| 03 | Dann / Bond | Ozone Industries (USA) | | Opel | GT | 1900 | Opel | GTU |
| 1 | Keyser / Sprowls / Contreras | Toad Hall Racing (USA) | Michael Keyser | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 2 | Muniz / *Gerber / *Muniz | Daniel Muniz (MEX) | | BMW | 3.0 CSL | | BMW | GTO |
| 3 | Theodoracopulos / Barber | Ippocampos Racing (USA) | Harry Theodoracopulos | Ford | Capri | RS 3100 | Ford | GTO |
| 4 | Dickinson / Webbe / Theodoracopulos | George Dickinson (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 5 | Harmon / Woodner | Bob Harmon (USA) | Bob Harmon | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 6 | Cook / Bryan / McDill | Byron Cook | | Chevrolet | Camaro | | Chevrolet | GTO |
| 8 | Beasley / Jennings | Bob Beasley (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 9 | Ansley / *Connelly / *Woodall | Tony Ansley (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 10 | Gebhardt / Beilcke / Grinbold | Alf Gebhardt (USA) | | BMW | 2002 | | BMW | GTU |
| 12 | Smith / Young / Aiken | Ford Smith (USA) | Ford Smith | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 14 | Holbert / Forbes-Robinson | Holbert's Porsche-Audi (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 17 | Gimondo / Tremblay | Vince Gimondo (USA) | | Chevrolet | Camaro | II | Chevrolet | GTO |
| 18 | Wolters / Swanson | Terry Wolters | | Chevrolet | Camaro | | Chevrolet | GTO |
| 22 | Kreider / DeMarco | Dale Kreider (USA) | Dale Kreider | Chevrolet | Corvette | | Chevrolet | GTO |
| 23 | Kemp / Baird | Armorall Racing Team (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 24 | Stuck / Posey | BMW Motorsport (D) | | BMW | 3.0 CSL | | BMW | GTO |
| 25 | Stuck / Redman / Moffat / Posey | BMW Motorsport (D) | | BMW | 3.0 CSL | | BMW | GTO |
| 26 | Chitwood / Chitwood | Tim Chitwood (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 27 | Davis / Almeida / DeGirolamo | Robert E. Davis | | Chevrolet | Corvette | | Chevrolet | GTO |
| 28 | Fernandez / Gonzalez / Chevres | Bonky Fernandez | | Lotus | Elan | | | GTU |
| 29 | Mabrito / Steel | Bruce Mabrito | | Datsun | 240Z | | Datsun | GTU |
| 30 | Dyer / Bienvenue | George Dyer (USA) | George Dyer | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 31 | Garcia, Jr. / Arzeno / Gonzalez | Luiz Garcia, Jr. | | BMW | 2002 | | BMW | GTU |
| 32 | Orr / Jobe | E. F. Miller & Co. (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 33 | Quintanilla / Loring | Roberto Quintanilla | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 34 | Drolsom / Nagel | George Drolsom (USA) | George Drolsom | Porsche | 911 | S | Porsche | GTU |
| 37 | Fraser / Archer | Tom Fraser | | Datsun | 510 | | Datsun | GTU |
| 38 | Boza / Diaz / Garrido | Roberto Boza | | Chevrolet | Camaro | | Chevrolet | GTO |
| 39 | Donley / Scott / Smith | Dean Donley | | MG | B | | BMC | GTU |
| 40 | Hastings / Bunch | John Hastings (USA) | | Jaguar | E-type | | Jaguar | GTO |
| 41 | Jones, Jr. / Currin / Faul | Herb Jones, Jr. (USA) | Herb Jones, Jr. | Chevrolet | Camaro | II | Chevrolet | GTO |
| 43 | Graves / O'Steen / Helmick | Ecurie Escargot (USA) | Dave Helmick | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 44 | Garcia / Naon / Freyre | Montura Ranch Estates | | Porsche | 911 | S | Porsche | GTU |
| 45 | Ramirez / Mutiz / DeNarvaez | Delta Racing | | Porsche | 911 | S | Porsche | GTU |
| 46 | Buzbee / Ross / Frates | Buzbee Tropical Fish | | Datsun | 240Z | | Datsun | GTU |
| 47 | Groleau / Brent / Sweeney | Jacques Groleau | | Datsun | 240Z | | Datsun | GTU |
| 48 | Carusso / Vreeland / Sereix | John Carusso (USA) | John Carusso | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 49 | Potter / Gray / Keller | Neil Potter (USA) | | Ford | Mustang | | Ford | GTO |
| 50 | Vazquez / Quintana / Yenko | Pedro Vasquez, Jr. (USA) | | Porsche | 911 | S | Porsche | GTU |
| 51 | Hotchkis / Kirby / Jones | Johnson-Bozzoni Porsche-Audi | | Porsche | 914 | /6 | Porsche | GTU |
| 52 | Kleinschmidt / Andrus / Culpepper | Charles Kleinschmidt (USA) | | MG | B | | BMC | GTU |
| 53 | Mollin / Riley | Arthur Mollin (USA) | | Volvo | 142 | S | Volvo | GTU |
| 54 | Tunstall / Jenkins | Southpoint Porsche | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 55 | Simon / Stumpff / Molina | Henry Simon | | Ford | Mustang | | Ford | GTO |
| 56 | Gano / Williamson / Parson | Charles Gano | | Chevrolet | Camaro | | Chevrolet | GTO |
| 57 | Hinze / Grossman | Marty Hinze (USA) | | De Tomaso | Pantera | GT4 | Ford | GTO |
| 58 | Oyler / Church / *Aden | Professional Paint & Body | | Renault | 12 | | Renault | GTU |
| 59 | Gregg / Haywood | Brumos Porsche-Audi (USA) | Peter Gregg | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 60 | Bond / Rollin / Belperche | Rusty Bond | | Porsche | 911 | S | Porsche | GTU |
| 61 | Parker / LaMay / Morgan | Larry Parker | | Ford | Pinto | | Ford | GTU |
| 62 | Chapman / Hood / Dumont | Scott Chapman | | Chevrolet | Corvette | | Chevrolet | GTO |
| 63 | Punch / Waugh / Mendenhall | Doell Enterprises | Brant Doell | Porsche | 911 | S | Porsche | GTU |
| 65 | Valhuerdi / Mendez / Garcia | Ahmed Valhuerdi (USA) | | Shelby | GT350 | | Ford | GTO |
| 66 | Craw / Norburn | Miller & Norburn (USA) | | BMW | 2002 | TI | BMW | GTO |
| 67 | McClain / White | David McClain (USA) | | Porsche | 911 Carrera | S | Porsche | GTU |
| 68 | Febles / Cruz | Diego Febles Racing (PR) | Diego Febles | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 69 | Montalvo / *Grob | Juan Montalvo | | Ford | Escort | I | Ford | GTU |
| 70 | Kuenz / Elgie | Starbrite | | Datsun | 510 | | Datsun | GTU |
| 71 | Johnson / Shaw | Levi's Team Highball (USA) | Amos Johnson | AMC | Gremlin | | AMC | GTO |
| 72 | Arnold / Doran | Bill Arnold (USA) | | Chevrolet | Corvette | C2 | Chevrolet | GTO |
| 73 | Christiansen / Myers | Robert Christiansen (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 74 | Ridgely / Heimrath | Ludwig Heimrath (CDN) | Ludwig Heimrath | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 75 | Greenwood / Thompson | John Greenwood (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 76 | Greenwood / Voeltz / English | Kidd-America Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 77 | Noseda / Mummery / *Small | Ralph Noseda (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 78 | Ross / Beres | Tom Ross | | Ford | Mustang | | Ford | GTO |
| 79 | Callas / Cook / Gang | Michael Callas | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 81 | Craven / Horniman | Dean Craven | | Ford | Pinto | | Ford | GTU |
| 82 | Scott / MacDonald / Neuhoff | Bill Scott Racing | | AMC | Gremlin | | AMC | GTO |
| 83 | McAlpine / Miller / Hardling | PPC Racing | | Austin | Mini Cooper | | BMC | GTU |
| 84 | Speakman / Maffucci | Bob Speakman (USA) | Bob Speakman | Datsun | 240Z | | Datsun | GTU |
| 85 | Hulen / Coupland / Causey | John E. Hulen (USA) | John Hulen | Porsche | 914 | /6 | Porsche | GTU |
| 86 | Stefl / Fordyce | Dennis Stefl | | Chevrolet | Corvette | | Chevrolet | GTO |
| 87 | Jones / Mignot | Jones Motorsports (USA) | | Ferrari | 365 GTB/4 | | Ferrari | GTO |
| 88 | Carter / DeLorenzo | Maurice Carter (CDN) | | Chevrolet | Camaro | II | Chevrolet | GTO |
| 90 | Walle / Reddy | Ray Walle Mazda (USA) | Ray Walle | Mazda | RX-3 | | Mazda | GTU |
| 91 | Bolanos / Jourdain / Bolanos | Bolanos Racing (MEX) | Gustavo Bolanos | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 92 | Tillson / Oest | Oest-Tillson Racing (USA) | Dieter Oest/Mike Tillson | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 95 | Tabe / Marron / Martinez | Sergio Tabe (MEX) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 96 | Ted Kempgens | Bobby Diehl | | Chevrolet | Corvette | | Chevrolet | GTO |
| 98 | Gottlob / Yates | Cliff Gottlob (USA) | Cliff Gottlob | Chevrolet | Corvette | | Chevrolet | GTO |
| 111 | Minter / Wietzes | North American Racing Team (USA) | | Ferrari | 365 GT4/BB | | Ferrari | GTO |
| 914 | Schmid / Bundy | Holbert's Porsche-Audi | | Porsche | 914 | | Porsche | GTU |