(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Body | Engine |
| 1 | Shadow DN4 Chevrolet | Phoenix Racing Organizations, Inc. | | UOP | open | mid |
| 3 | McLaren M8F Chevrolet | Bill Cuddy | | | open | mid |
| 5 | McLaren M8R Chevrolet | Burmester Racing | | | open | mid |
| 6 | McLaren M8F Chevrolet | Performance Engineering Ltd. | | | open | mid |
| 7 | Ferrari 512 M Spyder | Herbert Mueller Racing/Formula Racing | | | - | mid |
| 8 | McLaren M20 Chevrolet | Herb Caplan - U.S. Racing | | | open | mid |
| 9 | McLaren M8D Chevrolet | William Overhauser Racing Ltd. | | | open | mid |
| 10 | Lola T163 Chevrolet | Bill Morrow | | | open | mid |
| 11 | McLaren M8F Chevrolet | Motschenbacher Racing Ent. | | | open | mid |
| 12 | McLaren M8E Chevrolet | Page Racing | | | open | mid |
| 14 | McLaren M8C Chevrolet | Jerry L. Mull | | | open | mid |
| 16 | Porsche 908/02 | Dennis Aase | | | open | mid |
| 17 | Lola T260 Chevrolet | Nagel Racing | | World Airways | open | mid |
| 39 | Lola T260 Chevrolet | Racing Specialties | | | open | mid |
| 41 | McLaren M8C Chevrolet | Jim Butcher Racing | | | open | mid |
| 45 | Costello SP8 Oldsmobile | Ennerdale Racing | | | open | mid |
| 55 | McLaren M12 Ford Turbo | Wes McNay | | | open | mid |
| 75 | McLaren M8C Chevrolet | Janke Auto Co. | | | open | mid |
| 77 | Lola T163 Chevrolet | Bob Klempel | | | open | mid |
| 101 | Shadow DN4 Chevrolet | Phoenix Racing Organizations, Inc. | | uop | open | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Body | Engine |
| 13 | McLaren M8F Chevrolet | Warren Agor Racing | white (+orange) | | open | mid |
| 18 | Lola T222 Chevrolet | Bailey Speed Shop | | | open | mid |
| 30 | Lola T310 Chevrolet | Sieg Glage | | | open | mid |
| 51 | McLaren M8F Chevrolet | Pete Sherman Racing | red/white | | open | mid |
| 98 | McLaren M8FP Chevrolet | Lodestar Enterprises | white/red/blue | LODESTAR | open | mid |
| 139 | Porsche 908/02 Flunder | R. Brezinka | white/red/blue | | open | mid |
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