| 0 | Case / Panaccione | Case Racing | | Porsche | 911 | | Porsche | GTU |
| 00 | van der Merwe / Duxbury / Martin | Kreepy Krauly Racing (ZA) | Sarel van der Merwe | March | 83G | | Porsche | GTP |
| 01 | Hulse / Kennedy / Cheung | THR Foreign Car (USA) | George Hulse | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 03 | DiLella / Cueto | DiLella Racing (USA) | | Porsche | 911 | | Porsche | GTU |
| 04 | Redman / Bedard / *Fuerstenau | Group 44 (USA) | | Jaguar | XJR-5 | | Jaguar | GTP |
| 05 | Almeida / Morejon | Hi-Tech Racing (USA) | Bill McDill | Porsche | 935 | M16 | Porsche | GTP |
| 09 | Van Every / Tisdelle | Van Every Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 2 | Leon / Leon / *Wolters | Leon Bros. Racing (USA) | Leon Brothers | March | 84G | | Chevrolet | GTP |
| 3 | Madren / Speer / *Pickering | Pegasus Racing (USA) | | March | 84G | | Buick | GTP |
| 4 | Hagan / Felton / Labonte | Stratagraph Inc. (USA) | Billy Hagan | Chevrolet | Camaro | III | Chevrolet | GTO |
| 5 | Akin / Stuck / O'Steen | Bob Akin Motor Racing (USA) | Bob Akin | Porsche | 935 | -84 | Porsche | GTP |
| 6 | Bell / Foyt / Wollek | Henn's Swap Shop (USA) | Preston Henn | Porsche | 935 | L | Porsche | GTP |
| 7 | Tilton / Pridgen / Bond | E. J. Pruitt & Sons | | Porsche | 911 | | Porsche | GTU |
| 8 | Canary / Wietzes | Paul Canary Racing (USA) | | McLaren | M12 GT | | Chevrolet | GTP |
| 9 | Baker / Mullen / Blackaller | Hino Truck (USA) | Wayne Baker | Porsche | 935 | K3 | Porsche | GTP |
| 10 | White / Drolsom / Kendall | Dave White Racing | | Porsche | 924 | Carrera GTR | Porsche | GTU |
| 11 | Kreider / Newsome / Diehl | Kreider Racing | | Chevrolet | Camaro | | Chevrolet | GTO |
| 13 | Rubino / Rodriguez / Leira | Rubino Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 14 | Wollek / Graham / Gralia / Henn / Holbert | John Fitzpatrick Racing (GB) | John Fitzpatrick | Porsche | 935 | K4 | Porsche | GTP |
| 15 | Kalagian / Lloyd | Kalagian/Ardisana (USA) | John Kalagian | Lola | T600 | | Chevrolet | GTP |
| 16 | Marty Hinze | Hinze Fencing (USA) | Marty Hinze | March | 82G | | Chevrolet | GTP |
| 17 | Bacon / Guest | Al Bacon Racing (USA) | Al Bacon | Mazda | RX-7 | | Mazda | GTU |
| 18 | Welti / "Fomfor" / Valiente | Team Fomfor Racing (ES) | "Fomfor" | Sauber | C7 | | BMW | GTP |
| 19 | Tumbleston / Dumont | Signal 12 Racing | | AMC | Spirit | | | GTO |
| 20 | Canary / *Barnett | Paul Canary Racing (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 21 | Allen / Schwarz / Schwartz | Oftedahl Racing (USA) | Gordon Oftedahl | Pontiac | Firebird | | Pontiac | GTO |
| 22 | Figaro / Sabino | Walter Johnston (USA) | | Pontiac | Firebird | | Pontiac | GTO |
| 23 | Selby / Roe | Roe-Selby Racing (USA) | | Porsche | 914 | /6 | Porsche | GTU |
| 24 | Speer / Griffin / *Hefner | Pegasus Racing (USA) | Martin L. Speer | Porsche | 935 | JLP-2 | Porsche | GTP |
| 25 | Cowart / Miller | Red Lobster Racing (USA) | David Cowart | March | 82G | | Porsche | GTP |
| 26 | Boyer / Roberts | Steve Roberts | | Chevrolet | Camaro | | Chevrolet | GTO |
| 27 | Fowells / Mummery / Potter | Scuderia Rosso (USA) | Jim Fowells | Mazda | RX-7 | | Mazda | GTU |
| 28 | Jellinek / Edlis / Brennan | Budweiser Racing | | Porsche | 924 | Carrera GTR | Porsche | GTU |
| 30 | Chitwood / *Llauget / *Rios | Tim Chitwood | | Chevrolet | Monte Carlo | | Chevrolet | GTP |
| 31 | O'Brien / Van Steenburg | Import Service Center | | Mazda | OVS-1 | | Mazda | GTP |
| 32 | Alderman / Baird / Price | Alderman Datsun (USA) | George Alderman | Datsun | 280ZX | | Datsun | GTU |
| 33 | McComb / *Pettey | John McComb (USA) | | Jaguar | XJS | | Jaguar | GTO |
| 34 | Flores / Turner | Florco Design (USA) | | Lotus | Europa | | | GTU |
| 35 | Williams / Leeward / *Zwiren | G & H Development (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 37 | Welter / *Burdsall / *Northam | Vero Racing | | Mazda | RX-7 | | Mazda | GTU |
| 38 | Mandeville / Johnson / Smith | Mandeville Auto/Tech (USA) | Roger Mandeville | Mazda | RX-7 | | Mazda | GTO |
| 40 | Bieri / Gysler / Pallavicini | Bieri Racing (CDN) | | BMW | M1 | | BMW | GTO |
| 41 | Belcher / Rondeau / Gunn | Silver Lake Plantation | | Rondeau | M382 | | Chevrolet | GTP |
| 42 | Cason / Uria / *Wonzer | Gary Wonzer (USA) | Gary Wonzer | Porsche | 911 | S | Porsche | GTU |
| 43 | Montoya / Goellnicht / Roe | Walker Brown Racing (USA) | | BMW | M1 | | BMW | GTO |
| 44 | Tullius / Bundy | Group 44 (USA) | | Jaguar | XJR-5 | | Jaguar | GTP |
| 45 | Morton / Garcia / Adamowicz | Conte Racing (USA) | Phil Conte | Lola | T600 | | Chevrolet | GTP |
| 46 | Jellinek / Fassler / Molnar | Classic Motor Car (USA) | | Pontiac | Firebird | | Pontiac | GTO |
| 47 | Dingman / Bohren | Dingman Brothers Racing (USA) | Dingman Brothers | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 48 | DeNarvaez / Heyer / Johansson | De Narvaez Enterprises (CO) | Mauricio DeNarvaez | Porsche | 935 | J | Porsche | GTP |
| 49 | Goral / *Hayes-Harlow | Paul Goral (USA) | Paul Goral | Porsche | 935 | | Porsche | GTP |
| 51 | McDonald / DeFranceschi | Chris Wilder | Chris Wilder | Porsche | 911 | S | Porsche | GTU |
| 52 | Overbagh / *Theall / *Kirill | OMR Engines (USA) | Hoyt Overbagh | Chevrolet | Camaro | III | Chevrolet | GTO |
| 53 | Nooe / O'Doski | Dan Nooe | | Chevrolet | Corvette | | Chevrolet | GTO |
| 55 | Ganz / Hackman | Preston & Son | | Mazda | RX-7 | | Mazda | GTU |
| 56 | Borlase / Hammond / *Kravig | Coin Operated Racing (USA) | Rick Borlase | Porsche | 934 | | Porsche | GTO |
| 57 | Lanier / Whittington / Hinze | Blue Thunder Racing Team (USA) | | March | 83G | | Chevrolet | GTP |
| 58 | Mena / Trueman / *Gregg | El Salvador Racing (ES) | | Porsche | 924 | Carrera GTR | Porsche | GTU |
| 60 | Krueger / Henrickson / Kinner | Roserace/Morrison | | Mazda | RX-7 | | Mazda | GTU |
| 61 | Courtney / O'Neill / *Shelton | Deco Sales (USA) | Brent O'Neill | Argo | JM16 | | Ford | GTP |
| 62 | Morgan / Morgan / Bair / Opie | Tim Morgan | | Chevrolet | Corvette | | Chevrolet | GTO |
| 63 | Maffucci / *Downing | RGP 500 Racing (USA) | Jim Downing | Argo | JM16 | | Mazda | GTP |
| 64 | Coupland / Hulen / *Hartill | John Hulen (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 65 | Habersin / Murray | Richard Habersin | | Chevrolet | Camaro | | Chevrolet | GTP |
| 66 | Dunham / Lewis / *Kline | Mike Meyer Racing (USA) | Mike Meyer | Mazda | RX-7 | | Mazda | GTU |
| 67 | Shafer / Shafer / Maloy | Shafer Concrete (USA) | Craig Shafer | Chevrolet | Camaro | II | Chevrolet | GTO |
| 68 | Mendez / Soldevilla / Marte | Luis Mendez Racing (DR) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 69 | Hofstra / Uria / Robinson | George Shafer | | Porsche | 911 | | Porsche | GTU |
| 71 | Higgins / King / Cherry | THR Foreign Car (USA) | | Porsche | 911 | | Porsche | GTU |
| 76 | Baldwin / Young / Reed | Malibu Grand Prix (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 77 | Loving / Small | Sunrise Auto Parts | | Chevrolet | Camaro | | Chevrolet | GTO |
| 78 | Bitterauf / Smith / *Albanese | Der Klaus Haus | | Porsche | 911 | | Porsche | GTU |
| 79 | Winters / Bergstrom / *Adam | Whitehall Promotions (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTU |
| 82 | Mueller / Visger / Casey | Trinity Racing (USA) | Casey/Haggard | Mazda | RX-7 | | Mazda | GTU |
| 83 | Keck / Whitaker / Wessel | K & P Racing (USA) | Karl Keck | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 84 | Young / Grunnet / Burt | Dole Fresh Fruit Racing (USA) | Clay Young | Pontiac | Fiero | | Pontiac | GTU |
| 85 | Fonseca / "Jamsal" / Febles | Latino Racing (CR) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 86 | Holbert / Ballot-Léna / Haywood | Bayside - Lowenbrau (USA) | Bruce Leven | Porsche | 935 | /80 | Porsche | GTP |
| 87 | Forbes-Robinson / *Schneider | Performance Motorsports (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTU |
| 88 | Murray / Boy / Valentine | Motorsports Marketing | Ken Murray | Chevrolet | Camaro | | Chevrolet | GTO |
| 90 | Lee / Myers / Julian | Bob's Speed Products | | Buick | Skyhawk | | Buick | GTO |
| 91 | Bryant / Burr / Graham | B & G Racing | Charles Bryant/Mike Graham | BMW | 2002 | | BMW | GTU |
| 92 | Amar / Mohammed | Amar Racing Team (TT) | | Toyota | Corolla | | Toyota | GTU |
| 93 | Marsh / Pawley / Marsh / Ganz | Mid-O Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 94 | Gardner / Durovy / *Gardner | Tangent Racing | | Pontiac | Firebird | | Pontiac | GTO |
| 95 | Gordillo / Salguero / Villa | Pennzoil de P. R. | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 96 | Ballot-Léna / *Andruet | Tide & Mosler Racing | | Ferrari | 512 BB | /LM | Ferrari | GTP |
| 97 | Shelton / Shelton / Ballot-Léna / McComb / *Davis | Tide & Mosler Racing (USA) | Warren Mosler | Ferrari | 512 BB | /LM | Ferrari | GTP |
| 98 | Sesana / Cortes | Sesana Racing (CO) | | Chevrolet | Monza | | Chevrolet | GTO |
| 99 | Currin / Gentile / Cook / Morrison | Comp Fibreglass | Bard Boand | Chevrolet | Corvette | | Chevrolet | GTO |