| 0 | Field / *Ongais / *Whittington | Interscope Racing (USA) | Ted Field | Porsche | 935 | K3/80 | Porsche | GTP |
| 00 | Whittington / Field | Interscope Racing (USA) | Ted Field | Porsche | 935 | K3/80 | Porsche | GTP |
| 01 | Morton / Klausler | Marketing Corp. of America (USA) | | Ford | Mustang | | Ford | GTO |
| 02 | Bauer / Pratt / Minter | Marketing Corp. of America | | Ford | Mustang | | Ford | GTO |
| 03 | Pallavicini / Crang / Sheldon | Pallavicini Racing (CH) | | Porsche | 934 | | Porsche | GTO |
| 04 | Morejon / Almeida / Soto | T & R Racing (USA) | Tico Almeida/Rene Rodriguez | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 05 | Soto / Rodriguez / Almeida | T & R Racing (USA) | Tico Almeida/Rene Rodriguez | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 06 | Kerry Hitt | Advanced Composites (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 07 | Heimrath, Jr. / Heimrath | Heimrath Racing (CDN) | Ludwig Heimrath | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 08 | Howes / Nacthwey / Jones | Portia Parlor (USA) | | Porsche | 911 | SC | Porsche | GTU |
| 09 | Henn / Wilson / Hinze | Thunderbird Swap Shop (USA) | Preston Henn | Porsche | 935 | K3/80 | Porsche | GTP |
| 2 | Fitzpatrick / *Hobbs / *Baker | John Fitzpatrick Racing (GB) | John Fitzpatrick | Porsche | 935 | K3/80 | Porsche | GTP |
| 3 | Sullivan / Belcher / Phipps | Belcher Racing | | Rondeau | M382 | | Ford | GTP |
| 4 | Raub / Leitzinger / Pasmas | Oftedahl Racing (USA) | Gordon Oftedahl | Pontiac | Firebird | | Pontiac | GTO |
| 5 | Akin / Siebert / Bell | Bob Akin Motor Racing (USA) | Bob Akin | Porsche | 935 | K3/80 | Porsche | GTP |
| 6 | Wollek / Dören / Lanier | N.A.R.T. (USA) | | Ferrari | 512 BB | /LM | Ferrari | GTP |
| 7 | Kent-Cooke / Wietzes / Adams | Cooke Racing (USA) | Ralph Kent-Cooke | Lola | T600 | | Chevrolet | GTP |
| 8 | Paul / *Paul, Jr. / *Stommelen | JLP Racing (USA) | John Paul | Porsche | 935 | JLP-2 | Porsche | GTP |
| 9 | Rahal / Canepa / Trueman | Garretson Ent. (USA) | Bob Garretson | March | 82G | | Chevrolet | GTP |
| 10 | Shafer / Mooney / Brassfield | Oftedahl Racing (USA) | Gordon Oftedahl | Chevrolet | Camaro | II | Chevrolet | GTP |
| 11 | Aase / *Kendall / *Hotchkis | Kendall Racing (USA) | Charles Kendall | BMW | M1 | | BMW | GTO |
| 13 | Arutunoff / Marina | Hallet Motor Racing Circuit (USA) | Anatoly Arutunoff | Lancia | Stratos | HF | Ferrari | GTU |
| 15 | Panaccione / Mead / Graham | D. L. Performance (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | GTO |
| 16 | Fitzpatrick / Boggs / Renfrow | Steve Fitzpatrick | | Ford | Mustang | | Ford | GTO |
| 17 | Bighouse / Dingman | Dingman Racing (USA) | Dingman Brothers | Chevrolet | Corvette | | Chevrolet | GTO |
| 18 | Paul, Jr. / Stommelen / Paul | JLP Racing (USA) | John Paul | Porsche | 935 | JLP-3 | Porsche | GTP |
| 19 | Van Every / Tisdelle | Van Every Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 20 | Hunter / Turner / Eitel | AutoWest (USA) | | Mercury | Capri | | Ford | GTO |
| 21 | Crevier / Stiff / Wilson / *Northam | Crevier & Associates (USA) | | BMW | M1 | | BMW | GTO |
| 23 | Davenport / Carney / McComb | Raytown Datsun/D. Preston (USA) | Frank Carney | Datsun | 280ZX | | Datsun | GTU |
| 24 | Refenning / Tilton / Bond | 901 Shop (USA) | Jack Refenning | Porsche | 934 | | Porsche | GTO |
| 25 | Cowart / Miller / *Mendez | Red Lobster Racing (USA) | David Cowart | March | 82G | | BMW | GTP |
| 26 | Nehl / Riggins / Silcox | Auriga Racing (USA) | | Chevrolet | Camaro | II | Chevrolet | GTP |
| 27 | Fowells / Mummery / Carusso | Scuderia Rosso (USA) | Jim Fowells | Mazda | RX-7 | | Mazda | GTU |
| 28 | Stiff / Morgan | Morgan Performance Group (USA) | Charles Morgan | Datsun | 280ZX | | Datsun | GTU |
| 29 | Heinz / Kirill / Overbagh | Oberdorfer Research (USA) | | Chevrolet | Monza | | Chevrolet | GTO |
| 30 | Long / Case / Case | Case Racing | | Porsche | 911 | | Porsche | GTU |
| 33 | Bacon / Ashford / Humphreys | Al Bacon (USA) | | Porsche | 911 Carrera | | Porsche | GTO |
| 34 | Drolsom / Johnson / Frank | Drolsom Racing (USA) | George Drolsom | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 35 | Speer / Ratcliff / Wolters | W-S Ent. (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 36 | Miller / Bedard / Barth | Herman + Miller P+A | | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 37 | Neland / Kuhel / Northam / *Cotrone | Kend Co. Ent. (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 38 | Mandeville / Johnson / Kline | Mandeville Racing Ent. (USA) | Roger Mandeville | Mazda | RX-7 | | Mazda | GTU |
| 39 | Kump / Worthington / Hollar | Motion Plus (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 40 | Bartling / Deacon / Freberg | Deacon Racing (CDN) | | BMW | M1 | | BMW | GTO |
| 41 | Schmidt / Schmidt / Hitt | Starved Rock Ledge (USA) | | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 42 | Wonzer / Bean / Grantham | Gary Wonzer (USA) | Gary Wonzer | Porsche | 911 | S | Porsche | GTU |
| 43 | Young / Gregg / McIntyre | Bob Gregg Racing (USA) | Bob Gregg | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 44 | Hagan / Labonte / Felton | Stratagraph (USA) | Billy Hagan | Chevrolet | Camaro | III | Chevrolet | GTP |
| 46 | DeNarvaez / Garretson / Wood | Garretson Ent. (USA) | Bob Garretson | Porsche | 935 | K3/80 | Porsche | GTP |
| 47 | de Dryver / *Davis | Tide Racing (USA) | | Ferrari | 512 BB | /LM | Ferrari | GTP |
| 49 | Jolly / Copeman / Marx | Copeman Racing (USA) | Bob Copeman | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 50 | Febles / Ferrer / Soldevilla | Diego Febles Racing (PR) | Diego Febles | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 51 | Juckette / Meldeau / McDill / *Shafer | Meldeau Tire World | | Chevrolet | Camaro | | Chevrolet | GTP |
| 52 | Swanson / *Snow / *Cripe | Ours & Hours Racing | | Porsche | 911 | | Porsche | GTU |
| 53 | "Fomfor" / Valiente / Kreysa | Nemtex (ES) | | BMW | 3.0 CSL | | BMW | GTO |
| 54 | Garcia / Naon / McFarlin | Montura Racing (USA) | | BMW | M1 | | BMW | GTO |
| 57 | Carmean / O'Steen / Pimm | Red Roof Inn | | Mazda | RX-7 | | Mazda | GTU |
| 58 | Bundy / Busby / Schurti | Brumos Racing (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 60 | Church / Marx / *Lee | Bob's Speed Products | | AMC | AMX | | | GTO |
| 62 | Koll / Hoerr / McKitterick | Golden Eagle Racing (USA) | Bill Koll | Rondeau | M382 | | Ford | GTP |
| 63 | Waugh / Downing / Maffucci | Downing/Atlanta (USA) | Jim Downing | Mazda | RX-7 | | Mazda | GTU |
| 64 | Canada / Cochran / Franklin | Canada Racing (USA) | C. C. Canada | Chevrolet | Camaro | I | Chevrolet | GTO |
| 65 | Knoop / Baird / Pumpelly | Prancing Horse Farm Racing (USA) | Ron Spangler | Ferrari | 512 BB | /LM | Ferrari | GTP |
| 66 | Dunham / Smith, Jr. / Smith | Dunham Trucking (USA) | Jack Dunham | Mazda | RX-7 | | Mazda | GTU |
| 67 | Delano / Petery / Nightingale | Levi's Team Highball | | AMC | Spirit | AMX | AMC | GTO |
| 70 | Chmura / Schofield / Regan | Genesis Racing (USA) | Larry Chmura | Chevron | GTP | | Mazda | GTP |
| 71 | Goodell / Johnson | Maverick Racing | | Porsche | 935 | | Porsche | GTP |
| 72 | Kjoller / Nikel / Clay | Carrera Motorsports | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 73 | Howey / Koch / Wolf | Wolf Engine (USA) | | Chevrolet | Camaro | II | Chevrolet | GTO |
| 74 | Taylor / Arego / Dassinger | Mark Wagoner (USA) | | Chevron | GTP | | Buick | GTP |
| 75 | Kreider / Swope / Knab | Performance Plus Products (USA) | Dale Kreider | Chevrolet | Corvette | C3 | Chevrolet | GTO |
| 77 | Katayama / Yorino / Terada | Mazda of North America | | Mazda | RX-7 | | Mazda | GTO |
| 78 | Flanders / Bitterauf / Smith | Der Klaus Haus | | Porsche | 911 | | Porsche | GTU |
| 79 | Bergstrom / *Winters / *Overby | Promo. Ltd./Whitehall Cap. (USA) | | Porsche | 924 | Carrera GTR | Porsche | GTO |
| 80 | Mears / Emanuelson / Adams | Herb Adams (USA) | Herb Adams | Pontiac | Firebird | | Pontiac | GTO |
| 81 | Dietrich / Blackaller / Qvale | Trinity Racing (GB) | | Mazda | RX-7 | | Mazda | GTU |
| 82 | Cook / Casey | Trinity Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 83 | Zitza / Belperche / Zitza | Zotz Garage (USA) | | Porsche | 914 | /6 | Porsche | GTU |
| 84 | "Jamsal" / Barrientos / Galdamez | Scorpio Racing (ES) | | Porsche | 934 | | Porsche | GTO |
| 86 | Haywood / Leven / Holbert | Bayside Disposal Racing (USA) | Bruce Leven | Porsche | 935 | /80 | Porsche | GTP |
| 87 | Ramirez / Cook / Cooper | R. Sanchez Racing | | Mazda | RX-7 | | Mazda | GTU |
| 88 | Beasley / Stone / Lewis | Bob Beasley (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTO |
| 89 | English / Thompson / *Price | Herb Adams (USA) | Herb Adams | Chevrolet | Camaro | | Chevrolet | GTO |
| 92 | Mullen / Bohren / Grable | Kent Racing (USA) | David Kent | Mazda | RX-7 | | Mazda | GTU |
| 93 | Bieri / Stevens / Bye | Uli Bieri | | Porsche | 911 | | Porsche | GTU |
| 97 | Cummings / Justis | Cummings Marque | | Chevrolet | Monza | | Chevrolet | GTP |
| 98 | Rude / Mueller / Moffat | Kent Racing (USA) | David Kent | Mazda | RX-7 | | Mazda | GTU |
| 99 | Cogbill / Lanier / Gassaway | Key Mud Co. | | Chevrolet | Camaro | | Chevrolet | GTO |
| 444 | Tullius / Adam / Smiley | Group 44 (USA) | | Jaguar | XJS | | Jaguar | GTP |