(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Lubricant | Body | Engine |
| 0 | Porsche 917/10 TC | Vasek Polak Racing, Inc. | | | | open | mid |
| 1 | Lola T310 Chevrolet | Carl A. Haas Racing Teams, Ltd. | | STEED | | open | mid |
| 2 | McLaren M8F Chevrolet | Young American Racing | | | | open | mid |
| 4 | McLaren M20 Chevrolet | McLaren Cars/Boyd Jefferies | | | | open | mid |
| 5 | McLaren M20 Chevrolet | McLaren Cars/Boyd Jefferies | | | | open | mid |
| 6 | Porsche 917/10 TC | Roger Penske Enterprises, Inc. | white/red (+black/silver) | L&M/PORSCHE+AUDI | | open | mid |
| 7 | Porsche 917/10 TC | Roger Penske Enterprises, Inc. | | L&M/PORSCHE+AUDI | | open | mid |
| 8 | McLaren M8F Chevrolet | | | | | open | mid |
| 9 | McLaren M8D Chevrolet | William Overhauser Racing | | | | open | mid |
| 11 | McLaren M8D Chevrolet | Motschenbacher Racing Enterprises | | | | open | mid |
| 12 | McLaren M8F Chevrolet | Motschenbacher Racing | | | | open | mid |
| 17 | Lola T222 Chevrolet | Nagel Racing | | | | open | mid |
| 19 | McLaren M8E Chevrolet | Gary Wilson Racing | | | | open | mid |
| 22 | McLaren M8F Chevrolet | Young American Racing | | | | open | mid |
| 23 | Lola T222 Chevrolet | Rinzler Motor Racing - Holiday Inns, Inc. | | Holiday Inns | | open | mid |
| 28 | McLaren M8E Chevrolet | Jerry Rosbach | | | | open | mid |
| 30 | McLaren M12 Chevrolet | Midwest Racing | | | | open | mid |
| 31 | McLaren M8B Chevrolet | Warren Agor | | | | open | mid |
| 34 | McLaren M8C Chevrolet | Warren Burmester | white (+red) | | STP | open | mid |
| 35 | Lola T160 Chevrolet | Commander Racing Team, Inc. | | | | open | mid |
| 37 | McLaren M8F Chevrolet | Warren Agor | | Auto World/Hoselton | | open | mid |
| 41 | Lola T163 Chevrolet | Jim Butcher Racing | | | | open | mid |
| 44 | Lola T260 Chevrolet | Jerry Hansen | | | | open | mid |
| 47 | McLaren M8E Chevrolet | Blue Magic Corp. | | | | open | mid |
| 50 | McLaren M8C/D Chevrolet | J.N.O. Racing | | | | open | mid |
| 51 | McLaren M12 Chevrolet | Pete Sherman | | | | open | mid |
| 59 | Porsche 917/10 TC | Brumos Porsche-Audi | | KENDALL GT-1 | Kendall | open | mid |
| 61 | Lola T260 Chevrolet | Racing Specialties | | ROMAN BRIO | | open | mid |
| 91 | McLaren M6B Chevrolet | R-S Racing Ent. | | | | open | mid |
| 96 | McLaren M8E/D Chevrolet | The March Company | | | | open | mid |
| 99 | McLaren M12 Chevrolet | O.T. Racing | | | | - | mid |
| 101 | Shadow Mk III Chevrolet | Don Nichols | | uop | UOP | open | mid |
| 102 | Shadow Mk III Chevrolet | Don Nichols | | uop | UOP | open | mid |
| Lola T70 Mk.3 Chevrolet | Greg Granum | | | | open | mid |
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