| 0 | Field / Minter / Ongais | Interscope Racing (USA) | Ted Field | Porsche | 935 | K3/80 | Porsche | GTX | |
| 00 | Field / Ongais / Minter | Interscope Racing (USA) | Ted Field | Porsche | 935 | K3/80 | Porsche | GTX | |
| 01 | Brunn / Kirby / Hotchkis | Kirby-Hitchcock Racing | John Hotchkis | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 02 | Morton / Klausler | Firestone Tire & Rubber (USA) | | Ford | Mustang | | Ford | GTX | |
| 03 | Pallavicini / Sheldon / Crang | Angelo Pallavicini (CH) | | Porsche | 934 | | Porsche | GTO | |
| 04 | Almeida / Rodriguez / Morejon | T & R Racing (USA) | Tico Almeida/Rene Rodriguez | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 05 | Almeida / Rodriguez / Flaquer | T & R Racing (USA) | Tico Almeida/Rene Rodriguez | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 06 | Halsmer / *Crevier / *Unser, Jr. | Crevier Imports (USA) | Joe Crevier | Ferrari | 365 GTB/4 | | Ferrari | GTO | |
| 07 | Heimrath / Heimrath, Jr. | Heimrath Racing (CDN) | Ludwig Heimrath | Porsche | 935 | | Porsche | GTX | |
| 09 | Henn / Bondurant / *Whittington | Thunderbird Swap Shop (USA) | Preston Henn | Porsche | 935 | K3 | Porsche | GTX | |
| 1 | Fitzpatrick / Busby / Wollek | John Fitzpatrick Racing (D) | John Fitzpatrick | Porsche | 935 | K3/80 | Porsche | GTX | |
| 2 | Hobbs / Surer / Quester | BMW Motorsport (USA) | | BMW | M1 | | BMW | GTX | +2000/Gr.5 |
| 3 | Patrese / Heyer / Pescarolo | Martini Lancia Racing (I) | | Lancia | Beta Montecarlo Turbo | | Lancia | GTX | -2000/Gr.5 |
| 4 | Alboreto / Ghinzani / Gabbiani | Martini Lancia Racing (I) | | Lancia | Beta Montecarlo Turbo | | Lancia | GTX | -2000/Gr.5 |
| 5 | Akin / Siebert / Bell | Bob Akin Motor Racing (USA) | Bob Akin | Porsche | 935 | K3 | Porsche | GTX | |
| 6 | Merl / Mass / *Jöst | Joest Racing (D) | Reinhold Jöst | Porsche | 935 | J | Porsche | GTX | +2000/Gr.5 |
| 7 | Bohren / Mullen / Roehrig | Kent Racing (USA) | Jim Mullen | Mazda | RX-7 | | Mazda | GTU | |
| 9 | Garretson / Rahal / Redman | Garretson Racing/Style Auto (USA) | Bob Garretson | Porsche | 935 | K3/80 | Porsche | GTX | |
| 10 | Facetti / *Finotto | Jolly Club (I) | | Ferrari | 308 GTB Turbo | | Ferrari | GTX | +2000/Gr.5 |
| 11 | Holbert / Mears / Bundy | Holbert Racing (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTO | |
| 13 | Kemp / Pasmas / Baird | Kemp Motoracing (USA) | Charlie Kemp | Ford | Mustang | II Cobra | Ford | GTX | |
| 14 | Stuck / Gebhardt / Brun | Bavarian Motors International | | BMW | M1 | | BMW | GTO | |
| 15 | Lutz / Boone / *White | D. L. Performance Engineering (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | |
| 16 | Burt / Grunnet / Paquette | Corp Racing Ltd. | | Mazda | RX-7 | | Mazda | GTU | |
| 17 | Beilcke / König / Walch | Bavarian Motors International | | BMW | 3.5 CSL | | BMW | GTO | |
| 18 | Paul / Paul, Jr. / *Smiley | JLP Racing (USA) | John Paul | Porsche | 935 | JLP-2 | Porsche | GTX | |
| 19 | Van Every / Tisdelle / Bond | Van Every Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 20 | Cord / Adams | Chris Cord Racing (USA) | | Chevrolet | Monza | | Chevrolet | GTX | |
| 21 | Shaw / Cashen | Race Masters | | Lotus | Esprit | S1 | Lotus | GTU | |
| 22 | Baker / Gilliland / Harmstad | Personalized Autohaus (USA) | Wayne Baker | Porsche | 914 | /4 | VW | GTU | |
| 23 | Davenport / Carney / Johnson | The New Raytown Datsun (USA) | Frank Carney | Datsun | 280ZX | | Datsun | GTU | |
| 24 | Pirro / Finotto / Facetti | Jolly Club (I) | | Lancia | Beta Montecarlo Turbo | | Lancia | GTX | -2000/Gr.5 |
| 25 | Miller / Cowart / Londono | Red Lobster Racing (USA) | | BMW | M1 | | BMW | GTO | |
| 27 | Southard / Kjoller / Kjoller | Southard Motor Racing | | Porsche | 911 Carrera | | Porsche | GTO | |
| 28 | Posey / Stiff | NTS Racing | | Datsun | 280ZX | Turbo | Datsun | GTO | |
| 30 | Moretti / Mendez / DeNarvaez | Momo/Penthouse (I) | Giampiero Moretti | Porsche | 935 | J | Porsche | GTX | |
| 33 | Zitza / Zitza / Dube | Zotz Garage (USA) | | Porsche | 914 | /6 | Porsche | GTU | |
| 34 | Drolsom / Hoskins / Johnson | Drolsom Racing (USA) | George Drolsom | Porsche | 911 Carrera | S | Porsche | GTO | |
| 36 | Miller / Bedard / McKitterick | Herman & Miller P+A | | Porsche | 924 | Carrera GTR | Porsche | GTO | |
| 37 | Romero / Gonzalez / Mendez | Pepe Romero (USA) | Pepe Romero | Porsche | 935 | M16 | Porsche | GTX | |
| 38 | Case / Panaccione / Tilton | Case Racing | | Porsche | 911 | | Porsche | GTU | |
| 40 | Bartling / Freberg / Deacon | David Deacon Racing (CDN) | | BMW | M1 | | BMW | GTO | |
| 42 | Northam / Kuhel / Neland | Mac's Bar Spec./Kend Co. | | Chevrolet | Camaro | | Chevrolet | GTO | |
| 43 | Young / Jones / Gregg | Bob Gregg Racing (USA) | Bob Gregg | Porsche | 911 Carrera | | Porsche | GTO | |
| 44 | Labonte / Pearson / *Hagan | Stratagraph (USA) | Billy Hagan | Chevrolet | Camaro | II | Chevrolet | GTX | |
| 45 | Speer / Mitchell / Ratcliff | Autosport Technology (USA) | | Porsche | 914 | /6 | Porsche | GTU | |
| 46 | Espinosa / DeNarvaez / Cortes | DeNarvaez Ent. (CO) | Mauricio DeNarvaez | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 49 | Speakman / *Cosentino | Faza Squadra | Alfred Cosentino | Mazda | RX-7 | | Mazda | GTU | |
| 50 | Hoerr / Hoerr / Downing | Downing/Maffucci Racing (USA) | Jim Downing | Mazda | RX-7 | | Mazda | GTU | |
| 51 | Stommelen / Grohs / Meister | Andial Racing/Meister Homes (USA) | Howard Meister | Porsche | 935 | M16 | Porsche | GTX | |
| 52 | Cripe / Gauthier / Swanson | Beach Ball Racing | | Porsche | 911 | | Porsche | GTU | |
| 54 | Garcia / Naon / Sereix | Montura Racing (USA) | Tony Garcia | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 55 | Mandeville / Johnson / Febles | Mandeville Racing Team (USA) | Roger Mandeville | Mazda | RX-7 | | Mazda | GTU | |
| 57 | Scott / Goodell / Bruckmann | Personalized Autohaus (USA) | Wayne Baker | Porsche | 914 | /6 | Porsche | GTU | |
| 58 | Smith / Kendall / Earle | Charles Kendall (USA) | Charles Kendall | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 60 | Smith / Miller / Lee | Bob's Speed Products (USA) | | AMC | AMX | | | GTO | |
| 62 | Koll / Kline / McFarlin | Kegel Enterprises (USA) | | Porsche | 911 | SC | Porsche | GTU | |
| 65 | Adamowicz / Knoop | Prancing Horse Farms Racing | Ron Spangler | Ferrari | 512 BB | /LM | Ferrari | GTX | |
| 66 | Dunham / Maffucci / *Barrett | Downing/Maffucci Racing (USA) | Jack Dunham | Mazda | RX-7 | | Mazda | GTU | |
| 67 | Shaw / Whitman / Blackburn | Levi's Team Highball | | AMC | Spirit | AMX | AMC | GTO | |
| 69 | Long / Showket / McGraw | Southwind Ent. | | Plymouth | Volare | | Plymouth | GTO | |
| 70 | Doyle / Phipps / Overby | Chris Doyle (USA) | Chris Doyle | Mazda | RX-7 | | Mazda | GTU | |
| 71 | Keirn / Engle / Boand | Keirn Garage (USA) | Philip Keirn | Chevrolet | Corvette | C3 | Chevrolet | GTO | |
| 73 | Libert / Regout / Xhenceval | Z&W Enterprises (USA) | | Mazda | RX-7 GTP | | Mazda | GTX | |
| 74 | Honegger / Dieudonné / Soto | Z&W Enterprises (USA) | | Mazda | RX-7 GTP | | Mazda | GTX | |
| 75 | Vermeersch / Joosen / Libert | Z&W Enterprises (USA) | | Mazda | RX-7 | | Mazda | GTO | |
| 78 | Howey / Wolf / Koch | Wolf Engines (USA) | Tracy Wolf | Chevrolet | Camaro | II | Chevrolet | GTO | |
| 80 | Carter / Wietzes / Valentine | Maurice Carter Racing (CDN) | | Chevrolet | Camaro | II | Chevrolet | GTX | |
| 81 | Winters / Dietrich / Alsop | Trinity Racing | | Mazda | RX-7 | | Mazda | GTU | |
| 82 | Bergstrom / Casey / Cook | Trinity Racing (USA) | | Mazda | RX-7 | | Mazda | GTU | |
| 84 | "Jamsal" / Barrientos / Gonzalez | Scorpio Racing Team (ES) | | Porsche | 935 | M16 | Porsche | GTX | |
| 86 | Haywood / Barth / Leven | Bayside Disposal/Brumos Racing (USA) | Bruce Leven | Porsche | 935 | /80 | Porsche | GTX | |
| 87 | Stone / *Beasley / *Frank | Bob Beasley (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 88 | Adams / Thompson / Sherman | Herb Adams VSE | | Chevrolet | Camaro | | Chevrolet | GTO | |
| 89 | Bitterauf / Moxley / Leo | Klaus Bitterauf | | Porsche | 911 | S | Porsche | GTU | |
| 94 | Whittington / Whittington / Whittington | Whittington Brothers (USA) | | Porsche | 935 | K3 | Porsche | GTX | |
| 97 | Cummings / McDill / Levetto | The Cummings Marque | | Shelby | GT350 | | Ford | GTO | |
| 98 | Mueller / Rude / Martin | Kent Racing (USA) | David Kent | Mazda | RX-7 | | Mazda | GTU | |
| 99 | Heinz / Gleason / Cogbill / *Gassaway | Gassaway/Oftedahl Racing (USA) | Gordon Oftedahl | Chevrolet | Camaro | II | Chevrolet | GTO | |