| 1st | 2 | Jöst / Stommelen / Merl | Porsche 935J | Liqui Moly | 715 | 4418.6152 kms | 183.9529 | | 1st | GTX | +2000/Gr.5 |
| 2nd | 09 | Paul / Holbert | Porsche 935/77A | Thunderbird Swap Shop | 682 | | | | 2nd | GTX | +2000/Gr.5 |
| 3rd | 0 | Field / Ongais / Minter | Porsche 935 K3/80 | Interscope Racing | 664 | | | | 3rd | GTX | +2000/Gr.5 |
| 4th | 80 | Carter / Carter / Edwards | Chevrolet Camaro II | All Canadian Racing | 639 | | | | 4th | GTX | |
| 5th | 62 | Koll / Cook / LaCava | Porsche 914/6 | William J. Koll | 632 | | | | 1st | GTU | |
| 6th | 54 | Garcia / Vadia / Herman | Porsche Carrera RSR | Montura Racing | 630 | | | | 1st | GTO | |
| 7th | 46 | DeNarvaez / Naon / Londono | Porsche 911 Carrera RSR | DeNarvaez Racing | 629 | | | | 2nd | GTO | |
| 8th | 77 | Mandeville / Downing / Frisselle | Mazda RX-7 | Roger Mandeville | 618 | | | | 2nd | GTU | |
| 9th | 9 | McKitterick / Garretson / Verney | Porsche 935 | Dick Barbour Racing | 599 | | | | 5th | GTX | |
| 10th | 4 | Finotto / Facetti | Lancia Beta Montecarlo Turbo | Jolly Club | 597 | | | | 6th | GTX | -2000/Gr.5 |
| 11th | 59 | Gregg / Haywood / Leven | Porsche 935/79 | Brumos Porsche Audi | 584 | | | | 7th | GTX | |
| 12th | 73 | Hutchins / Honegger / Apgar | Mazda RX-7 | Z&W Enterprises | 546 | | | | 3rd | GTU | |
| 13th | 89 | Romero / Libert / Soto | Porsche 911 Carrera RSR | Hector Huerta | 544 | | | | 3rd | GTO | |
| 14th | 65 | Morton / Adamowicz | Ferrari 365 GTB/4 | Nicholas/McRoberts Racing | 539 | | | Stub axle | 4th | GTO | |
| 15th | 78 | Giesel / Nesbitt / Johnson | Mazda RX-2 | Revolution Wheels | 533 | | | | 4th | GTU | |
| 16th | 93 | Whittington / Whittington / Whittington | Porsche 935 K3 | Whittington Bros. | 509 | | | DQ: assistance | 8th | GTX | +2000/Gr.5 |
| 17th | 81 | St. James / Welch / Winters | Mazda RX-7 | Trinity Racing | 498 | | | | 5th | GTU | |
| 18th | 08 | Speer / Ratcliff / Wolters | Porsche 911 | Moran Construction | 489 | | | | 6th | GTU | |
| 19th | 57 | Baker / Gilliland / Scott | Porsche 914/4 | Independent Personalized | 486 | | | | 7th | GTU | |
| 20th | 82 | Casey / Dietrich / Mueller | Mazda RX-7 | Trinity Racing | 483 | | | | 8th | GTU | |
| 21st | 10 | Heinz / Wellik / Young | Chevrolet Camaro II | Oftedahl Trucking | 476 | | | | 5th | GTO | |
| 22nd | 22 | Bruckmann / Goodell / Cunningham | Porsche Carrera | Group Bruckmann | 464 | | | | 6th | GTO | |
| 23rd | 37 | Espinosa / Cortes / Lopez | Porsche Carrera RSR | Botero Racing | 457 | | | | 7th | GTO | |
| 24th | 39 | Moffat / Johnson / Fisher | Mazda RX-7 | JLC Racing | 440 | | | DNF | 9th | GTU | |
| 25th | 28 | Nehl / Kirill / Rude | Chevrolet Camaro | Tom Nehl | 435 | | | Engine | 8th | GTO | |
| 26th | 68 | Mendez / Almeida / Rodriguez | Porsche 911 Carrera RSR | T & R Racing | 423 | | | DNF | 9th | GTO | |
| 27th | 15 | Gebhardt / Beilcke | BMW CSL | Bavarian Motors International | 420 | | | | 10th | GTO | |
| 28th | 92 | Cummings / Levetto | Shelby GT350 | The Cummings Marque | 410 | | | | 11th | GTO | |
| 29th | 6 | Fitzpatrick / Schurti / Barbour | Porsche 935 K3 | Dick Barbour Racing | 405 | | | | 9th | GTX | |
| 30th | 71 | Keirn / Trotter / Errington | Chevrolet Corvette C3 | Keirn Garage | 402 | | | DNF | 12th | GTO | |
| 31st | 76 | Chamberlain / Chamberlain / Valentine | Chevrolet Corvette C3 | Arrow Heating Co. | 393 | | | | 10th | GTX | |
| 32nd | 85 | Deacon / Moennick / Bienvenue | Porsche Carrera | David Deacon | 375 | | | Gearbox | 13th | GTO | |
| 33rd | 06 | DiBattista / Ciccone / Howes | Porsche 911 | Intrepid, Inc. | 358 | | | | 10th | GTU | |
| 34th | 79 | Bergstrom / Bedard | Mazda RX-7 | Sports Ltd. Racing | 355 | | | DNF | 11th | GTU | |
| 35th | 56 | Borlase / Kravig / Hammond | Porsche 911 | Rick Borlase | 348 | | | | 14th | GTO | |
| 36th | 69 | Henn / Dieudonné | Ferrari 512 BB | Preston Henn | 341 | | | Broken tank | 11th | GTX | |
| 37th | 24 | Refenning / Mummery / Tilton | Porsche 934 | American Racing Team | 337 | | | Accident | 15th | GTO | |
| 38th | 52 | Hamilton / Cripe / Snow | Porsche 911 | Snowmobile Racing | 301 | | | Accident | 12th | GTU | |
| 39th | 5 | Mendez / Redman / Miller | Porsche 935 K3 | Racing Associates | 290 | | | Accident | 12th | GTX | |
| 40th | 96 | Earl / Coykendall / Stiff | Datsun 240Z | NTS Racing | 281 | | | Engine | 13th | GTU | |
| 41st | 42 | Neland / Ferran / Cotrone | Chevrolet Camaro | Dick Neland | 270 | | | DNF | 16th | GTO | |
| 42nd | 95 | Ramirez / Villa / Gordillo | Porsche 911 | Mike Ramirez Racing | 263 | | | Engine | 14th | GTU | |
| 43rd | 11 | Korten / Neve / Grob | March-BMW M1 | March Engineering | 260 | | | Drive shaft | 13th | GTX | IMSA GTP |
| 44th | 70 | Doyle / Guest / Meyer | Mazda RX-7 | Herman Racing | 250 | | | DNF | 15th | GTU | |
| 45th | 13 | Forbes-Robinson / Townsend / Meister | Porsche 935 | Andial Racing | 233 | | | Engine | 14th | GTX | |
| 46th | 32 | "Jamsal" / Pineda / Barrientos | Porsche Carrera RSR | Scorpio Racing | 233 | | | DNF | 17th | GTO | |
| 47th | 25 | Miller / Cowart / Beckers | BMW M1 | Deren Automotive | 222 | | | Accident | 15th | GTX | |
| 48th | 55 | Kent-Cooke / Bleynie / Ballot-Léna | Porsche 935 | Racing Associates | 217 | | | Ignition | 16th | GTX | |
| 49th | 38 | Fernandez / Ferrer / Nierop | Porsche Carrera RSR | Boricua Racing | 211 | | | Engine | 18th | GTO | |
| 50th | 19 | Cord / Adams | Chevrolet Monza | Chris Cord Racing | 188 | | | Engine | 17th | GTX | |
| 51st | 94 | Whittington / Plankenhorn | Porsche 935/79 | Whittington Bros. | 179 | | | Engine | 18th | GTX | |
| 52nd | 44 | Tullius / McComb / Kelly | Triumph TR8 | Group 44 | 171 | | | Gearbox | 19th | GTO | |
| 53rd | 75 | Kreider / Hagan / Bond | Chevrolet Corvette C3 | Show Cars of Florida | 170 | | | DNF | 20th | GTO | |
| 54th | 05 | Akin / Woods / Rahal | Porsche 935 K3 | Racing Associates | 156 | | | Engine | 19th | GTX | |
| 55th | 51 | Kirby / Hotchkis / Hotchkis, Jr. | Porsche Carrera RSR | Moana Corp. | 147 | | | DNF | 21st | GTO | |
| 56th | 3 | Busby / Jenner / Knoop | March-BMW M1 | Jim Busby Racing | 139 | | | Drive shaft | 20th | GTX | IMSA GTP |
| 57th | 23 | Devendorf / Davenport / Carney | Datsun 280ZX | Frank L. Carney | 109 | | | Engine | 16th | GTU | |
| 58th | 99 | Phil Currin | Chevrolet Corvette | Full-Time Racing | 89 | | | | 22nd | GTO | |
| 59th | 30 | Moretti | Porsche 935J | Electrodyne | 72 | | | DNF | 21st | GTX | |
| 60th | 58 | Febles | Porsche 911 Carrera RSR | Coco Lopez-Pina Colada | 60 | | | Oil leak | 23rd | GTO | |
| 61st | 16 | Mason | Chevrolet Corvette C3 | Yenko Chevrolet-Honda | 56 | | | DNF | 24th | GTO | |
| 62nd | 17 | Bohren | Mazda RX-7 | Racing Beat | 51 | | | DNF | 17th | GTU | |
| 63rd | 03 | Frank | Porsche 934 | Toyota Village | 51 | | | DNF | 25th | GTO | |
| 64th | 83 | Zitza | Porsche 914/6 | Zotz Garage | 44 | | | DNF | 18th | GTU | |
| 65th | 63 | Northam / Davenport | Chevrolet Camaro | Guy Thomas | 29 | | | DNF | 22nd | GTX | |
| 66th | 07 | Heimrath | Porsche 935 | Heimrath Racing | 24 | | | Engine | 23rd | GTX | |
| 67th | 18 | Arutunoff | Lancia Stratos | Automobile International | 20 | | | Engine | 19th | GTU | |
| 68th | 88 | | Pontiac Firebird Fire-Am | Herb Adams VSE | 0 | | | Engine | 26th | GTO | |