| 01 | Frates / *Ross / *Buzbee | William Frates | | Datsun | 240Z | | Datsun | GTU |
| 02 | Scott / Minter | Bill Scott | | VW | Scirocco | | VW | GTU |
| 03 | Gebhardt / Grinbold / Beilcke | Bavarian Motors (USA) | | BMW | 2002 | | BMW | GTU |
| 04 | Kreider / Bond | Bill Nelson (USA) | | Pontiac | Astre | | Pontiac | GTO |
| 05 | Trueman / Rahal | Red Roof Inns/Jim Trueman (USA) | | Chevrolet | Monza | | Chevrolet | GTO |
| 06 | Chitwood / Gimondo | Chitwood Racing (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 07 | Mendez / Cowart / *Panaccione | Charles Mendez Jr. | | Porsche | 911 | T | Porsche | GTU |
| 08 | Oyler / Braun / Church | Stiles Construction | | Renault | 12 | | Renault | GTU |
| 2 | Theodoracopulos / Jourdain | Harry Theodoracopulos (USA) | | Chevrolet | Monza | | Chevrolet | GTO |
| 3 | Hartman / Domiteaux / Flores / Turner | Bart Hartman (USA) | | Austin | Marina | | | GTU |
| 4 | Bergstrom / Shaw / Palmer | C.A.C.I. | | Honda | Civic | | Honda | GTU |
| 5 | Gage / Emig / Velasquez, Jr. | Richard Weiss (USA) | | Porsche | 911 | S | Porsche | GTU |
| 7 | Gray / Keller | Team Sebring Racing (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 8 | Arutunoff / Marina / May | Automobiles International (USA) | | Lotus | Europa | | | GTU |
| 9 | Ansley / *Connelly | Tony Ansley (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 11 | Gunn / Baird | Dallas Heyser/SL-1 (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 12 | Smith / Aiken | Paul Bowden Racing (USA) | Ford Smith | Chevrolet | Camaro | C3 | Chevrolet | GTO |
| 14 | Holbert / Keyser | G. W. Dickinson/Holbert Porsche-Audi (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 15 | Garcia / Garcia | Garcia Brothers Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 17 | Bowles / *Rose | Aubrey Bowles | | Porsche | 911 | S | Porsche | GTU |
| 18 | Wolters / Miller / Castellano | Terry Wolters | | Chevrolet | Camaro | | Chevrolet | GTO |
| 19 | Thompson / Bostyan / Yenko | Richard Bostyan | Richard Bostyan | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 21 | Stone / Gillingham / Fine | Richard Stone (USA) | | Shelby | GT350 | | Ford | GTO |
| 22 | Lilly / Marrs | Tony Lilly (USA) | | Lotus | Europa | | | GTU |
| 24 | Hobbs / Parsons | BMW Motorsport North America | | BMW | 3.0 CSL | | BMW | GTO |
| 26 | Gonzalez / Fernandez / Ramirez | Bonky Fernandez | | Lotus | Elan | | | GTU |
| 27 | Mummery / Refenning / Van Arsdale | Jack Refenning (USA) | | Porsche | 911 | S | Porsche | GTU |
| 29 | Wamsley / Thomas | Hoyt Overbagh | Hoyt Overbagh | Chevrolet | Corvette | | Chevrolet | GTO |
| 30 | Quintanilla / Gonzalez | John McClelland | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 31 | Montalvo / Grob | Juan Montalvo | | Ford | Escort | I | Ford | GTU |
| 33 | Stefl / *Carusso | John Carusso (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 34 | Drolsom / Nagel | George Drolsom (USA) | George Drolsom | Porsche | 911 | S | Porsche | GTU |
| 36 | Almeida / Romero | Motorcito Racing | | Chevrolet | Camaro | | Chevrolet | GTO |
| 37 | Jann / *Greenwood / *Mancuso | Rick Mancuso (USA) | Rick Mancuso | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 38 | Spruell / Johnston / Petersen | Paul Spruell | | Alfa Romeo | Alfetta GT | | Alfa Romeo | GTU |
| 39 | Doran / Belcher | Wiley Doran (USA) | Wiley Doran | Chevrolet | Corvette | | Chevrolet | GTO |
| 40 | Sherk / Shulnburg / *Donaldson | R. V. Shulnberg (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 41 | Jones, Jr. / Faul | Jones Industries Racing (USA) | Herb Jones, Jr. | Chevrolet | Camaro | II | Chevrolet | GTO |
| 42 | Hindson / Carney / Davenport | Bob Hindson Racing | | Porsche | 911 | S | Porsche | GTU |
| 43 | O'Steen / Helmick | Ecurie Escargot (USA) | Dave Helmick | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 44 | DeNarvaez / Naon / Freyre | Mauricio DeNarvaez (CO) | Mauricio DeNarvaez | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 45 | Moran / Fine / "Jamsal" | Carlos Moran | | Porsche | 911 | S | Porsche | GTU |
| 46 | Quintana / Mendez / Valhuerdi | Ahmed Valhuerdi (USA) | | Shelby | GT350 | | Ford | GTO |
| 47 | Johnson / Young / Felton | Clay Young (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 49 | Potter / Boyer | Neil Potter | | Ford | Mustang | | Ford | GTO |
| 50 | Hochreuter / Goebbels / Berner | Motex Auto (CDN) | | Porsche | 911 | S | Porsche | GTU |
| 51 | Kirby / Hotchkis / Jones | Max Dial Porsche-Audi (USA) | Bob Kirby/Hitchcock | Porsche | 914 | /6 | Porsche | GTU |
| 52 | Tunstall / Wade / *Jenkins | Starbrite | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 54 | Sahlman / Southard / Job | Spirit Racing | | Porsche | 914 | /6 | Porsche | GTU |
| 55 | Kleinschmidt / Andrus | Charles Kleinschmidt (USA) | | MG | B | GT | BMC | GTU |
| 56 | Hagestad / Jolly | Spirit of Colorado/Hagestad Porsche (USA) | Bob Hagestad | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 58 | Febles / Cruz | Diego Febles Racing (PR) | Diego Febles | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 59 | Gregg / Haywood | BMW Motorsport North America (USA) | Peter Gregg | BMW | 3.0 CSL | | BMW | GTO |
| 60 | Bond / Tilton | Rusty Bond | | Porsche | 911 | S | Porsche | GTU |
| 61 | Busby / Shafer | Brumos Porsche-Audi (USA) | Jim Busby | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 63 | Mendez / *Canahuate / *Rodriguez | Luis Mendez | | BMW | 2002 | | BMW | GTU |
| 64 | Craw / Morton / Peacock | Miller & Norburn | | BMW | 2002 | TI | BMW | GTU |
| 66 | Behr / Guthrie | Big Apple Racing/Champale (USA) | | Chevrolet | Monza | | Chevrolet | GTO |
| 67 | White / McClain | Havatampa Cigar (USA) | | Porsche | 911 Carrera | S | Porsche | GTU |
| 68 | Meldeau / McDill | Mike Meldeau | | Chevrolet | Camaro | | Chevrolet | GTO |
| 71 | Noseda / *Small | Ralph Noseda (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 72 | Arnold / Thompson | Bill Arnold (USA) | | Chevrolet | Corvette | C2 | Chevrolet | GTO |
| 73 | Crabtree / Howey | Howey Farms | | Chevrolet | Corvette | C2 | Chevrolet | GTO |
| 75 | Grenier / *Quigley / *Ragland | Skip Grenier (USA) | | Mazda | RX-2 | | Mazda | GTU |
| 76 | Greenwood / Brockman | Levitt Racing/Spirit of Sebring (USA) | Jim Levitt/John Greenwood | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 77 | Jennings / Beasley | Bruce Jennings (USA) | Bruce Jennings | Porsche | 911 | S | Porsche | GTU |
| 78 | Sereix / Gonzalez / Robayna | Ignacio Gonzalez | | Chevrolet | Camaro | | Chevrolet | GTO |
| 79 | Nooe / *Gahn | Don Nooe | | Shelby | GT350 | | Ford | GTO |
| 81 | Smith / Herman | Dave Smith (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 82 | Ross / Weber | Tom Ross | | Ford | Mustang | | Ford | GTO |
| 83 | Logan / Johnson | Jim Logan | | BMW | 3.0 CSL | | BMW | GTO |
| 86 | Kleinpeter / Goldleaf | Hugh Kleinpeter (USA) | Hugh Kleinpeter | De Tomaso | Pantera | | Ford | GTO |
| 87 | Thomas / Cook | R. Mandella (USA) | Rich Mandella | Porsche | 914 | /6 | Porsche | GTU |
| 90 | Reddy / Davey | Ray Walle Mazda | | Mazda | Cosmo | | Mazda | GTU |
| 91 | Bolanos / Sprowls / Lopez Negrete | Adams Apple (MEX) | Gustavo Bolanos | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 92 | Oest / Tillson | Oest-Tillson Racing (USA) | Dieter Oest/Mike Tillson | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 93 | Flynn / Bock | J. E. Logan (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 95 | Freyre / Yenko | | | Chevrolet | Camaro | | Chevrolet | GTO |
| 96 | Williamson / Pleasants / Gano | Mike Williamson | | Chevrolet | Camaro | | Chevrolet | GTO |
| 97 | Alspaugh / McVey | Jim Alspaugh (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 99 | Shafer / Crookston / Scott | George Shafer | | Datsun | 240Z | | Datsun | GTU |