(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 0 | Porsche 917 PA | Vasek Polak Racing, Inc. | white/blue | PORSCHE/Castrol | Goodyear | Castrol | open | mid |
| 1 | Lola T260 Chevrolet | Carl A. Haas Racing Teams Ltd. | white (+red/black/silver) | L&M | Goodyear | Castrol | open | mid |
| 3 | McLaren M8E Chevrolet | Bob Brown Racing, Inc. | dark green | | | | open | mid |
| 5 | McLaren M8F Chevrolet | McLaren Cars Ltd. | orange (+dark blue) | Gulf/REYNOLDS ALUMINIUM/McLAREN CARS | Goodyear | Gulf | open | mid |
| 7 | McLaren M8F Chevrolet | McLaren Cars Ltd. | orange (+dark blue) | Gulf/REYNOLDS ALUMINIUM/McLAREN CARS | Goodyear | Gulf | open | mid |
| 9 | Lola T160/3 Chevrolet | Overhauser Racing Ltd. | red | WORLD | | Valvoline | open | mid |
| 11 | McLaren M8D Chevrolet | Motschenbacher Racing Enterprises | red (+dark blue) | Paul Newman | Goodyear | Valvoline | open | mid |
| 12 | McLaren M8E/D Chevrolet | Motschenbacher Racing Enterprises | red | | | | open | mid |
| 13 | Lola T160 Chevrolet | Place Motor Supply | yellow | | | | open | mid |
| 20 | Porsche 917/10 | Jo Siffert Automobiles Racing | red | STP/PORSCHE AUDI/Marlboro | Goodyear | Valvoline | open | mid |
| 27 | McLaren M6B Ford | Midwest Racing | red/blue | | | | open | mid |
| 29 | McLaren M8E Chevrolet | American Racing Associates | yellow | ARA | Goodyear | Pennzoil | open | mid |
| 34 | McLaren M8C Chevrolet | Warren Burmester | white | | Goodyear | Valvoline | open | mid |
| 41 | Lola T163 Chevrolet | Jim Butcher | green | | | Valvoline | open | mid |
| 47 | March 707 Chevrolet | JND Racing | red (+silver) | STP | Goodyear | Valvoline | open | mid |
| 48 | Ferrari 512 M | Herbert Mueller Racing | red | HERBERT MÜLLER RACING | | Valvoline | closed | mid |
| 51 | Lola T222 Chevrolet | Dave Causey | blue (+silver) | KENDALL GT-1 RACING OIL | Goodyear | Kendall | open | mid |
| 54 | McLaren M8B Chevrolet | Auto World, Inc. | orange/white/black | auto world EQUIPMENT/Jerubee | | | open | mid |
| 55 | McLaren M8E Chevrolet | McCaig Racing | orange | | | | open | mid |
| 66 | McLaren M12 Chevrolet | Stan's Werkstatt | blue | | | | open | mid |
| 79 | McLaren M6B Chevrolet | Barrett Racing, Inc. | yellow | | | | open | mid |
| 81 | Lola T163 Chevrolet | Racing Associates, Inc. | orange/white | | | | open | mid |
| 87 | Porsche 908/02 | A. G. Dean | blue | | | | open | mid |
| 88 | Lola T222 Chevrolet | Kazato Racing Ltd., c/o Carl A. Haas Automobile Imports, Inc. | red | JEOL/HIROSHI KAZATO | Goodyear | Valvoline | open | mid |
| 91 | Lola T70 Mk.3 Chevrolet | R. S. Racing Ent. | yellow | STP | | Valvoline | open | mid |
| 101 | Shadow Mk II Chevrolet | Advanced Vehicle Systems | white/grey (+black) | uop/SHADOW | Goodyear | Valvoline | open | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 8 | McLaren M8D Chevrolet | Delta Tire Co. Agapiou Bros. Racing | blue | | | | open | mid |
| 16 | McLaren Elva Mark II B Chevrolet | R. Brezinka | red | | | | - | - |
| 18 | McLaren M12 Chevrolet | Vic Franzese, Glen Racing, Ltd. | gold/green | | | | open | mid |
| 25 | McKee-Hodges Mk.2 LSR Chevrolet | Hodges Racing Team | blue | | | | open | mid |
| 35 | Lola T160 Chevrolet | Hird Enterprises | yellow (+blue) | | | | open | mid |
| 37 | McLaren M6B Chevrolet | Cliff Apel Racing | red | | | | open | mid |
| 42 | Lola T160 Chevrolet | Otto A. Decker, Grand Prix Racing and Dev. Ltd. | blue/silver | | Goodyear | | open | mid |
| 51 | Lola T222 Chevrolet | Dave Causey | white/red | KENDALL GT-1 RACING OIL | | Kendall | open | mid |
| 74 | McLaren Elva Mark II B Chevrolet | Donald L. Plekenpol | | | | | - | - |
| 75 | Lola T70 Mk.3 Chevrolet | Mark S. Broin | blue/gold | | | | open | mid |
| 76 | Ferrari 512 Can-Am | Ferrari West, Inc. | red | | | | - | mid |
| 77 | McLaren Elva Mark III Chevrolet | Bob Klempel | white | | | | open | mid |
| 89 | McLaren M8E Chevrolet | Fred Parkhill | white/blue | | | | open | mid |
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