(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 1 | Porsche 917 K | J. W. Automotive Engineering | light blue (+orange) | Gulf | Firestone | Gulf | closed | mid |
| 2 | Porsche 917 K | J. W. Automotive Engineering | light blue (+orange) | Gulf | Firestone | Gulf | closed | mid |
| 5 | Porsche 914/6 | Jacques Duval | | | | | - | mid |
| 6 | Ferrari 512 M | Roger Penske/Kirk F. White | blue (+yellow) | SUNOCO/Ferrari | Goodyear | Sunoco | closed | mid |
| 12 | Porsche 914/6 | Ralph Meaney | | | | | - | mid |
| 14 | Ferrari 512 M | North American Racing Team | red | SILICONES | Goodyear | Shell | closed | mid |
| 16 | Porsche 911 T | Toad Hall Racing | yellow/black | | | | closed | rear |
| 21 | Ferrari 512 M | Young American Racing Team | | | | | closed | mid |
| 30 | Alfa Romeo T33/3 | Autodelta S.p.A. | red (+white) | Firestone/Shell/Alfa Romeo | Firestone | Shell | open | mid |
| 31 | Porsche 911 T | Locke Development Corporation | red | PORSCHE-AUDI | | | closed | rear |
| 32 | Porsche 911 S | Locke Development Corporation | | | | | closed | rear |
| 33 | Alfa Romeo T33/3 | Autodelta S.p.A. | | | | | open | mid |
| 35 | Alfa Romeo T33/TT/3 | Autodelta S.p.A. | | | | | open | mid |
| 36 | Alfa Romeo T33/3 | Autodelta S.p.A. | red (+white) | Shell | | Shell | open | mid |
| 37 | Porsche 911 | Holbert/Oest | | | | | closed | rear |
| 40 | Ferrari 312 PB | S.p.A. Ferrari SEFAC | red | Shell/HEUER | Firestone | Shell | open | mid |
| 41 | Chevrolet Corvette | Iroquois Racing Associates | | | | | - | front |
| 43 | Porsche 917 K | David Piper Racing | dark green (+orange) | SANDEMAN | Goodyear | | closed | mid |
| 46 | Porsche 906 K | Brokers Racing/Nationwide Food | white/blue | | | | closed | mid |
| 48 | Ferrari 512 M | Herbert Müller Racing | red | rolanaflor | | Shell | closed | mid |
| 49 | Chevrolet Corvette | John Greenwood Racing | white (+blue/red) | MARATHON | | | hardtop | front |
| 50 | Chevrolet Corvette | John Greenwood Racing | | | | | - | front |
| 57 | Chevrolet Corvette | Or Costanzo/Tri City Corvette Club | | | | | hardtop | front |
| 59 | Porsche 914/6 | Brumos Porsche-Audi | red (+black) | PORSCHE AUDI | | Kendall | hardtop | mid |
| 60 | Lola T70 Mk.3B GT Chevrolet | Bahamas Racing | | | | | closed | mid |
| 61 | Lola T212 Ford | Promotional Advertising | yellow | SAVIN | | Valvoline | open | mid |
| 63 | Ferrari 512 M | Ecurie Francorchamps | yellow | Shell/STP | | Shell | closed | mid |
| 64 | Chevrolet Corvette | Bob Baechle | | | | | - | front |
| 67 | Lola T212 Ford | Baker Motor Co. | orange | | | | open | mid |
| 68 | Porsche 911 S | Baker Motor Co. | red | | | | closed | rear |
| 70 | Porsche 911 | Kremer Racing | | | | | closed | rear |
| 80 | Porsche 911 | Fritz Hochreuter | | | | | - | rear |
| 87 | Porsche 908/02 | A. G. Dean (Racing) | | | | | open | mid |
| 91 | Chevrolet Corvette | Robert Luebbe | | | | | - | front |
| T | Porsche 917 K | J. W. Automotive Engineering | light blue (+orange) | Gulf | Firestone | Gulf | closed | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 3 | Lola T212 Ford | Scuderia Filipinetti | | | | | open | mid |
| 10 | Porsche 914/6 | Ralph Meaney | | | | | - | mid |
| 11 | Porsche 914/6 | Ralph Meaney | | | | | - | mid |
| 13 | Porsche 911 S | Jim Glanton | | | | | - | rear |
| 18 | Chevrolet Corvette | Es-Pa Racing | | | | | - | front |
| 22 | Chevron B8 BMW | Don A. Baumgartner | | | | | closed | mid |
| 45 | Porsche 908/02 | Guillermo Ortega | | | | | open | mid |
| 53 | Lola T212 Ford | Georges Dumoing | | | | | open | mid |
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