(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 4 | Enduro Special Climax | W. F. Goodrum | white | | | | open | mid |
| 7 | Porsche 906 | Porsche of America | white (+dark green) | ROBERT BOSCH/PORSCHE AMERICA | | STP | closed | mid |
| 17 | Porsche 718 RS 61 | Harry Webster Motors | purple/white | HARRY WEBER MOTORS | | | open | mid |
| 18 | QAE Monoprix Ford | Q. A. Engineering | light blue | F. C. C. Racing Team/STP | Goodyear | STP | open | mid |
| 22 | Porsche 906 | Fred Baker | green (+white) | Quaker State Special | Goodyear | STP | closed | mid |
| 33 | Porsche 906 | Otto Zipper | dark blue | ROBERT BOSCH SPECIAL | Goodyear | STP | closed | mid |
| 46? | Lotus 23 Porsche | John Morton | | | | | open | mid |
| 57 | Porsche 906 | Monte Shelton | blue | | Firestone | Valvoline | closed | mid |
| 77 | Porsche 906 | E. C. Uihlein, Jr. | white (+blue) | STP | Goodyear | STP | closed | mid |
| 98 | Lotus 23G Ford | Ernie Gravelle | | | | | open | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 8 | LeGrand - Alfa Romeo | Ken Hazlett | | | | | - | - |
| 15 | Elva - Porsche | Edward Bowman | | | | | open | mid |
| 26 | Gardner 65E S/R Volvo | Doug Auston | | | | | - | - |
| 35 | LeGrand - Climax | Sports/Racing Pacific | | | | | - | - |
| 64 | Ginetta - Cosworth | Team Scarti | | | | | - | mid |
| 68 | Lotus 23B Ford | S. O. D. O. M. | | | | | open | mid |
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