kroll / Rudy Bartling | Porsche Carrera RSR | Bytzek Automotive | 3:02.6340 |
| 30th | 23 | Charlie Kemp / Kees Nierop / Carson Baird | Ford Cobra II | Kemp Motoracing | 3:03.5900 |
| 31st | 01 | Dave White / Robert Overby | Porsche 911 | Roehrig Racing | 3:04.5520 |
| 32nd | 16 | Darrel Overstreet / Dwight Mitchell | Porsche 914/6 | Overstreet Racing Ent. | 3:05.4870 |
| 33rd | 47 | Tim Chitwood / Joie Chitwood | Chevrolet Nova | Tim Chitwood | 3:06.2330 |
| 34th | 39 | Jim Trueman / John Higgins / Chip Mead | Porsche 911 | Barrick Motor Racing | 3:06.2930 |
| 35th | 2 | Bonnie Henn / Lyn St. James / Janet Guthrie | Ferrari 365 GTB/4 | Thunderbird Swap-Shop | 3:06.8240 |
| 36th | 79 | Bob Bergstrom / Brad Frisselle | Mazda RX-7 | Sports Ltd. Racing | 3:06.8450 |
| 37th | 72 | Bill Scott / Pierre Honegger | Porsche 911 | Bill Scott Racing-Z&W | 3:07.2970 |
| 38th | 70 | Walt Bohren / James Besmer | Mazda RX-7 | Walt Bohren Racing | 3:08.6100 |
| 39th | 85 | John Hulen / Ron Coupland / Bob Speakman | Porsche 914/6 | John E. Hulen | 3:08.8800 |
| 40th | 31 | Hiram Cruz / Juan Lopez / Mandy Gonzalez | Porsche 911 | Hiram Cruz | 3:09.0390 |
| 41st | 77 | Roger Mandeville / Amos Johnson / Jim Downing | Mazda RX-7 | Roger T. Mandeville | 3:09.4050 |
| 42nd | 66 | Jeff Loving / Richard Small / Ralph Noseda | Chevrolet Camaro | Sunset Racing | 3:09.7110 |
| 43rd | 27 | Ray Mummery / Tom Sheehy / Luis Sereix | Porsche 911 S | Miami Auto Racing | 3:09.9160 |
| 44th | 60 | Rusty Bond / Ren Tilton | Porsche 911 | E. J. Pruitt & Sons | 3:10.5380 |
| 45th | 61 | Bill Bean | Mazda RX-3 | Bill Bean | 3:12.0930 |
| 46th | 36 | Ron Case / Dave Panaccione | Porsche 911 | Case Racing | 3:13.1290 |
| 47th | 25 | Bob Zulkowski / Gerard Raney | Porsche 914/6 | Metal Craft Racing | 3:13.3680 |
| 48th | 50 | Rainer Brezinka / Gary Hirsch / Fritz Hochreuter | Porsche 911 | R & H Racing | 3:13.7080 |
| 49th | 33 | Peter Welter / Richard Aten / Jack Refenning | Porsche 911 | Peter Welter | 3:13.7810 |
| 50th | 48 | Sam Fillingham | Chevrolet Corvette | Fillingham Racing | 3:13.9630 |
| 51st | 53 | Guy Thomas / Milton Moise / Tom Nehl | Chevrolet Camaro | Guy F. Thomas | 3:14.4050 |
| 52nd | 44 | George Van Arsdale / Kent Murry | Porsche 911 | SUD Porsche Racing | 3:14.7880 |
| 53rd | 03 | Tico Almeida / Rene Rodriguez / Pepe Romero | Chevrolet Corvette | Motorcito Racing | 3:14.9590 |
| 54th | 40 | Steve Southard | Porsche 914/6 | Performance Specialists | 3:15.8480 |
| 55th | 71 | Bruce Jennings / Bob Beasley | Porsche 911 | Bruce Jennings | 3:16.1890 |
| 56th | 17 | Kenneth LaGrow / William Boyer | Chevrolet Camaro | Kenneth D. LaGrow | 3:16.2910 |
| 57th | 8 | Anatoly Arutunoff / José Marina / Danny Sullivan | Lancia Stratos | Automobiles International | 3:16.7210 |
| 58th | 08 | Terry Wolters / Bob Buchler / Nort Northam | Porsche 911 | Moran Construction | 3:17.2690 |
| 59th | 81 | Steve Faul / Herb Jones, Jr. / Fred Lang | Chevrolet Corvette | Jones Ind. Racing | 3:17.4250 |
| 60th | 93 | David Deacon / Reagan Riley / Hank Franczak | Porsche 914/6 | M. Rochas Porsche | 3:17.7160 |
| 61st | 51 | Robert Kirby / Wayne Baker / Tom Winters | Porsche 914/4 | Personalized Porsche | 3:19.3750 |
| 62nd | 57 | John Tremblay | Datsun 240Z | J. F. Tremblay | 3:20.4480 |
| 63rd | 52 | Jack Swanson / Dick Gauthier | Chevrolet Camaro | Ours & Hours Racing | 3:20.6480 |
| 64th | 22 | Peter Kirill / Gerry Wellik / Carl Shafer | Chevrolet Camaro | Oftedahl Racing | 3:21.8800 |
| 65th | 34 | George Drolsom / Mark Greb / John Maffucci | Porsche 911 | Drolsom Racing | 3:22.2020 |
| 66th | 67 | Manuel Quintana | Porsche 911 | Quintana Racing | 3:24.2800 |
| 67th | 88 | Dave Yerger / Dario Orlando / Del Russo Taylor | Alfa Romeo GTV | Day Enterprise Racing | 3:25.5490 |
| 68th | 14 | Josele Garza / Bill McVey / Glen Cross | Porsche Carrera | Precision School of Racing | 3:25.5690 |
| 69th | 87 | Mike Williamson / Wayne Miller / Charles Gano | Chevrolet Corvette | U-Mo Racing | 3:24.1050 |
| 70th | 02 | J. Dana Roehrig / J. Kurt Roehrig | Porsche 911 | Roehrig Racing | no time |
| 71st | 29 | Billy Hagan / Hoyt Overbagh / Ron Reed | Chevrolet Monza | Stratagraph | no time |
| 72nd | 75 | Mike Ramirez / Manuel Villa / Luis Gordillo | Porsche 911 | Mike Ramirez | no time |
| 73rd | 4 | Mark Leuzinger | De Tomaso Pantera | B. R. Racing Team | no time |
| 74th | 95 | Stephen Bond / Philip Dann | Chevrolet Monza | Ozone Industries | no time |
| 75th | 04 | Rick Thompkins / Dave Heinz | Chevrolet Corvette | Rick Thompkins | 3:32.0340 |
| 76th | 12 | Ford Smith / Jimmy Tumbleston / Neil Potter | Chevrolet Camaro | Ford Smith Racing | 3:44.3630 |