| 0 | Minter / Ballot-Léna / Gagliardi | North American Racing Team (USA) | | Ferrari | 365 GTB/4 | | Ferrari | GTO | GT |
| 00 | Corwin / Mull | Jim Corwin (USA) | | Chevrolet | Camaro | | Chevrolet | | T |
| 1 | Ballot-Léna / *Cudini / *Minter | North American Racing Team (USA) | | Ferrari | 365 GT4/BB | | Ferrari | GTO | S |
| 4 | Webbe / Dickinson / Theodoracopulos | Bill Webbe (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 5 | Rojas / Rebaque / van Beuren, Jr. | Hector Rebaque (MEX) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 7 | Johnson / Coleman / Shaw | Levi's Team Highball (USA) | Amos Johnson | AMC | Gremlin | | AMC | GTO | T |
| 9 | Bolanos / Heyer / Jourdain | Juan Carlos Bolanos (MEX) | Gustavo Bolanos | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 11 | Keyser / Sprowls / Contreras | Toad Hall (USA) | Michael Keyser | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 12 | Hughes / Whitaker / Geisel | Precision Performance (USA) | | Datsun | 510 | | Datsun | GTU | T |
| 13 | Townsend / Thomas / Papke | Randolph Townsend (USA) | Juan Carlo Bolanos | Porsche | 911 Carrera | RSR | Porsche | GTO | S |
| 14 | Holbert / Forbes-Robinson | Porsche-Audi USA (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 15 | Garcia / Garcia | Garcia Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO | GT |
| 16 | Spruell / Bean | Bill Bean (USA) | Paul Spruell | Porsche | 911 | S | Porsche | GTU | GT |
| 17 | Gimondo / Heinz / Everett | Takondo Racing (USA) | | Chevrolet | Camaro | II | Chevrolet | GTO | T |
| 18 | Thompson / Bach / Yenko | Jerry Thompson (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO | GT |
| 20 | John Morton | Francisco Mir | | Ferrari | 365 GTB/4 | | Ferrari | | GT |
| 23 | Kemp / Baird | Armor All (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 24 | Posey / Stuck | BMW of America | | BMW | 3.0 CSL | | BMW | GTO | T |
| 25 | Peterson / *Redman | BMW of America (D) | | BMW | 3.0 CSL | | BMW | GTO | T |
| 26 | Williamson / Cosentino / Gano | Al Cosentino | | Chevrolet | Camaro | | Chevrolet | GTO | T |
| 27 | Ward / Henny / Barnett | Jon Ward (USA) | | Chevrolet | Camaro | II | Chevrolet | GTO | GT |
| 28 | Arutunoff / Goellnicht / Gebhardt | Anatoly Arutunoff (USA) | | Lotus | Europa | | Ford | Gr.4 | GT |
| 29 | Mabrito / Steel | Bruce Mabrito | | Datsun | 240Z | | Datsun | GTU | GT |
| 30 | Bienvenue / Dyer | George Dyer (USA) | George Dyer | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 32 | Mroz / Mroz | Roaring Moose | | Ford | Mustang | | Ford | GTO | T |
| 32 | Greger / Sindel / Schmid | Sepp Greger | | Porsche | 911 Carrera | RSR | Porsche | | GT |
| 34 | Drolsom / Nagel | George Drolsom (USA) | George Drolsom | Porsche | 911 | S | Porsche | GTU | GT |
| 41 | Jones, Jr. / Currin / Faul | Herb Jones, Jr. (USA) | Herb Jones, Jr. | Chevrolet | Camaro | II | Chevrolet | GTO | T |
| 42 | Carusso / Vreeland / *Sereix | John Carusso (USA) | John Carusso | Chevrolet | Corvette | C3 | Chevrolet | GTO | GT |
| 43 | O'Steen / Helmick / Graves | Escar (USA) | Dave Helmick | Porsche | 911 Carrera | RSR | Porsche | GTO | S |
| 44 | Freyre / Naon / Garcia | Delta Racing | | Porsche | 911 | S | Porsche | GTU | S |
| 45 | Ramirez / Mutiz / Montalvo / Alvarez | Delta Racing | | Porsche | 911 | S | Porsche | GTU | GT |
| 46 | Buzbee / Ross / Frates | Spencer Buzbee | | Datsun | 240Z | | Datsun | GTU | GT |
| 51 | Jones / Kirby / Hotchkis | Johnson-Bozzoni Porsche-Audi | | Porsche | 914 | /6 | Porsche | GTU | GT |
| 52 | Punch / Rulon-Miller / Waugh | Doell Enterprises | Brant Doell | Porsche | 911 | S | Porsche | GTU | GT |
| 55 | Lee Cutler | Cutler/Pickens | | Porsche | 914 | /6 | Porsche | | GT |
| 56 | Jones / Mignot / Grandet | North American Racing Team? (USA) | | Ferrari | 365 GTB/4 | | Ferrari | GTO | GT |
| 59 | Gregg / Haywood | Brumos Porsche (USA) | Peter Gregg | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 60 | Bond / Rollin / Belperche | Rusty Bond | | Porsche | 911 | S | Porsche | GTU | GT |
| 64 | Canada / Boykin / Levetto | Russ Boykin (USA) | C. C. Canada | Chevrolet | Camaro | I | Chevrolet | GTO | T |
| 67 | McClain / White / *Harmstad | David McClain (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO | S |
| 69 | Coleman / Johnson | Coleman/Johnson (USA) | | Chevrolet | Vega | | Chevrolet | | S |
| 71 | Woodner / Phillips | North American Racing Team (USA) | | Ferrari | 365 GTB/4 | | Ferrari | Gr.4 | GT |
| 72 | Jimenez / *Zambrano / *Lambreton | Cafe Mexicana Racing | | Mazda | RX-2 | | Mazda | GTU | T |
| 73 | Arnold / Biernerth | Bill Arnold (USA) | | Chevrolet | Corvette | C2 | Chevrolet | GTO | GT |
| 75 | Greenwood / Muzzin / Shafer | John Greenwood (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO | GT |
| 83 | Mollin / Gatoff / Riley | Arthur Mollin (USA) | | Volvo | 142 | S | Volvo | GTU | T |
| 84 | Selbert / Biggs | Klaus Selbert | | Porsche | 911 | S | Porsche | GTU | GT |
| 85 | Hulen / Coupland / Engels | John E. Hulen (USA) | John Hulen | Porsche | 914 | /6 | Porsche | GTU | GT |
| 87 | DeLorenzo / Brown / Carter | Carter Racing Services (CDN) | | Chevrolet | Camaro | II | Chevrolet | GTO | T |
| 88 | Carter / Felton | Carter Racing Services (CDN) | | Chevrolet | Camaro | II | Chevrolet | GTO | T |
| 89 | Parish / Countryman / Secher | Barrick Motor Racing (USA) | | Porsche | 911 | S | Porsche | GTU | GT |
| 90 | Walle / Reddy | Ray Walle (USA) | Ray Walle | Mazda | RX-3 | | Mazda | GTU | T |
| 92 | Tillson / Oest | Oest/Tillson (USA) | Dieter Oest/Mike Tillson | Porsche | 911 Carrera | RSR | Porsche | GTO | S |
| 95 | de Izaurieta / Tabe / Martinez | Hector Rebaque (MEX) | Hector Rebaque | Porsche | 911 Carrera | RSR | Porsche | GTO | S |
| 98 | Alspaugh / Persinger | James W. Persinger (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO | GT |
| 110 | Nehl / Moise | Automotive Engineering (USA) | | Chevrolet | Camaro | II | Chevrolet | GTO | T |