(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 1 | Caldwell D7B Chevrolet | Autodynamics Corp. | white (+red) | | Goodyear | Valvoline | open | mid |
| 3 | Lola T70 Mk.2 Chevrolet | George L. Ralph, Jr. | dark blue | | Firestone | | open | mid |
| 6 | McLaren M6A Chevrolet | Roger Penske Racing | dark blue | SUNOCO SPECIAL | Goodyear | Sunoco | open | mid |
| 8 | McLaren Elva Mark III Chevrolet | Ronald K. Courtney | blue | | | | open | mid |
| 10 | Lola T70 Mk.3 Chevrolet | Carl A. Haas Racing Teams | orange (+blue) | | | | open | mid |
| 11 | McLaren M6B Ford | Motschenbacher Racing Ent. | red | | | | open | mid |
| 15 | Chinook Mk.1 Chevrolet | | | | | | - | - |
| 18 | Lotus 23 | James Place | red | | | | open | mid |
| 22 | Elva Mk VIII BMW | Richard J. Jacobs | gold/black | | | | open | mid |
| 23 | Lola T70 Mk.2 | George Walther, Jr. | dark blue | | | | - | - |
| 24 | McKee Mk.7 Ford | R. J. Nagel | white | | | | open | mid |
| 26 | Lola T70 Mk.3 Chevrolet | Carl A. Haas Racing Teams | orange (+blue) | SIMONIZ Special | Goodyear | | open | mid |
| 34 | Chinook Mk II Chevrolet | Max Beimler | silver (+red) | | | | open | mid |
| 36 | Chinook - Chevrolet | Nat Adams | blue | NAT ADAMS | | | open | mid |
| 37 | Kelly Special Porsche | Altona Motors | green | | | | open | mid |
| 39 | McLaren - Chevrolet | Heimrath Racing | yellow | | | | open | mid |
| 42 | McLaren Elva Mark III Chevrolet | Land & Cattle, Inc. | bronze | | | | open | mid |
| 43 | Lola T70 Mk.3 Chevrolet | Rich Galloway | bronze | | | | open | mid |
| 57 | McLaren Elva Mark III Chevrolet | Performance Engineering Ltd. | green | | | | open | mid |
| 62 | McLaren Elva Mark III Chevrolet | | | | | | open | mid |
| 68 | Special Ford | | | | | | - | - |
| 88 | Porsche 906 | Foreign Car Sales | orange | | | | closed | mid |
| 96 | McLaren Elva Mark II Chevrolet | Jean-Paul Ostiguy | white | | | | open | mid |
| 98 | McLaren Elva Mark III Ford | George Eaton Racing | | | | | open | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 5 | Lola T70 Chevrolet | Team Shorall Motor Racing | red | | | | open | mid |
| 69 | Brahma II | John Sharrigan | red | | | | - | - |
| 74 | Piranha | Charles R. Sarle | light yellow | | | | - | - |
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