(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 | | open | mid |
| 3 | Porsche 917/10 | Vasek Polak Racing, Inc. | white (+blue) | PORSCHE AUDI/VASEK POLAK | Goodyear | Castrol | open | mid |
| 4 | Porsche 917/10 TC | Hans Wiedmer | orange/blue | | Goodyear | | open | mid |
| 6 | Porsche 917/30 TC | Penske-Roger Enterprises, Inc. | dark blue/yellow (+red/silver) | SUNOCO/PORSCHE+AUDI | Goodyear | Sunoco | open | mid |
| 8 | McLaren M8F Chevrolet | U.S. Racing | blue | | | | open | mid |
| 9 | McLaren M8D Chevrolet | William Overhauser Racing | yellow | WORLD | | | open | mid |
| 11 | McLaren M8D Chevrolet | Motschenbacher Racing | | | | | open | mid |
| 13 | McLaren M8FP Chevrolet | Warren Agor Racing Ent. | white (+orange) | | Goodyear | | open | mid |
| 14 | Lola T260 Chevrolet | Racing Specialties | purple (+gold/silver) | ROMAN BRIO | | | open | mid |
| 16 | Porsche 917/10 TC | Rinzler Motoracing/Royal Crown | white (+blue/red) | RC | Goodyear | | open | mid |
| 17 | Lola T260 Chevrolet | Nagel Racing | blue (+silver) | World Airways | | | open | mid |
| 18 | Lola T222 Chevrolet | Bailey Speed Shop | | | | | open | mid |
| 34 | McLaren M8R Chevrolet | Burmester Racing | white (+red/blue) | Burmeister | | | open | mid |
| 41 | McLaren M8C Chevrolet | Jim Butcher Racing | | | | | open | mid |
| 47 | McLaren M8E Chevrolet | Blue Magic Corp. | blue/red/white | | | Valvoline | open | mid |
| 51 | McLaren M8F Chevrolet | Dave Causey | red/white | | | | open | mid |
| 59 | Porsche 917/10 TC | Brumos Racing | white (+red/blue) | KENDALL GT-1 | | Kendall | open | mid |
| 73 | McLaren M20 Chevrolet | Roy Woods Racing | black (+red) | CARLING Black Label BEER | Goodyear | Castrol | open | mid |
| 96 | McLaren M20 Chevrolet Turbo | Commander Motor Homes | | CORBET | | | open | mid |
| 97 | McLaren M8F Chevrolet | Commander Motor Homes | | | | | open | mid |
| 98 | McLaren M8F Chevrolet | Commander Motor Homes | white | | | | open | mid |
| 101 | Shadow DN2 Chevrolet | Don Nichols | black | uop/SHADOW | Goodyear | UOP | open | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 15 | McLaren M8C Chevrolet | | | | | | open | mid |
| 23 | Porsche 917/10 TC | Rinzler Motoracing/Royal Crown | white (+blue/red) | RC | Goodyear | | open | mid |
| 45 | Costello SP7 Oldsmobile | Ennerdale Racing | | | | | open | mid |
| 64 | McLaren M8C Chevrolet | Bob Peckham | | | | | open | mid |
| 81 | Lola T163 Chevrolet | Dick Durant | red/white | DURANT Racing | Goodyear | Shell/Valvoline | open | mid |
| Lola T163 | | | | | | open | mid |
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