| 1 | Jarier / Beltoise | Equipe Matra (F) | | Matra | MS670 | C | Matra | S3.0 | |
| 2 | Pescarolo / Larrousse / *Beltoise | Equipe Matra (F) | | Matra | MS670 | C | Matra | S3.0 | |
| 3 | Theodoracopulos / Kwech | Harry Theodoracopulos (USA) | Harry Theodoracopulos | Ford | Capri | RS 3100 | Ford | - | Trans-Am |
| 5 | Keyser / Minter | Toad Hall Motor Racing (USA) | Michael Keyser | Porsche | 911 Carrera | RSR 3.0 | Porsche | GT | Trans-Am |
| 9 | Müller / van Lennep | Martini Racing/Porsche System (D) | | Porsche | 911 Carrera RSR Turbo | | Porsche | S3.0 | |
| 13 | Agor / Nichter | Warren Agor Racing Enterprises (USA) | Warren Agor | Chevrolet | Camaro | II | Chevrolet | - | Trans-Am |
| 14 | Holbert / Forbes-Robinson | Holbert's Porsche-Audi (USA) | Al Holbert | Porsche | 911 Carrera | RSR 3.0 | Porsche | - | Trans-Am |
| 16 | Aase / Patrick | Aase Brothers (USA) | | Porsche | 908/02 | K Flunder | Porsche | S3.0 | |
| 24 | Buffum / Follmer / Lunger / *Petery | Hurtig Team Libra (USA) | | BMW | 3.0 CSL | | BMW | - | Trans-Am |
| 25 | Everett / Morton | Bobcor (USA) | | Alfa Romeo | Montreal | | Alfa Romeo | - | Trans-Am |
| 30 | Davidson / Witzenburg | Davidson Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | Trans-Am |
| 34 | Posey / Hobbs / Forbes-Robinson | Ted Trudon Porsche - Audi, Inc. | | Porsche | 911 Carrera | RSR | Porsche | GT | Trans-Am |
| 35 | McAlpine / Bagley | Louis McAlpine (USA) | | Datsun | 510 | | Datsun | GT | Trans-Am |
| 36 | Miller / Miller | Miller Brothers Racing Enterprises (USA) | | Chevrolet | Camaro | | Chevrolet | - | Trans-Am |
| 39 | Gerre Payvis | Gerre Payvis (USA) | | Ford | Mustang | | Ford | - | Trans-Am |
| 42 | Follmer / Lunger | Hurtig Team Libra (USA) | | BMW | 3.0 CSL | | BMW | - | Trans-Am |
| 43 | O'Steen / Graves / Helmick | International Performance Center, Inc. (USA) | John Graves | Porsche | 911 Carrera | RS | Porsche | GT | Trans-Am |
| 44 | Jim Briody | International Performance Center, Inc. (USA) | Bob Nevins | Lotus | Europa | | | GT | Trans-Am |
| 46 | Carter / Laughlin | Craig Carter Racing (USA) | Craig Carter | Chevrolet | Camaro | II | Chevrolet | - | Trans-Am |
| 54 | Hiss / Cudini | North American Racing Team (USA) | | Ferrari | 365 GTB/4 | | Ferrari | GT | Trans-Am |
| 55 | Hiss / Cudini | North American Racing Team (USA) | | Ferrari | 365 GTB/4 | | Ferrari | GT | Trans-Am |
| 57 | Grossman / Young / Zeccoli | F. J. Maka Racing (USA) | Frank Maka | De Tomaso | Pantera | GT4 | Ford | GT | Trans-Am |
| 59 | Gregg / Haywood | Brumos Porsche-Audi Corp. (USA) | Peter Gregg | Porsche | 911 Carrera | RSR 3.0 | Porsche | - | Trans-Am |
| 60 | Merzario / Andretti | Autodelta (I) | | Alfa Romeo | T33/TT/12 | | Alfa Romeo | S3.0 | |
| 61 | Oleyar / Feinstein | Feinstein Racing Enterprises (USA) | | Chevrolet | Corvette | | Chevrolet | - | Trans-Am |
| 64 | Bob Baechle | C. Weaver Chevrolet (USA) | Ronald Weaver | Chevrolet | Corvette | C3 | Chevrolet | - | Trans-Am |
| 65 | Bienvenue / Dancose | Jacques Bienvenue (CDN) | | Porsche | 911 Carrera | RSR | Porsche | - | Trans-Am |
| 70 | Stommelen / Andretti | Autodelta (I) | | Alfa Romeo | T33/TT/12 | | Alfa Romeo | S3.0 | |
| 74 | Heimrath / Cook | Heimrath Turbo, Inc. (CDN) | Ludwig Heimrath | Porsche | 911 Carrera | RSR 3.0 | Porsche | - | Trans-Am |
| 82 | Garcia-Veiga / Waco / Monguzzi | Francisco Mir Racing Team (USA) | | Ferrari | 365 GTB/4 | | Ferrari | - | Trans-Am |
| 86 | Kleinpeter / Goldleaf | Promotional Advertising Corp. (USA) | Hugh Kleinpeter | De Tomaso | Pantera | | Ford | - | Trans-Am |
| 87 | Rynone / Wiernicki / Wiernicki | Rynone Industries (USA) | Tom Rynone | Chevrolet | Corvette | C3 | Chevrolet | - | Trans-Am |
| 88 | DeLorenzo / Carter | Mo Carter Firestone Performance Centre (CDN) | | Chevrolet | Camaro | II | Chevrolet | - | Trans-Am |
| 91 | Pierce / Mills | Roger Pierce Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | Trans-Am |
| 92 | Oest / Tillson / Higgins | Oest-Tillson Racing (USA) | Dieter Oest/Mike Tillson | Porsche | 911 Carrera | RSR | Porsche | GT | Trans-Am |
| 95 | Barber / Hagestad | Robert Hagestad (USA) | Bob Hagestad | Porsche | 911 Carrera | RSR 3.0 | Porsche | - | Trans-Am |
| 99 | Fisher / Dupont | Professional Racing Associates (USA) | | Chevron | B23 | | Ford | S2.0 | |
| 110 | Mitchell / Nehl | Bolus & Snopes, Ltd. (USA) | | Chevrolet | Camaro | II | Chevrolet | - | Trans-Am |