| 0 | Field / Ongais | Interscope Racing (USA) | Ted Field | Porsche | 935 | K3/80 | Porsche | GTX |
| 00 | Ongais / Field | Interscope Racing (USA) | Ted Field | Porsche | 935 | K3/80 | Porsche | GTX |
| 01 | Flaquer / Gonzalez / Dominguez | T & R Racing | | Porsche | 911 Carrera | | Porsche | GTU |
| 02 | Morton / Klausler | Firestone Tire & Rubber (USA) | | Ford | Mustang | | Ford | GTX |
| 03 | Pallavicini / *Crang / *Simpson | Angelo Pallavicini (CH) | | Porsche | 934 | | Porsche | GTO |
| 04 | Rodriguez / Almeida / Morejon | T & R Racing (USA) | Tico Almeida/Rene Rodriguez | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 05 | Flaquer / Gonzalez / Dominguez | Miguel Morejon (USA) | Tico Almeida/Rene Rodriguez | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 07 | Heimrath / Heimrath, Jr. | Heimrath Porsche (CDN) | Ludwig Heimrath | Porsche | 935 | | Porsche | GTX |
| 09 | Henn / Gunn / Belcher | T-Bird Swap Shop (USA) | Preston Henn | Porsche | 935 | K3 | Porsche | GTX |
| 1 | Fitzpatrick / Busby | John Fitzpatrick Racing (GB) | John Fitzpatrick | Porsche | 935 | K3/80 | Porsche | GTX |
| 2 | Hinze / Minter / Whittington | Marty Hinze Racing (USA) | Marty Hinze | Porsche | 935 | K3 | Porsche | GTX |
| 3 | Meister / Stommelen / Grohs | Andial/Meister Racing (USA) | Howard Meister | Porsche | 935 | M16 | Porsche | GTX |
| 4 | Kelly / Bedard | Group 44 (USA) | | Triumph | TR8 | | Rover | GTO |
| 5 | Akin / Bell / Siebert | Bob Akin Motor Racing (USA) | Bob Akin | Porsche | 935 | K3 | Porsche | GTX |
| 7 | Mullen / Zimicki | Loud Car Racing (USA) | Jim Mullen | Mazda | RX-7 | | Mazda | GTU |
| 8 | Paul / Paul, Jr. | JLP Racing (USA) | John Paul | Porsche | 935 | JLP-3 | Porsche | GTX |
| 9 | Garretson / Rahal / Redman | Cooke Woods Racing/Garretson Enterprises (USA) | Bob Garretson | Porsche | 935 | K3/80 | Porsche | GTX |
| 10 | Chitwood / Varde | T. C. Racing | | Chevrolet | Camaro | | Chevrolet | GTO |
| 12 | Tumbleston / Dumont / Smith | Performance Marine Racing | | Chevrolet | Camaro | | Chevrolet | GTO |
| 13 | Lino / *Garcia / *Garcia | Garcia Racing (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 14 | Gebhardt / Surer | BMW Challenge Team | | BMW | M1 | | BMW | GTO |
| 15 | Lutz / Panaccione | D. L. Performance Engineering (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 16 | Grunnet / Burt / Paquette | Corp Racing Ltd. | | Mazda | RX-7 | | Mazda | GTU |
| 18 | Werner Frank | JLP Racing (USA) | John Paul | Porsche | 935 | | Porsche | GTX |
| 19 | Cord / Adams | Chris Cord Racing (USA) | | Chevrolet | Monza | | Chevrolet | GTX |
| 20 | Cord / Adams | Chris Cord Racing (USA) | | Chevrolet | Monza | | Chevrolet | GTX |
| 21 | Aschenbrenner / *Moennick / *Lausberg | Alps Restoration (CDN) | | Porsche | 914 | /6 | Porsche | GTU |
| 22 | Gunn / Canary | Paul Canary Racing (USA) | | McLaren | M12 GT | | Chevrolet | GTX |
| 23 | Selby / Roe | Roe/Selby Racing (USA) | Earl Roe/Tim Selby | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 24 | Refenning / Tilton / Welter | Jack Refenning (USA) | Jack Refenning | Porsche | 934 | | Porsche | GTO |
| 25 | Cowart / Miller | Red Lobster Racing (USA) | | BMW | M1 | | BMW | GTO |
| 27 | LaGrow / Turner | Kenneth LaGrow/Jack Holley | | Chevrolet | Camaro | | Chevrolet | GTX |
| 28 | Posey / Stiff | NTS Racing | | Datsun | 280ZX | Turbo | Datsun | GTO |
| 29 | Northam / Soldevilla | Bill Ferran | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 30 | Moretti / Mendez / DeNarvaez | Momo/Penthouse (I) | Giampiero Moretti | Porsche | 935 | J | Porsche | GTX |
| 31 | Arutunoff / Marina | Hallet Motor Racing Circuit (USA) | Anatoly Arutunoff | Lancia | Stratos | HF | Ferrari | GTU |
| 32 | Alderman / McComb | Alderman Datsun (USA) | | Datsun | 240Z | | Datsun | GTU |
| 34 | Drolsom / Hoskins / Marcus | Drolsom Racing (USA) | George Drolsom | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 35 | Gonzalez / Fernandez / Cochesa | H.S.M. Racing (PR) | Armando Gonzalez | Porsche | 934 | | Porsche | GTO |
| 36 | Bundy / Miller | Herman + Miller P+A (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 37 | Taylor / *Godard / *Cone | Vince Thompson | | Alfa Romeo | GTV | | Alfa Romeo | GTU |
| 38 | Case / *Mummery / *Rynerson | Case Racing | | Porsche | 911 | | Porsche | GTU |
| 39 | Higgins / Mead / Johnson | The Foreign Exchange | | Porsche | 911 | | Porsche | GTU |
| 40 | Deacon / Freberg / Bartling | David Deacon Racing (CDN) | | BMW | M1 | | BMW | GTO |
| 41 | Hagan / Labonte | Stratagraph (USA) | Billy Hagan | Chevrolet | Camaro | II | Chevrolet | GTX |
| 42 | Cotrone / Showket / *Currin / *Donaldson | Cotrone Racing Enterprises (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 43 | Gregg / Young / Varde | Bob Gregg Racing (USA) | Bob Gregg | Porsche | 911 Carrera | | Porsche | GTO |
| 44 | Tullius / Adam | Group 44 (USA) | | Triumph | TR8 | | Rover | GTO |
| 45 | Mitchell / Ratcliff / Cooper | Autosport Technology (USA) | | Porsche | 914 | /6 | Porsche | GTU |
| 46 | Leuzinger / Van der Werff | B R Racing | | De Tomaso | Pantera | | Ford | GTO |
| 48 | McDill / Whitaker | Meldeau Tire Stores | | Chevrolet | Camaro | | Chevrolet | GTX |
| 49 | Cosentino / Speakman | Faza Squadra | Alfred Cosentino | Mazda | RX-7 | | Mazda | GTU |
| 50 | Downing / Hoerr / Hoerr | Downing/Maffucci Racing (USA) | Jim Downing | Mazda | RX-7 | | Mazda | GTU |
| 52 | Swanson / Cripe / McDonald | Ours & Hours Racing | | Porsche | 911 | | Porsche | GTU |
| 53 | Hochreuter / Brezinka / Hirsch | Fritz Hochreuter (CDN) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 54 | Naon / Garcia / Cruz | Florida Crystals/Montura Racing (USA) | Tony Garcia | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 55 | Mandeville / Johnson | Mandeville Racing Ent. (USA) | Roger Mandeville | Mazda | RX-7 | | Mazda | GTU |
| 56 | Borlase / *Hammond / *Kravig | Rick Borlase | | Porsche | 911 Carrera | | Porsche | GTO |
| 57 | Baker / Overby / Gilliland | Personalized Autohaus (USA) | Wayne Baker | Porsche | 914 | /6 | Porsche | GTU |
| 58 | Kendall / Smith / Aase | Charles Kendall (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 60 | Lee / Smith / Marx | Bob's Speed Products | | AMC | AMX | | | GTO |
| 61 | Canada / *Moffitt / *Cochran | Sharkskin Racing | | Chevrolet | Corvette | | Chevrolet | GTO |
| 62 | Koll / Kline | Kegel Enterprises (USA) | | Porsche | 911 | SC | Porsche | GTU |
| 65 | English / Yenko / McClure | Yenko Chevrolet (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 66 | Dunham / Sheehy / Sereix | Dunham Trucking (USA) | Jack Dunham | Mazda | RX-7 | | Mazda | GTU |
| 67 | Ramirez / Gordillo / Villa | Pennzoil of Puerto Rico | | Porsche | 911 | | Porsche | GTU |
| 68 | Valentine / Carter | USA Racing (USA) | Richard J. Valentine | Chevrolet | Corvette | | Chevrolet | GTX |
| 70 | Doyle / *Phipps | Doyle Racing (USA) | Chris Doyle | Mazda | RX-7 | | Mazda | GTU |
| 71 | Morgan / Miller / Forrest | Morgan Performance Group (USA) | Charles Morgan | Datsun | 280ZX | | Datsun | GTU |
| 72 | Taylor / Ramsey | Vince Thompson (USA) | | Chevron | GTP | | Alfa Romeo | GTX |
| 73 | Speer / Joosen / Vermeersch | Z & W Enterprises (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 74 | Honegger / Soto | Z & W Enterprises (USA) | | Mazda | RX-7 GTP | | Mazda | GTX |
| 75 | Honegger / Dieudonné / Libert / *Joosen / *Speer / *Archilla / *Vermeersch | Z & W Enterprises (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 77 | Jennings / Bean / Ashby | Bruce R. Jennings (USA) | Bruce Jennings | Porsche | 911 | S | Porsche | GTU |
| 79 | Van Every / *Bond / *Tisdelle | Van Every Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 81 | Dietrich / Winters / McDonough | Trinity Racing | | Mazda | RX-7 | | Mazda | GTU |
| 82 | Cook / Casey / Bergstrom | Trinity Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 83 | Shafer / Shafer / Crookston | George R. Shafer (USA) | Craig Shafer | Chevrolet | Camaro | II | Chevrolet | GTX |
| 84 | "Jamsal" / Barrientos / Valiente | Scorpio Racing (ES) | | Porsche | 935 | M16 | Porsche | GTX |
| 85 | Loving / *Noseda / *Small | Sunrise Auto Parts | | Chevrolet | Camaro | | Chevrolet | GTO |
| 86 | Haywood / Holbert / Leven | Bayside Disposal Racing (USA) | Bruce Leven | Porsche | 935 | /80 | Porsche | GTX |
| 88 | Bitterauf / Moxley / Leo | Klaus Bitterauf | | Porsche | 911 | | Porsche | GTU |
| 89 | Levenson / *Kleinschmidt / *Kleinschmidt | Vette Brakes (USA) | | Chevrolet | Corvette | C2 | Chevrolet | GTO |
| 90 | Woods / Kent-Cooke / McKitterick | Cooke Woods Racing/Garretson Enterprises (USA) | Roy Woods | Porsche | 935 | K3 | Porsche | GTX |
| 91 | Henn / Gunn / Belcher | T-Bird Swap Shop (USA) | | Ferrari | 512 BB | | Ferrari | GTX |
| 92 | Rude / Galica / *Mueller | Kent Racing (USA) | David Kent | Mazda | RX-7 | | Mazda | GTU |
| 93 | Carusso / Boy / Ramsey | Sanyo/Russ Boy | | Chevrolet | Corvette | | Chevrolet | GTO |
| 94 | Whittington / Whittington / Whittington | Whittington Bros (USA) | | Porsche | 935 | K3 | Porsche | GTX |
| 97 | Cummings / Juckette | The Cummings Marque | | Chevrolet | Monza | | Chevrolet | GTX |
| 98 | Mueller / Bohren | Kent Racing (USA) | David Kent | Mazda | RX-7 | | Mazda | GTU |