(Car Appearance)
| No. | Car | Entrant | Sponsors | Body | Engine |
| 0 | Porsche 917 PA | Vasek Polak Racing | | open | mid |
| 1 | Lola T260 Chevrolet | Carl Haas Racing | L&M | open | mid |
| 3 | McLaren M8E Chevrolet | Bob Brown Racing | | open | mid |
| 5 | McLaren M8F Chevrolet | McLaren Cars Ltd. | | open | mid |
| 7 | McLaren M8F Chevrolet | McLaren Cars Ltd. | | open | mid |
| 11 | McLaren M8D Chevrolet | Motschenbacher Racing | | open | mid |
| 12 | McLaren M8E/D Chevrolet | Motschenbacher Racing | | open | mid |
| 17 | Lola T222 Chevrolet | Dave Causey | | open | mid |
| 18 | McLaren M12 Chevrolet | Great Western (Champagne) | | open | mid |
| 20 | Porsche 917/10 | Jo Siffert | STP/PORSCHE AUDI | open | mid |
| 29 | McLaren M8E Chevrolet | American Racing Associates | ARA | open | mid |
| 34 | McLaren M8C Chevrolet | Warren Burmester | | open | mid |
| 37? | McLaren M6B Chevrolet | Cliff Apel | | open | mid |
| 41 | Lola T163 Chevrolet | Jim Butcher | | open | mid |
| 44 | Lola T220 Chevrolet | Jerry Hansen | | open | mid |
| 48 | Ferrari 512 M | Mueller Racing | | - | mid |
| 55 | McLaren M8E Chevrolet | McCaig Racing | | open | mid |
| 66 | McLaren M12 Chevrolet | Stan's Werkstatt | | open | mid |
| 79 | McLaren M6B Chevrolet | Barrett Racing | | open | mid |
| 87 | Porsche 908/02 | A. G. Dean | | open | mid |
| 88 | Lola T222 Chevrolet | Carl Haas Racing | | open | mid |
| 89 | McLaren M8E Chevrolet | Fred Parkhill | | open | mid |
| 101 | Shadow Mk II Chevrolet | Advanced Vehicle Systems | uop/SHADOW | open | mid |
| Lola T70 Mk.3 Chevrolet | Mark Broin Racing | | open | mid |
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