| 0 | Jelinski / Ballot-Léna / Ricci | Joest Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 02 | Johnstone / Everett / Nelson | Taymay Inc. | Frank E. Everett | Spice | SE86CL | | Pontiac | Lights |
| 03 | Kendall / Jones / McCall / Baldwin | Skoal Bandit Racing | | Chevrolet | Camaro | III | Chevrolet | GTO |
| 04 | Auberlen / Auberlen / Eisenlohr / Shelton | SP Racing (USA) | Gary Auberlen | Porsche | 911 Carrera | | Porsche | GTU |
| 05 | Ferrer / Falgueras / Villa / Gonzalez | Diman Racing | | Royale | RP40 | | Porsche | Lights |
| 07 | Riggins / Varde / Showket / *Earwood | Full Time Racing | Joe Varde | Dodge | Daytona | | Dodge | GTU |
| 09 | Durst / Cochran / Brockman / Belcher / *Abel | Ball Bros. Racing (USA) | | Spice | SE88P | | Buick | GTP |
| 3 | Larrauri / Stuck / Brun / *Bundy | Brun Motorsports/Kalagian Racing (CH) | Walter Brun | Porsche | 962 | C | Porsche | GTP |
| 4 | Ludemann / Schubot / Williams | Buick/Quaker State (USA) | | Spice | SE88P | | Buick | Lights |
| 5 | Frey / Roth / Naon, Jr. / *St. James | Tom Milner Racing | | Ford | Mustang Probe | | Ford | GTP |
| 6 | Pumpelly / Melgrati / Baldwin / *Loring | Tom Milner Racing (USA) | | Ford | Mustang Probe | | Ford | GTP |
| 7 | St. James / Loring / Roth | Tom Milner Racing (USA) | | Ford | Mustang Probe | | Ford | GTP |
| 8 | McAdam / Adam / Mead / *Pastorini | Fabcar American Racing (USA) | | Fabcar | GTP | | Chevrolet | GTP |
| 9 | Morgan / Morrison / Hessert | Essex Racing (USA) | | Tiga | GT288 | | Buick | Lights |
| 10 | Hotchkis / Adams / Hotchkis, Jr. | Hotchkis Racing (USA) | John Hotchkis | Porsche | 962 | | Porsche | GTP |
| 11 | Dallenbach, Jr. / Schroeder / Martin | Stroh's Light Cougar (USA) | Jack Roush | Mercury | Cougar | VII XR-7 | Ford | GTO |
| 12 | Bupp / Peters / *Taylor / *Montgomery / *Goral / *Groggins | Del Russo Taylor (USA) | | Pontiac | Firebird | | Pontiac | GTO |
| 16 | Halsmer / Earl / Martin / Stewart | Stroh's Light Cougar (USA) | Jack Roush | Mercury | Cougar | VII XR-7 | Ford | GTO |
| 17 | Bacon / Reed / Millen | Al Bacon Performance (USA) | Al Bacon | Mazda | RX-7 | | Mazda | GTU |
| 20 | Phillips / McKay / *Pobst | Kennedy Groves | | Tiga | GT285 | | Mazda | Lights |
| 26 | Cowart / Brayton / Meyer / Fowells | MSB Racing (USA) | | Argo | JM19 | | Mazda | Lights |
| 27 | Pruett / Clinton / Lindley / *Gentilozzi | Rocketsports (USA) | Paul Gentilozzi | Oldsmobile | Cutlass | | Chevrolet | GTO |
| 28 | Adamowicz / Rocca / Lopez / Lopez | Far Western Bank Canada Shoes (USA) | Carlos Bobeda | Tiga | GT286 | | Mazda | Lights |
| 29 | Kimbrough / Kahn / Overbagh / *Siegal / *Peters | Overbagh Motor Racing (USA) | Hoyt Overbagh | Chevrolet | Camaro | III | Chevrolet | GTO |
| 30 | Sigala / Baldi / Moretti / *Dickens | Torno-Momo (D) | Moretti/Gebhardt | Porsche | 962 | C | Porsche | GTP |
| 31 | Akers / Painter / Puleo / Donner / *Montgomery | A & R Auto Electric (USA) | Anthony Puleo | Chevrolet | Camaro | III | Chevrolet | GTO |
| 32 | Moore / Baljet / McDonald | Oftedahl Racing | | Buick | Somerset | | Buick | GTO |
| 33 | Los / Kline / Quester | Old Spice Pontiac (GB) | | Spice | SE88P | | Pontiac | GTP |
| 35 | Rubright / Libert / Upton | Budweiser Racing | Craig A. Rubright | Chevrolet | Camaro | | Chevrolet | GTO |
| 36 | Grooms / Fergus / Jellinek / *Monk | Erie Scientific | | Argo | JM16 | | Mazda | Lights |
| 38 | Mandeville / Marsh / Redman / *Drummond | Mandeville Auto Tech (USA) | Roger Mandeville | Mazda | RX-7 | | Mazda | GTO |
| 40 | Finotto / Guatamacchi / Bieri | Bieri Racing (CDN) | Uli Bieri | Tiga | GT286 | | Ferrari | Lights |
| 43 | Higgins / Lamas / Lazier / Reid | Motorsports Marketing | John Higgins | Fabcar | CL | | Porsche | Lights |
| 46 | Urrutia / Whipp / Smith / Swanson | Gultwind Marine | Daniel Urrutia | Chevrolet | Camaro | | Chevrolet | GTO |
| 47 | Burt / Northam / Wallace | Chaunce Wallace | Chaunce Wallace | Chevrolet | Camaro | | Chevrolet | GTO |
| 51 | Boxstrom / Kreider / Porcaro / Hurley / *Newsome | Caribbean Sol (USA) | Dale Kreider | Buick | Somerset | | Buick | GTO |
| 53 | McDill / Whitaker / McDill | Chateau Souverain | Bill McDill | Chevrolet | Camaro | | Chevrolet | GTO |
| 55 | Marvin / Freed / Allison / Liebler | Huffaker Racing (USA) | | Spice | SE86CL | | Pontiac | Lights |
| 57 | Kryder / Polony / Goodwin / Shafer | Kryderacing (USA) | | Nissan | 300ZX | | Nissan | GTU |
| 58 | Bean / Dow / Wonzer / *Pace / *Reed / *Westcott | Gary Wonzer Racing (USA) | Gary Wonzer | Lola | T616 | | Mazda | Lights |
| 60 | Lammers / Jones / Boesel | Castrol Jaguar Racing (GB) | | Jaguar | XJR-9 | D | Jaguar | GTP |
| 61 | Cobb / Nielsen / Wallace / Lammers | Castrol Jaguar Racing (GB) | | Jaguar | XJR-9 | D | Jaguar | GTP |
| 62 | Wolters / Kraft / Bond / Job | Alex Job (USA) | | Porsche | 911 | | Porsche | GTU |
| 63 | Katz / Downing / O'Steen / Maffucci / *Nickerson | Mazda (USA) | | Argo | JM19 | | Mazda | Lights |
| 64 | Jourdain / Manautou / Berg / Contreras | Bernard Jourdain | | Porsche | 962 | | Porsche | GTP |
| 66 | Daly / *Donnelly / *Tambay | Castrol Jaguar Racing (GB) | | Jaguar | XJR-9 | D | Jaguar | GTP |
| 67 | Wollek / Bell / Andretti | Miller High Life/BF Goodrich 962 (USA) | Jim Busby | Porsche | 962 | | Porsche | GTP |
| 68 | Andretti / Andretti | Busby Racing (USA) | | Porsche | 962 | | Porsche | GTP |
| 71 | Johnson / Shaw / Lazier / *Robson | Team Highball (USA) | Amos Johnson | Mazda | RX-7 | | Mazda | GTU |
| 72 | Kjoller / *Mooney / *Boone / *Dotson | Jay Kjoller (USA) | Jay Kjoller | Porsche | 911 | | Porsche | GTU |
| 74 | Robinson / Kendall / Unser | Huffaker Racing | | Pontiac | Fiero | | Pontiac | GTU |
| 75 | Schmidt / Brayton / Schmidt / Engelhardt | Jack Engelhardt | | Badger | BB | | Mazda | Lights |
| 77 | Katayama / Yorino / Forbes-Robinson | Mazda Motors of America (J) | | Mazda | 767 | B | Mazda | GTP |
| 79 | Rothbarth / Ciasulli / Miller / Felton | Whitehall Motorsports (USA) | | Spice | SE87L | | Pontiac | Lights |
| 82 | Greer / Mees / Finger | Aspen Inn (USA) | Dick Greer | Mazda | RX-7 | | Mazda | GTU |
| 83 | Luyendyk / Robinson / Brabham / Roe | Electramotive Engineering (USA) | | Nissan | GTP ZX-T | | Nissan | GTP |
| 84 | Roe / *Brabham / *Robinson / *Luyendyk | Electramotive Engineering (USA) | | Nissan | GTP ZX-T | | Nissan | GTP |
| 85 | Leven / Dyson / Dobson / Paul, Jr. | Texaco Havoline Star Bayside Motorsports (USA) | | Porsche | 962 | | Porsche | GTP |
| 86 | Ludwig / Weaver / van der Merwe | Texaco Havoline Star Bayside Motorsports (USA) | | Porsche | 962 | | Porsche | GTP |
| 87 | Stewart / Cortez / Alkazian / Fillip / *Overton | Overton Autosport | | Mazda | RX-7 | | Mazda | GTU |
| 88 | Phillips / Johnson / Lesnett | Transact, Inc. | Jeffrey von Braun | Argo | JM19 | B | Ferrari | Lights |
| 89 | Refenning / Scott / Baker / Uria | 901 Racing (USA) | | Porsche | 911 Carrera | RSR | Porsche | GTU |
| 90 | Petery / Delano / Carter | Road Circuit Technology | | Mercury | Capri | | Ford | GTO |
| 91 | LaCroix / Seabroke / Smith / Johnson | G.T. Motorsport | | Tiga | GT285 | | Mazda | Lights |
| 92 | Zeeb / Purner / Akin | Motorcraft (USA) | Jack Roush | Mercury | Capri | | Ford | GTO |
| 94 | Burgner / Bupp / Brosnaham / Peters / Montgomery / *Valentine | Spirit of Brandon (USA) | Ken Bupp | Chevrolet | Camaro | | Chevrolet | GTO |
| 95 | Leitzinger / Kurtz / Leitzinger | Fastcolor Images (USA) | | Nissan | 240SX | | Nissan | GTU |
| 96 | Reisman / *Hebert / *Gaffney / *Mills | Paul Reisman | Paul Reisman | Chevrolet | Camaro | | Chevrolet | GTO |
| 98 | Olson / Cord / Bren | All American Racers (USA) | | Toyota | 88C | | Toyota | GTP |