(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 0 | Porsche 917/10 TC | Vasek Polak Racing, Inc. | white (+blue) | PORSCHE AUDI/VASEK POLAK | Goodyear | Castrol | open | mid |
| 2 | McLaren M8E Chevrolet Turbo | Lee Jeans Racing Team | blue | RIDER/LEE JEANS | Goodyear | | open | mid |
| 3 | Porsche 917/10 TC | Vasek Polak Racing, Inc. | white (+blue) | PORSCHE AUDI/VASEK POLAK | Goodyear | Castrol | open | mid |
| 6 | Porsche 917/30 TC | Roger Penske Ent., Inc. | dark blue/yellow (+red/silver) | SUNOCO/PORSCHE+AUDI | Goodyear | Sunoco | open | mid |
| 7 | Porsche 917/30 TC | Roger Penske Ent., Inc. | dark blue/yellow (+red/silver) | SUNOCO/PORSCHE+AUDI | Goodyear | Sunoco | open | mid |
| 8 | McLaren M8F Chevrolet | U.S. Racing | blue | GOODYEAR | Goodyear | | open | mid |
| 9 | McLaren M8D Chevrolet | Overhauser Racing, Ltd. | yellow | WORLD | | Valvoline | open | mid |
| 11 | McLaren M8F Chevrolet | Motschenbacher Racing, Ltd. | red (+silver) | Castrol | Goodyear | Castrol | open | mid |
| 13 | Ferrari 512 M | Artemis International, Ltd. | red (+blue/silver) | MODENA Sports cars | | | closed | mid |
| 16 | Porsche 917/10 TC | Rinzler Motoracing | white (+blue/red) | RC | Goodyear | Valvoline | open | mid |
| 17 | Lola T260 Chevrolet | Nagel Racing | blue (+silver) | World Airways/THERMO KING | Goodyear | Valvoline | open | mid |
| 20 | KMW SP20 Porsche | Muller Motors Corp. | blue | KMW | | Castrol | open | mid |
| 22 | KMW SP20 Porsche | Muller Motors Corp. | blue | | | | open | mid |
| 23 | Porsche 917/10 TC | Rinzler Motoracing | white (+blue/red) | RC | Goodyear | Valvoline | open | mid |
| 30 | McLaren M8F Chevrolet | Midwest Racing | red | QUAKER STATE | | | open | mid |
| 33 | Alfa Romeo T33/3 | Otto Zipper Racing Team | red (+white) | OTTO ZIPPER ALFA | | Union 76 | open | mid |
| 34 | McLaren M8R Chevrolet | Burmester Racing | white (+red/blue) | Burmeister | | Valvoline | open | mid |
| 39 | Lola T260 Chevrolet | Racing Specialties | purple (+gold/silver) | | | | open | mid |
| 45 | Costello SP8 Oldsmobile | Ennerdale Racing | | COSTELLO | | | open | mid |
| 59 | Porsche 917/10 TC | Brumos Racing | white (+red/blue) | KENDALL GT-1/BRUMOS | Goodyear | Kendall | open | mid |
| 64 | McLaren M8C Chevrolet | Peckham Engineering | red (+black) | | | | open | mid |
| 73 | McLaren M20 Chevrolet | Roy Woods Racing, Inc. | black (+red) | CARLING Black Label BEER | Goodyear | Castrol | open | mid |
| 77 | Lola T163 Chevrolet | Charles P. Semple | blue | | | | open | mid |
| 96 | McLaren M20 Chevrolet Turbo | Slater Racing | white (+black/brown) | | Goodyear | Castrol | open | mid |
| 97 | McLaren M8F Chevrolet | Slater Racing | white (+brown/orange) | COMMANDER | Goodyear | Castrol | open | mid |
| 98 | McLaren M8F Chevrolet | Slater Racing | white (+brown/orange) | | | | open | mid |
| 101 | Shadow DN2 Chevrolet | Universal Oil Products | black | uop/SHADOW | Goodyear | UOP | open | mid |
| 102 | Shadow DN2 Chevrolet Turbo | Universal Oil Products | black | uop | Goodyear | UOP | open | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 45 | Costello SP7 Oldsmobile | Ennerdale Racing | blue (+gold/white) | | | | open | mid |
| 47 | McLaren M8E Chevrolet | Blue Magic Corporation | blue/red/white | | | | open | mid |
| 55 | McLaren M12 Ford Turbo | M & R Racing, Inc. | white | Seagull Wiley | | | open | mid |
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