| 01 | Morton / Klausler | Marketing Corporation of America (USA) | | Ford | Mustang | | Ford | GTO |
| 02 | Bucknum / Bright | Marketing Corporation of America (USA) | | Ford | Mustang | | Ford | GTO |
| 03 | Lee / Lee / Myers | Bob's Speed Products | | Ford | Maverick | | Ford | GTO |
| 04 | DiLella / Cueto | Di Lella Racing (USA) | | Porsche | 911 | | Porsche | GTU |
| 05 | Almeida / Soto | T & R Racing (USA) | Tico Almeida | Porsche | 935 | M16 | Porsche | GTP |
| 06 | Lopez / Mendez | Juan Lopez | | Porsche | 911 Carrera | | Porsche | GTO |
| 07 | Flaquer / Londono / *Londono / *Rodriguez | Londono Bridge Racing (CO) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 08 | Diehl / Newsome | Diehl Hi Pro Enterprises | | Mazda | RX-7 | | Mazda | GTU |
| 09 | Bell / Andretti / Paul, Jr. | Henn's Swap Shop Racing (USA) | Preston Henn | Porsche | 935 | L | Porsche | GTP |
| 2 | Hinze / Lanier / Wolters | Hinze Fencing (USA) | Marty Hinze | Porsche | 935 | K3 | Porsche | GTP |
| 3 | McKitterick / Minter | Grid Motor Racing (GB) | | Grid | S1 | | Ford | GTP |
| 4 | Hagan / Felton / Moses / Frink | Stratagraph (USA) | Billy Hagan | Chevrolet | Camaro | III | Chevrolet | GTO |
| 5 | Akin / Whittington / O'Steen | Bob Akin Motor Racing (USA) | Bob Akin | Porsche | 935 | K3/80 | Porsche | GTP |
| 6 | Shafer / Shafer / Maloy | Shafer Motor Racing (USA) | Craig Shafer | Chevrolet | Camaro | II | Chevrolet | GTO |
| 7 | Halsmer / Knoop | Racing Beat | | Mazda | RX-7 | | Mazda | GTO |
| 8 | Shelton / Shelton / *Bell | Shelton Ferrari | | Ferrari | 512 BB | /LM | Ferrari | GTP |
| 9 | Baker / Mullen / Nierop | Personalized Autohaus (USA) | Wayne Baker | Porsche | 934 | | Porsche | GTO |
| 10 | Kent-Cooke / Adams / Garza | Cooke Racing (USA) | Ralph Kent-Cooke | Lola | T600 | | Chevrolet | GTP |
| 11 | Goral / Figaro / Uria | Paul Goral (USA) | Paul Goral | Porsche | 911 | | Porsche | GTU |
| 12 | Cummings / Rubright / Gano | The Cummings Marque | | Chevrolet | Monza | | Chevrolet | GTP |
| 13 | Fassler / Pope / Shafer | Oftedahl Racing (USA) | Gordon Oftedahl | Pontiac | Firebird | | Pontiac | GTO |
| 14 | Shafer / Ramirez / Meldeau | Oftedahl Racing (USA) | | Pontiac | Firebird | | Pontiac | GTO |
| 15 | Lutz / Brummer / Connor | DL Performance Engineering (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 16 | Hinze / Lanier / Wolters | Hinze Fencing (USA) | Marty Hinze | March | 82G | | Chevrolet | GTP |
| 17 | Dingman / *Bighouse | Dingman Bros. Racing (USA) | Dingman Brothers | Chevrolet | Corvette | | Chevrolet | GTP |
| 18 | Lista / Marks / Newsome / Diehl | Diehl Hi-Pro | | Chevrolet | Camaro | | Chevrolet | GTO |
| 19 | Van Every / Tisdelle | Van Every Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 20 | Canary / Sanborn | Paul Canary Racing (USA) | | Pontiac | Firebird | | Pontiac | GTO |
| 21 | Gonzalez / Olson / *Fernandez | Nimrod Racing (GB) | | Nimrod | NRA/C2 | | Aston Martin | GTP |
| 22 | Smith / St. James / Olson | Nimrod Racing (GB) | | Nimrod | NRA/C2 | | Aston Martin | GTP |
| 23 | Selby / Roe | Roe/Selby (USA) | Earl Roe/Tim Selby | Porsche | 911 Carrera | RSR | Porsche | GTU |
| 24 | Speer / Madren / Ratcliff | Pegasus III Racing (USA) | Martin L. Speer | Porsche | 935 | JLP-2 | Porsche | GTP |
| 25 | Cowart / Miller / DeNarvaez | Red Lobster Racing (USA) | David Cowart | March | 82G | | Porsche | GTP |
| 26 | Nehl / Silcox / Moise | Centurion Leasing (USA) | | Chevrolet | Camaro | III | Chevrolet | GTO |
| 27 | Fowells / Mummery / Potter | Scuderia Rosso (USA) | Jim Fowells | Mazda | RX-7 | | Mazda | GTU |
| 28 | "Fomfor" / Kreysa / *Naon | Air Florida (ES) | "Fomfor" | BMW | M1 | | BMW | GTO |
| 29 | Overby / Bell / Doyle | Overby's | | Chevrolet | Camaro | | Chevrolet | GTO |
| 30 | Case / Case / Pannacione | Case Racing | | Porsche | 911 | | Porsche | GTU |
| 31 | Griffin / *Zouzelka | Pegasus Racing | | Porsche | 914 | /4 | VW | GTU |
| 33 | Keck / McDill / Whitaker | Karl Keck (USA) | Karl Keck | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 34 | Drolsom / Cohen / Gelles | Drolsom Racing (USA) | George Drolsom | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 35 | Leon / Gilgan / Pickering | Pegasus Racing | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 36 | Miller / Busby / Grable | Herman + Miller P+A (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 37 | Welter / Burdsall / Northam | Burdsall/Welter | | Mazda | RX-7 | | Mazda | GTU |
| 38 | Mandeville / Johnson / Smith | Mandeville Auto/Tech (USA) | Roger Mandeville | Mazda | RX-7 | | Mazda | GTU |
| 39 | Gunn / Londono | Holly Racing (USA) | | Phoenix | JG1 | | Chevrolet | GTP |
| 40 | Bieri / *Gysler / *Hubbard | Bieri Racing (CDN) | | BMW | M1 | | BMW | GTO |
| 42 | Wonzer / Bean / Cason | Gary Wonzer (USA) | Gary Wonzer | Porsche | 911 | S | Porsche | GTU |
| 44 | Tullius / Adam / *Bedard | Group 44 (USA) | | Jaguar | XJR-5 | | Jaguar | GTP |
| 47 | Whittington / *Romero / *Bundy | Pepe Romero (USA) | | March | 83G | | Chevrolet | GTP |
| 49 | Overbagh / Kirill / Romano | OMR Engines (USA) | | Chevrolet | Monza | | Chevrolet | GTO |
| 50 | Fonseca / Ferrer / *Febles | Latino Racing (CR) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 51 | Carmean / Herman | Red Roof Inns (USA) | Jim Trueman | Mazda | RX-7 | | Mazda | GTU |
| 52 | Gauthier / Cripe / Collins / McVey | TFC Racing | | Porsche | 911 | | Porsche | GTU |
| 53 | Garcia / Matienzo | Superior Racing Team (USA) | Raul Garcia | Chevrolet | Camaro | II | Chevrolet | GTO |
| 54 | Fernandez / Vilarchao | Daniel Vilarchao (USA) | Daniel Vilarchao | Chevrolet | Camaro | III | Chevrolet | GTO |
| 57 | Heinz / Thompson / Gentilozzi | Dave Heinz Racing (USA) | | Chevrolet | Camaro | III | Chevrolet | GTO |
| 58 | Gregg / Rude / Henn | Brumos Racing (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 60 | Cook / Dietrich / Bacon | Team Morrison | Tommy Morrison | Mazda | RX-7 | | Mazda | GTU |
| 61 | Courtney / Sereix / O'Neill | Vista Racing (USA) | | Chevrolet | Monza | | Chevrolet | GTO |
| 62 | Nelson / *Kreider / *Vosta | Bill Nelson | | Pontiac | Firebird | | Pontiac | GTO |
| 63 | Downing / Maffucci / Ulinski | RGP 500 Racing (USA) | Jim Downing | Mazda | RX-7 | | Mazda | GTU |
| 64 | Opie / Morgan / Bradley | Marcus Opie | | Chevrolet | Corvette | | Chevrolet | GTO |
| 65 | Gordillo / Villa / Soldevilla | Manuel Villa | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 66 | Dunham / Kline / Compton | Mike Meyer Racing (USA) | Mike Meyer | Mazda | RX-7 | | Mazda | GTU |
| 68 | Rynerson / McDonald / Wilder | Jack Rynerson | Jack Rynerson | Porsche | 911 | S | Porsche | GTU |
| 69 | Gonzalez / Cruz | Hiram Cruz Racing (PR) | Armando Gonzalez | Porsche | 934 | | Porsche | GTO |
| 74 | Taylor / *Figaro | Mark Wagoner (USA) | | Chevron | GTP | | Buick | GTP |
| 75 | Worth / Crouch / Taylor | Bryant & Graham Racing | | Ford | Pinto | | Ford | GTU |
| 76 | Lee / White / Ayes | Hi Fi Hospital | | Ford | Capri | | Ford | GTU |
| 77 | Honegger / Bohren | Z & W Enterprises (USA) | | Mazda | GTP | | Mazda | GTP |
| 78 | Bitterauf / Smith / Flanders | Der Klaus Haus | | Porsche | 911 | | Porsche | GTU |
| 79 | Winters / Bergstrom / Dawe | Whitehall/Promotion (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 80 | Arutunoff / Marina | Hallet Motor Racing Circuit (USA) | Anatoly Arutunoff | Lancia | Stratos | HF | Ferrari | GTU |
| 82 | Varde / Baldwin / Casey | Trinity Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 83 | Brezinka / Bartling / Schramm | R & H Racing (CDN) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 86 | Haywood / Holbert / *Leven | Bayside Disposal Racing (USA) | Bruce Leven | Porsche | 935 | /80 | Porsche | GTP |
| 87 | Gottfried / Turner / Flores | Don Flores (USA) | | Porsche | 911 | | Porsche | GTU |
| 89 | "Jamsal" / Barrientos / Galdamez | Taca El Salvador (ES) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 90 | Schaefer / Zitza / Refenning | 901 Shop (USA) | | Porsche | 911 | SC | Porsche | GTU |
| 91 | Bryant / Priest / Guido | Bryant & Graham Racing | | BMW | 2002 | | BMW | GTU |
| 92 | Mueller / Visger | Kent Racing (USA) | David Kent | Mazda | RX-7 | | Mazda | GTU |
| 93 | Higgins / King / Mead | Foreign Exchange (USA) | | Porsche | 911 | | Porsche | GTU |
| 94 | Whittington / Whittington | Henn's Swap Shop Racing (USA) | Preston Henn | Porsche | 935 | K3/80 | Porsche | GTP |
| 95 | Skiff / Leo | Ned Skiff | | Renault | 12 | | Renault | GTU |
| 96 | Byrd / Baker / Kirby | Weld Fixturing (USA) | Philip Byrd | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 99 | Londono / Munoz / Gralia | Londono Bridge Racing (CO) | | Porsche | 911 Carrera | RSR | Porsche | GTO |