| 0 | Rutherford / Wallace / Wallace | Chesrown Olds | | Oldsmobile | Cutlass | | Oldsmobile | AC |
| 00 | Southard / Trueman | Red Roof Inns (USA) | | Porsche | 914 | /6 | Porsche | GTU |
| 01 | White / Roehrig / Mesnick | Roehrig Racing Inc. (USA) | J. Dana Roehrig | Porsche | 911 | S | Porsche | GTU |
| 02 | Redszus / Rosen | H. David Redszus | | BMW | 2002 | | BMW | GTU |
| 03 | Gottlob / Terrill | Cliff Gottlob (USA) | Cliff Gottlob | Chevrolet | Corvette | | Chevrolet | GTO |
| 04 | Thompkins / Blessing | Rick Thompkins | | Chevrolet | Corvette | | Chevrolet | GTO |
| 05 | Bond / Dann | Saltwater Band (USA) | | Chevrolet | Monza | | Chevrolet | GTX |
| 06 | Shulnburg / Heinz / Keyser / *McClain | R. V. Shulnburg Scrap Metal (USA) | | Chevrolet | Corvette | | Chevrolet | GTX |
| 07 | Cowart / Craw / Castellano | Morrison's Inc. | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 08 | Wolters / Miller | Terry Wolters (USA) | Terry Wolters | Porsche | 911 | S | Porsche | GTU |
| 09 | Belcher / Bundy / *Holbert | Belcher Racing (USA) | | Porsche | 934 | /5 | Porsche | GTX |
| 1 | Kreider / *Baldwin | Dale Kreider Racing (USA) | Dale Kreider | Chevrolet | Corvette | | Chevrolet | GTX |
| 2 | Hobbs / Minter / Klausler | McLaren North America (USA) | | BMW | 320 | i Turbo | BMW | GTX |
| 3 | Freeman / Harmon / Leydecker | Bill Freeman Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTX |
| 4 | Leuzinger / Van der Werff | B. R. Racing Team | | De Tomaso | Pantera | | Ford | GTO |
| 6 | Barbour / Stommelen / Schurti | Dick Barbour Performance (USA) | Dick Barbour | Porsche | 935 | /77A | Porsche | GTX |
| 7 | Heimrath / *Ridgely | Heimrath Racing (CDN) | Ludwig Heimrath | Porsche | 935 | | Porsche | GTX |
| 8 | Beasley / Jennings | Robert Beasley (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTX |
| 9 | Redman / Mendez / Garretson | Dick Barbour Performance (USA) | Dick Barbour | Porsche | 935 | | Porsche | GTX |
| 11 | Javier Garcia | Javier Garcia | | Chevrolet | Corvette | C3 | Chevrolet | GTX |
| 12 | Garcia / Vilarchao | George Garcia (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 13 | Shaw, Jr. / Spalding | Ore House - Vail (USA) | Hal Shaw | Porsche | 935 | | Porsche | GTX |
| 14 | LaMay / Valentine / Parker | Robert LaMay | | Ford | Mustang | | Ford | GTO |
| 16 | Slodowick / McCandless / Miller | Striped Tiger Racing | | Porsche | 914 | /6 | Porsche | GTU |
| 17 | LaGrow / Tumbleston | Kenneth LaGrow | | Chevrolet | Camaro | | Chevrolet | GTX |
| 19 | Arutunoff / *Goellnicht / *Marina | Hallet Motor Racing Circuit (USA) | Anatoly Arutunoff | Lancia | Stratos | HF | Ferrari | GTU |
| 20 | Bostyan / Thompson / Yenko | Bostyan Racing | Richard Bostyan | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 21 | DiLella / Cueto | DiLella Racing (USA) | | Porsche | 914 | /4 | VW | GTU |
| 23 | Overbagh / *Hagan / *Wamsley | Overbagh Motor Racing (USA) | Hoyt Overbagh | Chevrolet | Monza | | Chevrolet | GTO |
| 24 | Frank / Bergstrom | Executive Industries (USA) | Tom Frank | Porsche | 911 Carrera | RSR | Porsche | GTX |
| 25 | Miller / Bohren | KWM Racing (USA) | Kenper Miller | BMW | 3.5 CSL | | BMW | GTO |
| 27 | Mummery / Refenning / Sheehy | Miami Auto Racing | Ray Mummery | Porsche | 911 | S | Porsche | GTU |
| 28 | Kearns / Hinze / Behr | Desperado Racing (USA) | Clif Kearns | Porsche | 935 | | Porsche | GTX |
| 30 | Gonzalez / Cruz / Villa | Aro-Mandy Racing | | BMW | 3.0 CSL | | BMW | GTO |
| 32 | Earle / Akin / Knoop | Earle & Akin Racing (USA) | Steve Earle/Bob Akin | Porsche | 911 Carrera | RSR | Porsche | GTX |
| 33 | Paul / Fernandez | JLP Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 34 | Drolsom / Davenport | Drolsom Racing Inc. (USA) | George Drolsom | Porsche | 911 | S | Porsche | GTU |
| 35 | Beilcke / Grinbold / Gebhardt | Team Beilcke (USA) | | BMW | 2002 | | BMW | GTU |
| 36 | Case / Panaccione / Rynerson | Case Racing | | Porsche | 911 | | Porsche | GTU |
| 38 | Meldeau / McDill | Meldeau Tire Co. | | Chevrolet | Camaro | | Chevrolet | GTX |
| 40 | Quintana / *Stone | Quintana Racing (USA) | | Ford | Mustang | | Ford | GTX |
| 41 | Jones, Jr. / Faul | Jones Ind. Racing (USA) | Herb Jones, Jr. | Chevrolet | Camaro | II | Chevrolet | GTX |
| 42 | Soldevilla / Gordillo | El Sol Racing | | Porsche | 911 | S | Porsche | GTU |
| 45 | Steele / Gaeta / Zulkowski | Vann's Auto Body | | Porsche | 911 | | Porsche | GTU |
| 46 | DeNarvaez / Naon | Mauricio De Narvaez (CO) | Mauricio DeNarvaez | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 47 | Chitwood / Fillingham / Jones | Tim Chitwood (USA) | Tim Chitwood | Chevrolet | Nova | | Chevrolet | AC |
| 48 | Sereix / St. James / Currin | Autodyne (USA) | John Carusso | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 49 | Schumacher / *Hubbard / *Kelly | Ted Schumacher Racing (USA) | | Triumph | GT6 | | Triumph | GTU |
| 50 | Hochreuter / Bartling / Brezinka | Fritz Hochreuter (CDN) | | Porsche | 911 | S | Porsche | GTU |
| 51 | Hotchkis / Kirby / Aase | Wynn's International | | Porsche | 911 | S | Porsche | GTU |
| 52 | Kleinschmidt / Culpepper / Koch | Native Tan (USA) | | MG | B | GT | BMC | GTU |
| 54 | Lopez / *Garcia | Raul Garcia (USA) | Raul Garcia | Chevrolet | Camaro | II | Chevrolet | GTX |
| 57 | Keller / Gray / Northam | Sebring Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 58 | Febles / Poole | Diego Febles Racing (PR) | Diego Febles | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 59 | Gregg / *Frisselle | Brumos Porsche (USA) | Peter Gregg | Porsche | 935 | | Porsche | GTX |
| 61 | Cosentino / Downing | Faza Squadra (USA) | Alfred Cosentino | Mazda | RX-3 | | Mazda | GTU |
| 62 | Koll / Hamren / Sherman | William J. Koll (USA) | | Porsche | 914 | /6 | Porsche | GTU |
| 65 | Valhuerdi / Jernigan | Ahmed Valhuerdi (USA) | | Shelby | GT350 | | Ford | GTX |
| 70 | Speer / Turley | Race Car Ent. (USA) | | Porsche | 911 | S | Porsche | GTU |
| 71 | Higgins / Cooper / King | Foreign Exchange Racing (USA) | | Porsche | 911 | | Porsche | GTU |
| 73 | Howey / Koch | Howey Farms (USA) | | Chevrolet | Camaro | II | Chevrolet | GTX |
| 76 | Thomas / Mueller / May | Quality Inn (USA) | Frank Thomas | Porsche | 911 | | Porsche | GTU |
| 77 | Romero / Soto | Bill Scott Racing | Bill Scott | Porsche | 911 | S | Porsche | GTU |
| 78 | Bremner / *McKnight | Abingdon/Ashley Motors (CDN) | | Triumph | TR7 | | Triumph | GTU |
| 79 | Callas / Papke / Cook | Rennsport Porsche Works (USA) | Michael Callas | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 80 | Adams / Bedard / Thomson | Herb Adams (USA) | Herb Adams | Oldsmobile | Cutlass | | Oldsmobile | AC |
| 81 | Montalvo / Garcia | Juan Montalvo | | Ford | Escort | I | Ford | GTU |
| 84 | Speakman / Maffucci | Worldparts (USA) | Bob Speakman | Datsun | 260Z | | Datsun | GTU |
| 85 | Hulen / Coupland / Engels | John Hulen (USA) | John Hulen | Porsche | 914 | /6 | Porsche | GTU |
| 86 | Kleinpeter / Stevens | Team Pantera (USA) | Hugh Kleinpeter | De Tomaso | Pantera | GT4K | Ford | GTX |
| 87 | Vazquez / Oyler | Pedro Vazquez (USA) | | Porsche | 911 | S | Porsche | GTO |
| 88 | Hamilton / Wade / Collins | Hamilton House Racing | | Porsche | 911 | S | Porsche | GTU |
| 89 | Bond / Tilton | Barrick Motor Racing | | Porsche | 911 | | Porsche | GTU |
| 91 | Frank / Schramm | Framm Promotions/W. Frank (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 92 | Sloyer / Fitzgerald | Road Atlanta | | Plymouth | Volare | | Plymouth | AC |
| 93 | Whittington / Boy | Whittington Bros. (USA) | | Porsche | 934 | /5 | Porsche | GTX |
| 95 | Hagestad / Haywood | Bob Hagestad (USA) | Bob Hagestad | Porsche | 935 | | Porsche | GTX |
| 96 | Felton / Gimondo | Unicure | | Buick | Skylark | | Buick | AC |
| 99 | Cook / Cooper / Southern | Bob Bondurant (USA) | | Datsun | 260Z | | Datsun | GTU |