(Car Appearance)
| No. | Car | Entrant | Sponsors | Tyres | Lubricant | Body | Engine |
| 7 | Porsche 906 | Porsche of America, Corp. | PORSCHE | Goodyear | Valvoline | closed | mid |
| 15 | Lotus 23 C | | | | | open | mid |
| 22 | Porsche 906 | | | | | closed | mid |
| 42 | Lotus Elan | | | | | open | front |
| 45 | Porsche 718 RS 61 | | | | | open | mid |
| 49 | Elva Mk VIII | | | | | open | mid |
| 57 | Elva - BMW | | | | | open | mid |
| 58 | Porsche 906 | | FRAM | | | closed | mid |
| 77 | Porsche 906 | | | Goodyear | STP | closed | mid |
| 85 | Lotus 47 | | | | | closed | mid |
| 247 | Porsche 906 Spyder | | | | | open | mid |
| Bobsy - Porsche | | | | | - | - |
| Lotus | | | | | open | mid |
| Elva - Porsche | | | | | - | - |
| Kelly Special Porsche | | | | | open | mid |
| Elva - BMW | | | | | open | mid |
| Lotus 23B | | | | | open | mid |
| Brabham BT8 | | | | | - | mid |
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