(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 0 | Chevrolet Camaro | Warren Agor Racing Enterprises, Inc. | orange | | | | closed | front |
| 1 | Mirage M6 Ford | Gulf Research Racing Co. | light blue (+orange) | Gulf | Firestone | Gulf | open | mid |
| 2 | Mirage M6 Ford | Gulf Research Racing Co. | light blue (+orange) | Gulf | Firestone | Gulf | open | mid |
| 3 | Ford Capri RS 2600 | Ausca, Inc. | dark green/yellow/red/blue | | Goodyear | Union 76 | closed | front |
| 5 | Ford Capri RS 2600 | Herb Wetanson Racing | white (+purple) | ROMAN BRIO/GENESIS MAGAZINE | Goodyear | | closed | front |
| 6 | Porsche 911 Carrera RSR | Roger Penske Enterprises | dark blue (+yellow) | SUNOCO | Goodyear | Sunoco | closed | rear |
| 7 | Ferrari 365 GTB/4 | Modern Classic Motors - Ferrari | yellow | | | | closed | front |
| 8 | Ferrari 365 GTB/4 | North American Racing Team | red | | | | closed | front |
| 9 | Ferrari 365 GTB/4 | Robert Grossman | red | | | | closed | front |
| 10 | Ferrari 312 PB | Ferrari SEFAC SPA | red (+yellow) | HEUER/GOODYEAR | Goodyear | Shell | open | mid |
| 11 | Ferrari 312 PB | Ferrari SEFAC SPA | red (+dark green) | HEUER/GOODYEAR | Goodyear | Shell | open | mid |
| 12 | Ferrari 312 PB | Ferrari SEFAC SPA | red (+blue) | HEUER/GOODYEAR | Goodyear | Shell | open | mid |
| 14 | Porsche Carrera RSR | Holbert's Porsche-Audi | blue (+yellow) | | | | closed | rear |
| 16 | Porsche 911 Carrera RSR | Toad Hall Motor Racing | yellow | Ethyl/Toad Hall Motor Racing | Goodyear | Castrol | closed | rear |
| 23 | Ferrari 365 GTB/4 | Diagnosis and Service Racing | yellow/red (+white) | | | | closed | front |
| 25 | Alfa Romeo Montreal | Bobcor Performance Racing Corp. | orange (+blue) | BOBCOR | | Kendall | closed | front |
| 26 | Chevrolet Corvette | Fred Kepler Enterprises | burgundy/silver | | | | - | front |
| 31 | Porsche 911 S | Jim Locke | | | | | closed | rear |
| 32 | Matra-Simca MS670B | Equipe Matra | blue (+white) | Shell/MATRA 670 B | Goodyear | Shell | open | mid |
| 33 | Matra-Simca MS670B | Equipe Matra | blue (+green/white) | Shell/MATRA 670 | Goodyear | Shell | open | mid |
| 36 | Chevrolet Camaro | Miller Brothers Racing Enterprises | white/red | | | | closed | front |
| 37 | Chevrolet Corvette | Miller Brothers Racing Enterprises | white/red | | | | - | front |
| 41 | Chevrolet Corvette | Rodney Harris | white | | | | - | front |
| 43 | Porsche 911 Carrera RS | Ecurie Escargot | light blue | | | | closed | rear |
| 48 | Chevrolet Corvette | John Greenwood Racing | black/red/blue | | | | - | front |
| 59 | Porsche Carrera RSR | Brumos Porsche-Audi Corp. | white (+red/blue) | GARRARD | Goodyear | | closed | rear |
| 63 | Chevrolet Corvette | Michael Oleyar | white/blue/red | LITTLE FOREIGN CAR SHOP RACING/KENDALL GT-1 RACING OIL | | | hardtop | front |
| 64 | Chevrolet Corvette | Weaver Chevrolet | | | | | - | front |
| 65 | Porsche 911 Carrera RSR 2.8 | Gregg Loomis | white | | | | closed | rear |
| 70 | Porsche Carrera RSR | Bob Harmon Racing | white/red | | | | closed | rear |
| 73 | March 73S BMW | STP March Racing Team | red (+dark blue/silver/white) | STP/GOODYEAR | Goodyear | STP | open | mid |
| 76 | Porsche Carrera RS | Silverstone Enterprises | white | | | | closed | rear |
| 81 | Porsche 911 Carrera RSR 2.8 | Pharr West Racing | yellow (+dark blue) | PHARR YARNS | Goodyear | | closed | rear |
| 87 | Ferrari Dino 246 GT | Centrum International Corp. | silver/white | | | | - | - |
| 88 | Chevrolet Camaro | Carter Racing Services | red (+white) | | | | closed | front |
| 91 | Chevron B23 Ford | Professional Racing Associates | yellow (+black) | MRE | Firestone | | open | mid |
| 92 | Porsche 911 S | Holbert's Porsche-Audi | blue (+white) | | | | closed | rear |
| 94 | Chevrolet Corvette | Leidon Blackwell Racing | red (+yellow) | | | | hardtop | front |
| 97 | Porsche 911 | Hans Niederer | beige | | | | closed | rear |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 4 | Chevrolet Camaro | C. C. Canada Lumber Co., Inc. | silver | | | | closed | front |
| 22 | Lola T282 Ford | Equipe Gitanes Cigarettes de France | blue | | | | open | mid |
| 24 | Porsche 908/03 | Joest-Racing | light blue (+orange/dark blue) | | | | open | mid |
| 31 | De Tomaso Pantera | Tope Racing Enterprises | red/white/blue | | | | closed | mid |
| 47 | Chevrolet Corvette | Performance Associates | | | | | - | front |
| 51 | Porsche 911 S | Johnson-Bozzani Porsche-Audi | orange | | | | closed | rear |
| 58 | Porsche 911 Carrera RSR | Brumos Porsche-Audi Corp. | white/red | | | | closed | rear |
| 69 | Chevrolet Corvette | Goldleaf Racing, Inc. | silver/blue | | | | - | front |
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