| 0 | Field / Ongais | Interscope Racing (USA) | Ted Field | Porsche | 935 | /79 | Porsche | Gr.5 | +2000 |
| 00 | Ongais / Field | Interscope Racing (USA) | Ted Field | Porsche | 935 | /77A | Porsche | Gr.5 | +2000 |
| 09 | Mears / *Henn / *Gregg | Bayside Disposal Racing (USA) | Preston Henn | Porsche | 935 | /77A | Porsche | Gr.5 | +2000 |
| 3 | Busby / Winkelhock / *Hobbs | BMW of North America and Munich (USA) | Jim Busby | BMW | M1 | | BMW | Special | |
| 5 | Miller / Cowart | K.W.M. Racing (USA) | Kenper Miller | BMW | 3.5 CSL | | BMW | Gr.5 | TA-II/+2000 |
| 6 | Mendez / Miller | CMR Inc. (USA) | Charles Mendez | Porsche | 935 | | Porsche | Gr.5 | +2000 |
| 7 | Heimrath / Moran | Heimrath Racing (CDN) | Ludwig Heimrath | Porsche | 935 | | Porsche | Gr.5 | TA-II/+2000 |
| 10 | Huber / Muniz / Muniz | Oftedahl Racing (USA) | Gordon Oftedahl | Chevrolet | Camaro | II | Chevrolet | - | TA-I |
| 11 | Muniz / *Shafer | Oftedahl Racing (USA) | Gordon Oftedahl | Chevrolet | Camaro | II | Chevrolet | - | TA-I |
| 13 | Shaw, Jr. / Belcher | Hal Shaw Racing (USA) | Hal Shaw | Porsche | 935 | | Porsche | - | TA-II |
| 15 | Mancuso / *Kicak | Motion Merchants (USA) | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 16 | Kassel / Roberts | Tom's Mechanical Emporium/Kassel Auto Parts (USA) | | Chevrolet | Camaro | | Chevrolet | - | TA-I |
| 18 | Paul / Holbert | J.L.P. Racing, Inc. (USA) | John Paul | Porsche | 935 | JLP-1 | Porsche | - | TA-II |
| 19 | Cord / *Adams | Chris Cord Racing (USA) | | Chevrolet | Monza | | Chevrolet | - | TA-II |
| 20 | Forbes-Robinson / Townsend / Lunger | Andial Porsche Service (USA) | Randolph Townsend | Porsche | 935 | | Porsche | Gr.5 | +2000 |
| 21 | Wood / Gomez / Shafer | Oftedahl Racing (USA) | Gordon Oftedahl | Chevrolet | Camaro | II | Chevrolet | - | TA-I |
| 23 | Zulkowski / Storc | Metal Craft Racing (USA) | | Porsche | 914 | /6 | Porsche | - | TA-I |
| 25 | Maier / Siri, Jr. / Hinchliff | Maier Racing, Inc. (USA) | William Maier | Ford | Mustang | Boss 302 | Ford | - | TA-I |
| 29 | Overbagh / Hagan | Stratagraph, Inc. (USA) | | Chevrolet | Monza | | Chevrolet | - | TA-I |
| 30 | Fryer / Lowther | University of Pittsburgh Auto Racing Team (USA) | | AMC | Javelin | | AMC | - | TA-I |
| 37 | Schulte / Cleveland | Kassel Auto Parts (USA) | | Chevrolet | Corvette Sting Ray | C2 | Chevrolet | - | TA-I |
| 38 | Fernandez / Ferrer | Boricua Motors Corp. (PR) | | Porsche | 911 Carrera | RSR | Porsche | - | TA-II |
| 42 | Minter / Scott | Bill Scott Racing Development (USA) | Bill Scott | VW | Rabbit | | VW | T | -2000 |
| 43 | Joyce / Frank | Phantom Racing (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 44 | Tullius / Fuerstenau | JRT/Quaker State (USA) | | Triumph | TR8 | | Rover | GT | TA-I/+2000 |
| 47 | McKnight / Lutz | Doug Lutz (USA) | | Porsche | 911 Carrera | RSR 3.0 | Porsche | - | TA-II |
| 51 | Aquilante / *Wolpert / *White | Thomas Aquilante (USA) | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 52 | Schuler / Schuler | Fred Schuler, Inc. (USA) | | Datsun | 280Z | | Datsun | - | TA-I |
| 55 | Howes / Sturtevant | Intrepid Design Inc. (USA) | | Porsche | 911 Carrera | | Porsche | - | TA-II |
| 57 | Shelton / Shelton | Monte's Motor Co. (USA) | | Porsche | 935 | | Porsche | - | TA-II |
| 61 | Cosentino / Fisher | Faza Squadra (USA) | Alfred Cosentino | Mazda | RX-3 | | Mazda | T | -2000 |
| 64 | Baechle / *Carter | Endurance Racing Enterprises (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 65 | Salerno / *Lapane | Alan F. Salerno (USA) | | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 66 | Thomas / Ridgely / Kirby | Stanton/Barbour (USA) | Dick Barbour | Porsche | 935 | | Porsche | - | TA-II |
| 70 | Stommelen / Barbour / Newman | Dick Barbour Performance (USA) | Dick Barbour | Porsche | 935 | | Porsche | Gr.5 | +2000 |
| 71 | McFarlin / Woods / Akin | Dick Barbour Performance (USA) | Dick Barbour | Porsche | 935 | | Porsche | - | TA-II |
| 72 | McKitterick / Marcus / Garretson | Dick Barbour Performance (USA) | | Porsche | 935 | | Porsche | - | TA-II |
| 77 | Jennings / Beasley / Bean | Bruce Jennings (USA) | Bruce Jennings | Porsche | 911 | S | Porsche | - | TA-I |
| 80 | Carter / DeLorenzo | Maurice C. Carter (USA) | | Chevrolet | Camaro | II | Chevrolet | - | TA-II |
| 85 | Gregg / Haywood / Leven | Bayside Disposal Racing (USA) | Bruce Leven | Porsche | 935 | | Porsche | - | TA-II |
| 90 | Rynone / Wiernicki / Wiernicki | Rynone Industries (USA) | Tom Rynone | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 91 | Werl / Spencer / Vecchi | HDJ (USA) | | Ford | Mustang | | Ford | - | TA-I |
| 92 | Feinstein / Oleyar / Engels | E. F. Miller & Co./Wayne County Auto (USA) | | Chevrolet | Corvette | C3 | Chevrolet | - | TA-I |
| 93 | Oleyar / *Engels | E. F. Miller & Co./Little Foreign Car Shop (USA) | E. F. Miller | Chevrolet | Corvette | | Chevrolet | - | TA-I |
| 94 | Whittington / Ludwig / Whittington | Whittington Bros/Kremer Racing (USA) | Whittington Brothers | Porsche | 935 | /77A | Porsche | Gr.5 | +2000 |
| 95 | Whittington / Redman / Rutherford | Whittington Brothers (USA) | | Porsche | 935 | /79 | Porsche | - | TA-II |
| 97 | Schramm / Frank | Framm Promotions (USA) | | Porsche | 911 Carrera | RSR | Porsche | - | TA-II |
| 98 | Green / Bauer | Larry Green/Bauer Racing (USA) | Larry Green | Porsche | 911 Carrera | RSR | Porsche | - | TA-I |