(Car Appearance)
| No. | Car | Entrant | Colour | Tyres | Body | Engine |
| 1 | LeGrand Mk.4 Ford | Dan Blocker Racing Ent. | | Goodyear | - | - |
| 2 | Lotus 23 Alfa Romeo | Auto-Mech. | | | open | mid |
| 7 | Porsche 906 E | Porsche of America Corp. | light | Goodyear | closed | mid |
| 9 | Elva Mk VIII Alfa Romeo | Charles A. Kulmann | | Firestone | open | mid |
| 15 | Elva - Porsche | Edward I. Bowman, Jr. | | Firestone | open | mid |
| 17 | Porsche Spyder | Harry Weber Motors | | Goodyear | - | mid |
| 21 | Brabham BT5 BMW | Ron Hunter | | | open | mid |
| 22 | Porsche 906 | Quaker State | | Goodyear | closed | mid |
| 33 | Porsche 906 | Otto Zipper | dark | Goodyear | closed | mid |
| 35 | LeGrand Mk.4B Climax | Sports/Racing Pacific | | | - | - |
| 41 | Lotus 23 Ford | Dio Bros. | | Firestone | open | mid |
| 46 | Lotus 23 Porsche | John Morton | | Firestone | open | mid |
| 57 | Porsche 906 | Monte R. Shelton | blue | Firestone | closed | mid |
| 58 | Porsche 906 | Jacques Duval | | Goodyear | closed | mid |
| 66 | Lotus 23B Fairchild | George Follmer Enterprises | | Goodyear | open | mid |
| 68 | Lotus 23B Ford | Society of DOM | | Goodyear | open | mid |
| 77 | Porsche 906 | Erwin C. Uihlein, Jr. | | | closed | mid |
| 98 | Lotus 23G Ford | Ernie Gravelle | | Firestone | open | mid |
| Lotus 23 Ford | | | Firestone | open | mid |
| Lotus - Climax | | | | - | - |
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