| 0 | Ongais / Field / Haywood | Vasek Polak/Interscope Racing (USA) | Ted Field | Porsche | 934 | /5 | Porsche | GTO |
| 00 | Ongais / Field | Interscope Racing (USA) | Ted Field | Porsche | 934 | /5 | Porsche | GTO |
| 01 | Bergstrom / Cook | Sports Ltd. Racing (USA) | Bob Bergstrom | Porsche | 911 | S | Porsche | GTU |
| 03 | Oyler / Muratti / Smit / *Pesquera | | | Renault | 12 | | Renault | GTU |
| 04 | Kreider / DeMarco | Bill Nelson, Sr. | | Pontiac | Astre | | Pontiac | GTO |
| 05 | Trueman / Thompson / Yenko | Red Roof Inns, Inc. (USA) | Jim Trueman | Chevrolet | Monza | | Chevrolet | GTO |
| 06 | Panaccione / Mesnick / Roehrig | Morrison's Inc. | J. Dana Roehrig | Porsche | 911 | T | Porsche | GTU |
| 07 | Mendez / Cowart | Morrison's Inc. | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 08 | Wolters / Pleasants | Busch Beer (USA) | Terry Wolters | Porsche | 911 | S | Porsche | GTU |
| 09 | Gunn / Belcher | Belcher Racing (USA) | | Porsche | 934 | /5 | Porsche | GTO |
| 1 | Keyser / Jones / *O'Steen / *Kendrick / *Haywood | Harry Jones (USA) | | Ferrari | 365 GTB/4 | | Ferrari | GTO |
| 2 | Freeman / Newman | Bill Freeman (USA) | William Freeman | Porsche | 911 | S | Porsche | GTU |
| 4 | Leuzinger / Redszus / Van der Werff | B. R. Racing | | De Tomaso | Pantera | | Ford | GTO |
| 5 | Vazquez / Wolfe / *Weiss | Pedro Vazquez (USA) | | Porsche | 911 | S | Porsche | GTU |
| 7 | Arutunoff / Marina / Goellnicht | Hallet Motor Racing Circuit (USA) | Anatoly Arutunoff | Lancia | Stratos | HF | Ferrari | GTU |
| 8 | Beasley / Stone | Bob Beasley (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 9 | Bartling / Bytzek | Bytzek Automotive (CDN) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 10 | Berner / Goebbels | Motex Auto (CDN) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 11 | Nylander / Nylander / Hammond | Motoring Enthusiasts | | Porsche | 911 | S | Porsche | GTU |
| 15 | Garcia / Baldwin / Garcia | Javier Garcia (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 17 | Chitwood / Gimondo / Chitwood | Chitwood Racing (USA) | Tim Chitwood | Chevrolet | Nova | | Chevrolet | AC |
| 18 | Swanson / Miller | Terry Wolters | | Chevrolet | Camaro | | Chevrolet | GTO |
| 19 | Felton / Bostyan / *Kessler | Richard Bostyan | Richard Bostyan | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 20 | DiLella / Cueto | Vince DiLella (USA) | | Porsche | 914 | /4 | VW | GTU |
| 22 | King / Lehew / *Lehew | Angel's Auto World (USA) | | Datsun | 240Z | | Datsun | GTU |
| 24 | Frank / Shafer | Executive Industries (USA) | Tom Frank | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 26 | McAlpine / Smith | Alfa Romeo South (USA) | | Alfa Romeo | Alfetta GTV | | Alfa Romeo | GTU |
| 27 | Mummery / Refenning / Hamilton | Miami Auto Racing (USA) | | Porsche | 911 | S | Porsche | GTU |
| 28 | Budd / Johnston / *Spruell | Paul Spruell | | Alfa Romeo | Alfetta GT | | Alfa Romeo | GTU |
| 29 | Fernandez / Godinez / Ferrer | Bonky Fernandez | | Lotus | Elan | | | GTU |
| 30 | Dyer / Frisselle | George Dyer Racing (USA) | George Dyer | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 31 | Bowden / Tumbleston / LaGrow | Kenneth LaGrow | | Chevrolet | Camaro | | Chevrolet | GTO |
| 36 | Almeida / Rodriguez / Quintana | Motorcito Racing | | Chevrolet | Camaro | | Chevrolet | GTO |
| 37 | Walriven / Helson | (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 38 | Paul / *O'Steen / *Graves / *Hagestad | John Paul Sr. (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 39 | Doran / Barnett / Pelz | Wiley Doran (USA) | Wiley Doran | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 40 | Heinz / Shulnburg / *Brandt | Shulnburg Scrap Metal (USA) | R. V. Shulnburg | Chevrolet | Corvette | | Chevrolet | GTO |
| 41 | Jones, Jr. / Faul | Jones Ind. Racing (USA) | Herb Jones, Jr. | Chevrolet | Camaro | II | Chevrolet | GTO |
| 44 | Potter / Boyer | Neil Potter | | Ford | Mustang | | Ford | GTO |
| 46 | DeNarvaez / Naon | Mauricio DeNarvaez (CO) | Mauricio DeNarvaez | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 48 | Carusso / Sereix / Donaldson / *St. James | Autodyne (USA) | John Carusso | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 49 | Fillingham / Jones / Williamson / *Schmidt | Fillingham Racing | | Chevrolet | Corvette | | Chevrolet | GTO |
| 50 | Hirsch / Hochreuter / Brezinka | Motex Auto (CDN) | | Porsche | 911 | S | Porsche | GTU |
| 51 | Kirby / Hotchkis | Kirby-Hitchcock Racing (USA) | Bob Kirby/Hitchcock | Porsche | 914 | /6 | Porsche | GTU |
| 52 | Kleinschmidt / Levetto | Charles Kleinschmidt (USA) | | MG | B | GT | BMC | GTU |
| 54 | Sahlman / Henn / Cook | Spirit Racing | | Porsche | 914 | /6 | Porsche | GTU |
| 55 | Fitzgerald / Thompkins | Rick Thompkins (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 57 | Tunstall / *Wade | Starbrite | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 58 | Febles / Cruz | Diego Febles Racing (PR) | Diego Febles | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 60 | Bond / Tilton / *Thomas | R & R Racing | | Porsche | 911 | S | Porsche | GTU |
| 61 | Busby / Gregg | Brumos Racing (USA) | Jim Busby | Porsche | 934 | /5 | Porsche | GTO |
| 64 | Bondurant / Smothers / Minter | Ramsey Ferrari of SF (USA) | Otto Zipper | Ferrari | 365 GTB/4 | | Ferrari | GTO |
| 65 | Morton / Carradine | Modena Sports Cars | David Carradine | Ferrari | 365 GTB/4 | | Ferrari | GTO |
| 66 | Noseda / Small / Loving | Ralph Noseda | | Chevrolet | Camaro | | Chevrolet | GTO |
| 67 | White / McClain | Havatampa Cigars (USA) | | Porsche | 911 Carrera | S | Porsche | GTU |
| 68 | Currin / Hay / Hoskins | Rick Hay (USA) | Rick Hay | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 70 | Speer / Turley / *Sahlman | Race Car (USA) | | Porsche | 911 | S | Porsche | GTU |
| 71 | Bagley / Mead / *Knab | The Foreign Exchange | | Porsche | 911 | S | Porsche | GTU |
| 72 | Arnold / Hagan | Bill Arnold (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 73 | Howey / Koch / Crabtree | Howey Farms | | Chevrolet | Corvette | C2 | Chevrolet | GTO |
| 75 | Christiansen / DeLay | Bob Christiansen (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 76 | Greenwood / Greenwood / Mancuso | Mancuso Chevrolet (USA) | Rick Mancuso | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 77 | Jennings / Bean | Bruce Jennings (USA) | Bruce Jennings | Porsche | 911 | S | Porsche | GTU |
| 78 | Francis / Matienzo / Nowling | | | Chevrolet | Camaro | | Chevrolet | GTO |
| 79 | Nooe / *Stricklin | | | Shelby | GT350 | | Ford | GTO |
| 80 | Lang / Solomone | Carmon Solomone | | Chevrolet | Camaro | | Chevrolet | GTO |
| 82 | Ross / Tavilla | Tom Ross | | Ford | Mustang | | Ford | GTO |
| 83 | Delano / Barringer | Bill Scott Racing (USA) | | Porsche | 911 | S | Porsche | GTU |
| 85 | Hulen / Coupland / Causey | John Hulen (USA) | John Hulen | Porsche | 914 | /6 | Porsche | GTU |
| 86 | Kleinpeter / Stevens | H. I. Kleinpeter (USA) | Hugh Kleinpeter | De Tomaso | Pantera | | Ford | GTO |
| 88 | Borsos / *Aase | (USA) | | Porsche | 911 | S | Porsche | GTU |
| 91 | Werl / Miller / Slodowick | Fred Werl (USA) | | Ford | Mustang | | Ford | GTO |
| 92 | Tillson / Olimpi | Mike Tillson Motor Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 93 | Tolman / Fitzgerald / Brockman | Ralph Tolman | | Lotus | Europa | | | GTU |
| 94 | Ansley / Gano / Connelly | Tony Ansley (USA) | | Chevrolet | Corvette | | Chevrolet | GTO |
| 95 | Hinze / Davis | Robert E. Davis | | Chevrolet | Corvette | | Chevrolet | GTO |
| 98 | Montalvo / Garcia / DeCardenas | Conrad Racing | | Porsche | 911 | S | Porsche | GTU |
| 99 | Shafer / Shafer / Scott / *Crookston | George Shafer/Craig Shafer | | Datsun | 240Z | | Datsun | GTU |