| 0 | Ongais / Field / Minter | Interscope Racing (USA) | Ted Field | Porsche | 935 | /77A | Porsche | GTX | Div.2/Gr.5 |
| 01 | White / Mesnick / Roehrig | Roehrig Racing (USA) | J. Dana Roehrig | Porsche | 911 | S | Porsche | GTU | |
| 02 | Neland / Levenson / Brown | Al Levenson (USA) | Al Levenson | Chevrolet | Corvette | C2 | Chevrolet | GTO | |
| 03 | Rice / Levetto | Guido Levetto (USA) | Guido Levetto | Chevrolet | Camaro | Z28 | Chevrolet | GTO | |
| 05 | Bond / Kreider / Dann | Dale Kreider Racing (USA) | Dale Kreider | Chevrolet | Monza | | Chevrolet | GTX | |
| 07 | Cowart / Mendez / Castellano | Morrison's Porsche (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 08 | Wolters / Refenning / Mummery | Terry Wolters (USA) | Terry Wolters | Porsche | 911 | S | Porsche | GTU | |
| 09 | Belcher / Bundy / Holbert | Belcher Racing (USA) | Gary Belcher | Porsche | 934 | /5 | Porsche | GTX | |
| 2 | Hobbs / Peterson | McLaren North America (USA) | | BMW | 320 | i Turbo | BMW | GTX | Div.2/Gr.5 |
| 3 | Finotto / Facetti | Jolly Club (I) | Martino Finotto | Porsche | 935 | | Porsche | GTX | Div.2/Gr.5 |
| 4 | Mallet / Bondurant / Romolotti / *Camathias | Jolly Club (I) | Carlo Facetti | Ferrari | 308 GTB | | Ferrari | GTO | |
| 5 | Migault / Guitteny / Young | Grand Competition Cars Inc. (USA) | Howard O'Flynn | Ferrari | 365 GT4/BB | | Ferrari | GTX | Div.2/Gr.5 |
| 6 | Barbour / Schurti / Rutherford | Dick Barbour Performance (USA) | Dick Barbour | Porsche | 935 | /77A | Porsche | GTX | Div.2/Gr.5 |
| 7 | Heimrath / Bienvenue / Ridgely | Heimrath Racing (CDN) | Ludwig Heimrath | Porsche | 935 | | Porsche | GTX | |
| 8 | Besenzoni / Dal Ben / Wever | Jolly Club (I) | | Ferrari | 308 GTB | | Ferrari | GTO | Div.2/Gr.5 |
| 9 | Goellnicht / Marina / May / Arutunoff | Automobiles International (USA) | Anatoly Arutunoff | Lancia | Stratos | HF | Ferrari | GTU | |
| 10 | Church / Kump / Lee | Bob's Speed Products (USA) | | AMC | AMX | | | GTO | |
| 12 | Wollek / Pescarolo / Jaunet | Porsche Kremer Racing (D) | Erwin Kremer | Porsche | 935 | /77A | Porsche | GTX | Div.2/Gr.5 |
| 13 | Shaw, Jr. / Busby / Meister | Bankrupt Inc Racing (USA) | Hal Shaw | Porsche | 935 | | Porsche | GTX | Div.2/Gr.5 |
| 14 | Brambring / Schornstein / "Winter" | Kremer Porsche Racing (D) | Kremer Brothers | Porsche | 935 | K2 | Porsche | GTX | Div.2/Gr.5 |
| 15 | Beilcke / Grinbold / Gebhardt | Bavarian Motors Inc. (USA) | | BMW | 3.0 CSL | | BMW | GTX | |
| 17 | Fillingham / Chitwood / Jones | Tim Chitwood (USA) | Tim Chitwood | Chevrolet | Nova | | Chevrolet | GTO | |
| 18 | Gauthier / Swanson / West | Ours & Hours Racing (USA) | | Chevrolet | Camaro | | Chevrolet | GTX | |
| 19 | Cord / Adams | Chris Cord Racing (USA) | | Chevrolet | Monza | | Chevrolet | GTX | |
| 20 | Bostyan / Thompson / Yenko | Richard Bostyan (USA) | Richard Bostyan | Chevrolet | Corvette | C3 | Chevrolet | GTO | |
| 21 | Konrad / Jöst / Merl | Joest (D) | Franz Konrad | Porsche | 935 | | Porsche | GTX | Div.2/Gr.5 |
| 22 | Harriss / Bruckmann | Music City P&A (USA) | | Porsche | 911 | E | Porsche | GTU | |
| 24 | Frank / Bergstrom | Executive Industries (USA) | Tom Frank | Porsche | 911 Carrera | RSR | Porsche | GTX | |
| 25 | Miller / Miller / *Koveleski | KWM Racing (USA) | Kenper Miller | BMW | 3.5 CSL | | BMW | GTO | |
| 27 | Honegger / Scott / Hutchins / *Dean | Z&W Enterprises (USA) | | Mazda | RX-3 | | Mazda | GTU | |
| 29 | Weiss / Alsup / Follmer | Richard C. Weiss Racing Ent. (USA) | Richard Weiss | Porsche | 911 | S | Porsche | GTU | |
| 32 | Earle / Akin / Knoop | Earle/Akin Racing Associates Inc. (USA) | Steve Earle/Bob Akin | Porsche | 911 Carrera | RSR | Porsche | GTX | Div.2/Gr.5 |
| 33 | Fernandez / Paul / Currin | Boricua Racing (PR) | | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 34 | Drolsom / Davenport / Greb | Drolsom Racing Inc. (USA) | George Drolsom | Porsche | 911 | S | Porsche | GTU | |
| 36 | Case / Panaccione | Case Racing (USA) | | Porsche | 911 | | Porsche | GTU | Div.1/Gr.5 |
| 37 | Buchler / Johnson / Young | Clay Young (USA) | | Chevrolet | Camaro | | Chevrolet | GTX | |
| 38 | McDill / Meldeau | Meldeau Tire Co. (USA) | Mike Meldeau | Chevrolet | Camaro | | Chevrolet | GTX | |
| 39 | Pickett / Bonnet / Canepa | Pickett Racing (USA) | Greg Pickett | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 46 | DeNarvaez / Naon / Garcia | Mauricio DeNarvaez (CO) | Mauricio DeNarvaez | Porsche | 911 Carrera | RSR | Porsche | GTO | |
| 48 | Carusso / Donaldson / Sereix | Autodyne (USA) | John Carusso | Chevrolet | Corvette | C3 | Chevrolet | GTO | |
| 50 | Kleinschmidt / Culpepper | Native Tan (USA) | Charles Kleinschmidt | MG | B | GT | BMC | GTU | |
| 51 | Hotchkis / Kirby / Aase | Wynn's International (USA) | | Porsche | 911 | S | Porsche | GTU | |
| 52 | Katayama / Terada / Mandeville | Mazda Auto Tokyo Co. Ltd. (J) | | Mazda | RX-3 | | Mazda | GTU | Div.1/Gr.5 |
| 53 | Downing / Fisher / Bohren / Mandeville | Mazda Auto Tokyo Co. Ltd. (J) | | Mazda | RX-3 | | Mazda | GTU | Div.1/Gr.5 |
| 54 | Tunstall / Behr / Timolat | T&C/Big Apple Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTX | |
| 55 | Rodriguez / Cruz | Emiliano Rodriguez (USA) | Emiliano Rodriguez | Lotus | Europa | | Ford | GTU | |
| 56 | Valentine / Carter / Edwards | Carter Bros. Racing (CDN) | Craig Carter/Darrell Carter | Chevrolet | Camaro | II | Chevrolet | GTX | |
| 58 | Febles / Poole | Diego Febles Racing (PR) | Diego Febles | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | |
| 59 | Gregg / Ballot-Léna / Frisselle | JMS Brumos Porsche (USA) | Peter Gregg | Porsche | 935 | | Porsche | GTX | Div.2/Gr.5 |
| 60 | Thomas / Tilton / Bond | R&R Racing (USA) | | Porsche | 911 | S | Porsche | GTU | |
| 61 | Akaike / Cosentino | Faza Squadra (USA) | Alfred Cosentino | Mazda | RX-3 | | Mazda | GTU | |
| 65 | Morton / Adamowicz / Sahlman / Carradine | Carradine/Dan Ward Racing (USA) | David Carradine | Ferrari | 365 GTB/4 | | Ferrari | GTO | Div.2/Gr.5 |
| 66 | Devendorf / Adamowicz / Kline | Carradine/Dan Ward Racing (USA) | David Carradine | Ferrari | 365 GTB/4 | | Ferrari | GTX | |
| 68 | Mendez / Gonzalez / Ferrer | Luis Mendez (DR) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | |
| 71 | Romero / Soto / Beloff | Bill Scott Racing (USA) | Bill Scott | Porsche | 911 | S | Porsche | GTU | |
| 72 | Thompson / Hagan / Schmidt | Bill Arnold Racing (USA) | Bill Arnold | Chevrolet | Corvette | | Chevrolet | GTX | |
| 73 | Howey / Koch / Crabtree | Howey Farms (USA) | Clark Howey | Chevrolet | Camaro | II | Chevrolet | GTX | |
| 76 | Thomas / Mueller / Blackburn | Quality Inn of Boise, ID (USA) | Frank Thomas | Porsche | 911 | | Porsche | GTU | |
| 77 | Johnson / Shaw / Woodward | Levi's Team Highball (USA) | Amos Johnson/Dennis Shaw | AMC | Hornet | AMX | AMC | GTO | |
| 78 | Hillin / Henderson / Turner | Western Motor Works (USA) | | Ferrari | 365 GTB/4 | | Ferrari | GTO | |
| 80 | Adams / Bedard / Thomson | Herb Adams (USA) | Herb Adams | Oldsmobile | Cutlass | | | GTO | |
| 82 | Solomone / Lang / Fyhrie | Carm Solomone (USA) | Carm Solomone | Chevrolet | Camaro | | Chevrolet | GTX | |
| 84 | Doyle / Maffucci / Speakman | World Parts (USA) | Bob Speakman | Datsun | 260Z | | Datsun | GTU | |
| 85 | Hulen / Coupland / Engels | John E. Hulen (USA) | John Hulen | Porsche | 914 | /6 | Porsche | GTU | |
| 86 | Guthrie / Kleinpeter / Stevens | Team Pantera FL (USA) | Hugh Kleinpeter | De Tomaso | Pantera | GT4K | Ford | GTX | |
| 87 | Vazquez / Oyler / Hamilton / Hamilton / Seipolt | Pedro Vazquez (USA) | Pedro Vazquez, Jr. | Porsche | 911 | S | Porsche | GTU | |
| 88 | Hamilton / Wade / Hinze | Hamilton House Racing (USA) | | Porsche | 911 | S | Porsche | GTU | |
| 91 | Bondurant / Cook / Southern | Bondurant School (USA) | Bob Bondurant | Datsun | 260Z | | Datsun | GTU | |
| 94 | Henn / Sahlman / Satullo | Swap Shops (USA) | Preston Henn | Ferrari | 365 GTB/4 | | Ferrari | GTO | |
| 95 | Haywood / Hagestad / Bundy | Bob Hagestad (USA) | Bob Hagestad | Porsche | 935 | | Porsche | GTX | |
| 99 | Stommelen / Hezemans / Gregg | JMS Brumos Porsche (USA) | Georg Loos | Porsche | 935 | /77A | Porsche | GTX | Div.2/Gr.5 |