| 0 | Frates / Ross / Buzbee | William Frates | | Datsun | 240Z | | Datsun | GTU |
| 04 | McGriff / McGriff | Hershel McGriff | | Chevrolet | Nova | | Chevrolet | G.I. |
| 08 | Williamson / Swope | Peak Oil | | AMC | Gremlin | | AMC | GTO |
| 1 | Westphal / Arutunoff / Goellnicht / *Spreadbury / *Zellmer / *Payne | Louis McAlpine | | BMW | 2002 | TI | BMW | GTU |
| 2 | Allison / Allison | Bobby Allison | | Chevrolet | Nova | | Chevrolet | G.I. |
| 4 | Bond / Kreider | Bill Nelson, Sr. (USA) | | Pontiac | Astre | | Pontiac | GTO |
| 6 | Craw / *Korman / *Peacock | Miller/Norburn | | BMW | 2002 | TI | BMW | GTU |
| 7 | Kamazuka / Fukuda / Cortez | Glen Marckwardt | | Mazda | RX-3 | | Mazda | GTU |
| 9 | Mabrito / Steel | Bruce Mabrito | | Datsun | 240Z | | Datsun | GTU |
| 10 | Zellmer / Goellnicht / Alsup / *Westphal | Louis McAlpine | | BMW | 2002 | TI | BMW | GTU |
| 11 | Evertz / Greger / Lässig | Sepp Greger | Egon Evertz | Porsche | 934 | | Porsche | Gr.5 |
| 12 | Schmid / Bartels / Martin / Evertz | Sepp Greger | | Porsche | 911 Carrera | RSR | Porsche | Gr.5 |
| 14 | Holbert / Ballot-Léna | George Dickinson/Holbert Porsche-Audi (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 15 | Garcia / Garcia / Garcia | Garcia Brothers (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 18 | Wolters / Gano / Castellano | Terry Wolters | | Chevrolet | Camaro | | Chevrolet | GTO |
| 19 | Gray / Burcham | Henley Gray | | Chevrolet | Laguna | | Chevrolet | G.I. |
| 20 | Weiss / Oleyar / Karl | Richard Weiss | | Porsche | 911 | S | Porsche | GTO |
| 21 | Pearson / Pearson / Bowsher / Bowsher | Jack Bowsher | | Ford | Torino | | Ford | G.I. |
| 22 | Long / Jobe / Startup | Bandag | Dennis Long | Chevrolet | Corvette | | Chevrolet | GTO |
| 23 | Kemp / *Posey / *Baird | Charlie Kemp (USA) | Charlie Kemp | Ford | Mustang | II Cobra | Ford | LM GTX |
| 24 | Hobbs / Parsons | BMW of North America (USA) | | BMW | 3.0 CSL | | BMW | GTO |
| 25 | Fitzpatrick / Walkinshaw | BMW of North America (USA) | | BMW | 3.0 CSL | | BMW | GTO |
| 28 | Goellnicht / Arutunoff / *Marina | Anatoly Arutunoff (USA) | | Lotus | Europa | | Ford | GTU |
| 29 | Mendez / Cowart / Panaccione | Charles Mendez | | Porsche | 911 | T | Porsche | GTU |
| 30 | Dyer / *Keyser | Heufeld Porsche (USA) | George Dyer | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 33 | Francis / Bebout | Glenn Francis | | Chevrolet | Chevelle | | Chevrolet | G.I. |
| 33A | Henny / Gardner | Phil Henny Racing (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 34 | Drolsom / Nagel | George Drolsom (USA) | George Drolsom | Porsche | 911 | S | Porsche | GTU |
| 35 | Mathey / Chamberlain / Loyning / *Shafer | Ted Mathey (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 36 | Brezinka / Hirsch / Hardacre | Rainer Brezinka (CDN) | Brian Hardacre | Porsche | 911 | S | Porsche | GTU |
| 40 | Fillingham / Sherk | Sam Fillingham | | Chevrolet | Corvette | | Chevrolet | GTO |
| 41 | Jones, Jr. / Faul | Jones Industries Racing (USA) | Herb Jones, Jr. | Chevrolet | Camaro | II | Chevrolet | GTO |
| 42 | Hindson / Davenport / Carney | BHR Porsche | | Porsche | 911 | S | Porsche | GTU |
| 43 | Graves / 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 |
| 46 | Daher / Leal / Madero | Jose Antonio Daher | | Ford | Mustang | | Ford | GTO |
| 47 | Bean / *Ansley | Williams Grainger | | Porsche | 911 | S | Porsche | GTU |
| 48 | Hylton / Childress | James Hylton | | Chevrolet | Laguna | | Chevrolet | G.I. |
| 49 | Potter / Gray / Sereix | Neil Potter (USA) | | Ford | Mustang | | Ford | GTO |
| 50 | van Beuren, Jr. / Rojas / Contreras | Hector Rebaque, Sr. | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 51 | Hotchkis / Kirby / Jones | Max Dial (USA) | Bob Kirby/Hitchcock | Porsche | 914 | /6 | Porsche | GTU |
| 52 | Bergstrom / Shaw / Palmer | CACI | | Honda | Civic | | Honda | GTU |
| 53 | Mollin / Speakman / *Gatoff | Arthur Mollin | | Volvo | 142 | S | Volvo | GTU |
| 54 | Job / Southard / Sahlman | Spirit Racing | | Porsche | 914 | /6 | Porsche | GTU |
| 55 | Ruttman / Baker / Behr | Car & Driver | | Dodge | Dart | | Dodge | GTO |
| 56 | Hagestad / Jolly | Bob Hagestad (USA) | Bob Hagestad | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 59 | Gregg / Redman / Fitzpatrick | BMW of North America (USA) | Peter Gregg | BMW | 3.0 CSL | | BMW | GTO |
| 60 | Bond / Tilton / Belperche | Rusty Bond | | Porsche | 911 | S | Porsche | GTU |
| 61 | Busby / Haywood | Brumos Porsche (USA) | Jim Busby | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 64 | Canada / *Boykin | C. C. Canada (USA) | C. C. Canada | Chevrolet | Camaro | I | Chevrolet | GTO |
| 65 | May / Mueller / Sauers | Stephen Isett | | Porsche | 911 | S | Porsche | GTU |
| 66 | Nehl / Behr | Tom Nehl (USA) | | Chevrolet | Monza | | Chevrolet | GTO |
| 67 | White / Harmstad / *McClain | David McClain (USA) | | Porsche | 914 | /6 | Porsche | GTU |
| 68 | Meldeau / McDill / Tremblay | Mike Meldeau | | Chevrolet | Camaro | | Chevrolet | GTO |
| 71 | Cord / Adams / Minter | Ken Starbird | | Ferrari | 365 GTB/4 | | Ferrari | GTO |
| 72 | Arnold / Levenson / *Brown | Bill Arnold (USA) | | Chevrolet | Corvette | C2 | Chevrolet | GTO |
| 73 | Howey / *Kester / *Crabtree | Howey Farms | | Chevrolet | Corvette | C2 | Chevrolet | GTO |
| 74 | Heimrath / Bienvenue / Ridgely | Ludwig Heimrath (CDN) | Ludwig Heimrath | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 75 | Christiansen / Hagan | Robert Christiansen (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 76 | Brockman / Greenwood | Greenwood Customercar Levitt Racing (USA) | Jim Levitt/John Greenwood | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 80 | Solomone / Maksym / Halverson | Carmon Solomone | | Chevrolet | Camaro | | Chevrolet | GTO |
| 81 | Berner / Goebbels / Hochreuter | Motex Auto (CDN) | | Porsche | 911 | S | Porsche | GTU |
| 84 | Dube / Zitza / Zitza | Mike Meldeau (USA) | | Porsche | 911 | S | Porsche | GTU |
| 85 | Hulen / Coupland / Engels / *Noyes | John E. Hulen (USA) | John Hulen | Porsche | 914 | /6 | Porsche | GTU |
| 86 | Kleinpeter / Goldleaf | Hugh Kleinpeter (USA) | Hugh Kleinpeter | De Tomaso | Pantera | | Ford | GTO |
| 88 | Carter / *Villeneuve | Maurice Carter (CDN) | | Chevrolet | Camaro | II | Chevrolet | GTO |
| 89 | Parish / Causey / Nelson | Barrick Motor Racing (USA) | | Porsche | 911 | S | Porsche | GTU |
| 90 | Walle / Reddy / Scott | Ray Walle | | Mazda | Cosmo | | Mazda | GTU |
| 91 | Miller / Ray | Debra Lynn Miller | | Chevrolet | Chevelle | | Chevrolet | G.I. |
| 92 | Tillson / Oest / Jennings | Oest/Tillson (USA) | Dieter Oest/Mike Tillson | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 93 | Flynn / Johnson | Jim E. Logan (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 96 | Williamson / Pleasants / Emig / Dula | Mike Williamson | | Chevrolet | Camaro | | Chevrolet | GTO |
| 97 | Bolanos / Sprowls / Bolanos | Juan Carlos Bolanos (MEX) | Gustavo Bolanos | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 98 | Negre / Mitchell / Merzario | Ed Negre | | Dodge | Charger | | Dodge | G.I. |
| 99 | Currin / Gottlob / Knab | Phil Currin (USA) | Cliff Gottlob | Chevrolet | Corvette | | Chevrolet | GTO |