| 1st | 0 | Field / Ongais / Haywood | Porsche 935/79 | Interscope Racing | 684 | 4227.0391 kms | 176.0767 | | 1st | GTX | +2000/Gr.5 |
| 2nd | 65 | Morton / Adamowicz | Ferrari 365 GTB/4 | Modena Sports Cars | 635 | | | | 1st | GTO | +2000/Gr.5 |
| 3rd | 11 | Canepa / Mears / Shelton | Porsche 935 | Bruce Canepa | 627 | | | | 2nd | GTX | +2000/Gr.5 |
| 4th | 94 | Whittington / Whittington / Barth | Porsche 935/79 | Whittington Bros. Racing | 622 | | | | 3rd | GTX | +2000/Gr.5 |
| 5th | 7 | Katayama / Terada / Yorino | Mazda RX-7 | Mazda Technical Center | 617 | | | | 1st | GTU | |
| 6th | 77 | Bohren / Johnson / Mandeville | Mazda RX-7 | Mazda Technical Center | 615 | | | | 2nd | GTU | |
| 7th | 60 | Bond / Tilton | Porsche 911 | E. J. Pruitt & Sons | 612 | | | | 3rd | GTU | |
| 8th | 54 | Garcia / Montalvo / Vadia | Porsche Carrera RSR | Montura Ranch Estates | 587 | | | | 2nd | GTO | |
| 9th | 98 | Van Every / Tisdelle / Overby | Porsche Carrera RSR | Van Every Racing | 579 | | | | 3rd | GTO | |
| 10th | 03 | Calderari / Pallavicini / Vanoli | Porsche 934 | Lubrifilm Racing | 577 | | | | 4th | GTO | |
| 11th | 75 | Ramirez / Villa / Gordillo | Porsche 911 | Mike Ramirez | 560 | | | | 4th | GTU | |
| 12th | 37 | Espinosa / Lopez / Cortes | Porsche Carrera RSR | Botero Racing | 551 | | | | 5th | GTO | |
| 13th | 33 | Welter / Aten / Refenning | Porsche 911 | Peter Welter | 550 | | | | 5th | GTU | |
| 14th | 58 | Febles / Currin | Porsche 911 Carrera RSR | Diego Febles Racing | 543 | | | | 6th | GTO | |
| 15th | 5 | Mendez / Rutherford / Miller | Porsche 935 | Budweiser Racing | 529 | | | Rear suspension | 4th | GTX | |
| 16th | 27 | Mummery / Sheehy / Sereix | Porsche 911 S | Miami Auto Racing | 522 | | | Differential | 6th | GTU | |
| 17th | 62 | Koll / Cook | Porsche 914/6 | Koll Motorsports | 511 | | | DNF | 7th | GTU | |
| 18th | 95 | Bond / Dann | Chevrolet Monza | Stephen E. Bond | 509 | | | | 7th | GTO | |
| 19th | 21 | Wood / Bagley / Shafer | Chevrolet Camaro | Oftedahl Racing | 493 | | | | 8th | GTO | |
| 20th | 42 | Ashby / Bean / Beasley | Porsche 911 | Bullwinkele Racing, Inc. | 493 | | | | 8th | GTU | |
| 21st | 08 | Wolters / Northam / Weiss | Porsche 911 | Southern Racing Ent. | 488 | | | | 9th | GTU | |
| 22nd | 34 | Drolsom / Greb / Maffucci | Porsche 911 | Drolsom Racing | 482 | | | | 10th | GTU | |
| 23rd | 64 | Canada / Boykin / Ciccone | Chevrolet Camaro | Lenton B. McGill | 458 | | | | 9th | GTO | |
| 24th | 61 | Cosentino / Starita / Akaike | Mazda RX-3 | Faza Squadra | 444 | | | | 11th | GTU | |
| 25th | 8 | Arutunoff / Marina / Sullivan | Lancia Stratos | Automobiles International Inc. | 439 | | | DNF | 12th | GTU | |
| 26th | 6 | Barbour / Redman / Newman | Porsche 935/77A | Dick Barbour Racing | 410 | | | Dropped valve | 5th | GTX | |
| 27th | 80 | Adams / Frey / Spoerl | Pontiac Firebird | Herb Adams | 408 | | | Oil pressure | 10th | GTO | |
| 28th | 17 | Mederer / Sherman / Kline | Mazda RX-7 | Racing Beat | 393 | | | DNF | 13th | GTU | |
| 29th | 93 | Whittington / Whittington / Henn | Porsche 934 | Whittington Bros. Racing | 389 | | | Accident | 11th | GTO | |
| 30th | 71 | Scott / Hutchins / Honegger | Porsche 911 | Bill Scott Racing | 388 | | | DNF | 14th | GTU | |
| 31st | 40 | Southard / Koch / Roe | Porsche 914/6 | Performance Specialists | 385 | | | DNF | 15th | GTU | |
| 32nd | 1 | Wollek / Ickx / Gregg | Porsche 935/77A | Gelo Racing Team | 342 | | | Valves | 6th | GTX | |
| 33rd | 69 | Bytzek / Bartling / Heimrath | Porsche Carrera RSR | Bytzek Automotive | 335 | | | Oil system | 12th | GTO | |
| 34th | 29 | Hagan / Overbagh / Reed | Chevrolet Monza | Stratagraph Inc. | 331 | | | DNF | 13th | GTO | |
| 35th | 89 | Hamilton / Hoskins / Forrest | Porsche 911 | Hamilton House Racing | 329 | | | DNF | 16th | GTU | |
| 36th | 51 | Kirby / Hotchkis / Meister | Porsche Carrera RSR | Casablanca Fan Co. | 328 | | | DNF | 14th | GTO | |
| 37th | 15 | Gebhardt / Grinbold | BMW CSL | Bavarian Motors International | 299 | | | DNF | 15th | GTO | |
| 38th | 81 | Soto / Romero / Notz | Porsche 911 Carrera RSR | Performance Export | 241 | | | DNF | 16th | GTO | |
| 39th | 01 | White / Roehrig / Hamilton | Porsche 911 | D. R. Racing | 223 | | | DNF | 17th | GTU | |
| 40th | 13 | Shaw, Jr. / Spalding / Ridgely | Porsche 935 | Hal Shaw Racing | 222 | | | Turbocharger | 7th | GTX | |
| 41st | 36 | Case / Panaccione | Porsche 911 | Case Racing | 210 | | | DNF | 18th | GTU | |
| 42nd | 53 | Thomas / Moise / Nehl | Chevrolet Camaro | Guy Thomas | 201 | | | | 8th | GTX | |
| 43rd | 06 | Levenson / Baker / Hester | Chevrolet Corvette | Al Levenson | 197 | | | DNF | 17th | GTO | |
| 44th | 23 | Kemp / Baird / Nierop | Ford Cobra II | Charlie Kemp | 168 | | | DNF | 9th | GTX | |
| 45th | 3 | Finotto / Facetti / Moretti | Porsche 935 | Jolly Club - Sportwagen Racing Team | 164 | | | Engine | 10th | GTX | |
| 46th | 4 | Jöst / Stommelen / Merl | Porsche 935/77A | LM Joest Porsche | 162 | | | Engine | 11th | GTX | +2000/Gr.5 |
| 47th | 90 | Kump / Lee / Miller | AMC AMX | Bob's Speed Products | 156 | | | DNF | 18th | GTO | |
| 48th | 12 | Wellik / Bagley / Chamberlain | Chevrolet Camaro | Oftedahl Racing | 147 | | | DNF | 19th | GTO | |
| 49th | 56 | Carter / Edwards / Valentine | Chevrolet Camaro | Peerless Racing | 144 | | | DNF | 20th | GTO | |
| 50th | 2 | Schurti / Fitzpatrick / Wollek | Porsche 935/77A | Gelo Racing Team | 135 | | | Valves | 12th | GTX | +2000/Gr.5 |
| 51st | 57 | Tremblay / Lapp | Datsun 240Z | John Tremblay | 118 | | | Gearbox | 19th | GTU | |
| 52nd | 9 | Akin / McFarlin / Woods | Porsche 935 | Dick Barbour Racing | 117 | | | Engine | 13th | GTX | |
| 53rd | 66 | Andruet / Dini / Ballot-Léna | Ferrari 512 BB | JMS Racing-Pozzi | 103 | | | Withdrawn after Delaunay's accident | 14th | GTX | +2000/Gr.5 |
| 54th | 67 | Ballot-Léna / Leclère / Andruet | Ferrari 512 BB | JMS Racing-Pozzi | 101 | | | Withdrawn after Delaunay's accident | 15th | GTX | +2000/Gr.5 |
| 55th | 24 | Shaw / Yenko / Thompson | Chevrolet Monza | Graham Shaw | 86 | | | DNF | 16th | GTX | |
| 56th | 38 | Fernandez / Soldevilla / Ferrer | Porsche Carrera RSR | Boricua Racing | 73 | | | DNF | 21st | GTO | |
| 57th | 68 | Tullius / Delaunay / Bedard | Ferrari 512 BB | N.A.R.T. | 72 | | | Accident | 17th | GTX | +2000/Gr.5 |
| 58th | 43 | McDill / Behr | Chevrolet Camaro | Meldeau Tire Co. | 59 | | | DNF | 18th | GTX | |
| 59th | 46 | DeNarvaez / Naon / DeNarvaez | Porsche 911 Carrera RSR | Mauricio De Narvaez | 46 | | | DNF | 22nd | GTO | |
| 60th | 07 | Cowart / McClain / Miller | Porsche Carrera RSR | Budweiser Racing | 35 | | | DNF | 23rd | GTO | |
| 61st | 00 | Henn | Porsche 935/77A | Interscope Racing | 29 | | | Accident | 19th | GTX | |
| 62nd | 14 | Griswold | BMW CSL | Bavarian Motors International | 25 | | | Cooling system | 20th | GTX | |
| 63rd | 96 | Wonzer | Triumph GT6 | Gary Wonzer | 20 | | | Electrics | 20th | GTU | |
| 64th | 48 | Leary | Datsun 240Z | Frank L. Leary, III | 13 | | | Cooling system | 21st | GTU | |
| 65th | 18 | Paul | Porsche 935 JLP-1 | JLP Racing | 12 | | | Electrics | 21st | GTX | |
| 66th | 79 | Bergstrom | Mazda RX-7 | Sports Ltd. Racing | 9 | | | Suspension | 22nd | GTU | |
| 67th | 73 | Howey | Chevrolet Camaro | Howey Farms | 4 | | | DNF | 22nd | GTX | |