| 1 | Chevrolet Corvette | Troy Promotions, Inc. | white (+red) | | | | closed | front |
| 2 | Chevrolet Corvette | Troy Promotions, Inc. | white (+red) | | | | closed | front |
| 3 | Chevrolet Corvette | Robert D. Esseks | maroon | | | | - | front |
| 4 | Chevrolet Corvette | Or Costanzo | yellow | | | | hardtop | front |
| 5 | Chevrolet Camaro Z/28 | Best Photo Service | red | BEST PHOTO SERVICE/YENKO | Goodyear | Gulf | closed | front |
| 6 | Ford Mustang | Herbert R. Madray | red/white | | | | - | front |
| 7 | Ford Mustang | Argento Racing Organization | maroon | | | | closed | front |
| 8 | Pontiac Firebird | Fred Van Beuren | white | | | | closed | front |
| 9 | Lola T70 Mk.3B GT Chevrolet | Roger Penske Racing Enterprises | dark blue (+yellow) | SUNOCO | Goodyear | Sunoco | closed | mid |
| 10 | Lola T70 Mk.3 GT Chevrolet | American International Racing, Inc. | dark blue | AIR | Goodyear | Shell | closed | mid |
| 11 | Lola T70 Mk.3 GT Chevrolet | American International Racing, Inc. | blue | AIR | Goodyear | | closed | mid |
| 14 | Lola T70 Mk.3B GT Chevrolet | Sportscars Switzerland | white (+red/blue) | VALVOLINE | Goodyear | Valvoline | closed | mid |
| 16 | Chevrolet Camaro | Richard Stevens | blue | | | | closed | front |
| 17 | Chevrolet Camaro I | Bruce Behrens Racing Enterprises | red | Gulf | Goodyear | Gulf | closed | front |
| 18 | Chevrolet Camaro | Wilton T. Jowett, Srov. | red | Gulf/VALVOLINE | Goodyear | Valvoline | closed | front |
| 19 | Chevrolet Camaro | Maurice Carter Chevrolet | red/white | carter CHEVROLET | Firestone | Valvoline | closed | front |
| 20 | Chevrolet Camaro | David H. McClain | blue/white | | | | closed | front |
| 21 | Chevrolet Camaro | Larry Drover, (Laural Racing) | yellow | HERGEN CARS INC | Goodyear | Valvoline/Gulf | closed | front |
| 22 | Ford GT40 | J. W. Automotive Engineering Ltd. | light blue (+orange) | Gulf | Firestone | Gulf | closed | mid |
| 23 | Ford GT40 | J. W. Automotive Engineering Ltd. | light blue (+orange) | Gulf | Firestone | Gulf | closed | mid |
| 24 | Ford GT40 | Auto Enterprizes | dark blue | Gulf | Goodyear | Valvoline | closed | mid |
| 25 | Ferrari 312 P | Ferrari S.P.A. SEFAC | red | Firestone/SHELL | Firestone | Shell | open | mid |
| 26 | Ferrari 250 P | N.A.R.T. | red | | | | open | mid |
| 27 | Porsche 908/02 | Porsche System Engineering Ltd. | white (+yellow) | Shell/CIBIÉ/PORSCHE | Dunlop | Shell | open | mid |
| 28 | Porsche 908/02 | Porsche System Engineering Ltd. | white | CIBIÉ/PORSCHE | Dunlop | | open | mid |
| 29 | Porsche 908/02 | Porsche System Engineering Ltd. | white (+red) | Shell/CIBIÉ/PORSCHE | Dunlop | Shell | open | mid |
| 30 | Porsche 908/02 | Porsche System Engineering Ltd. | white (+blue) | Shell/CIBIÉ/PORSCHE | Dunlop | Shell | open | mid |
| 31 | Porsche 908/02 | Porsche System Engineering Ltd. | white (+green) | Shell/CIBIÉ/PORSCHE | Dunlop | Shell | open | mid |
| 31T | Porsche 908/02 | Porsche System Engineering | white | Shell/PORSCHE | Dunlop | Shell | open | mid |
| 32 | Alfa Romeo T33/3 | Autodelta, S.P.A. | red (+yellow) | | Dunlop | | open | mid |
| 33 | Alfa Romeo T33/3 | Autodelta, S.P.A. | red (+white) | BOSCH | Dunlop | | open | mid |
| 34 | Alfa Romeo T33/3 | Autodelta, S.P.A. | red | BOSCH | Dunlop | | open | mid |
| 35 | MGC GT | British Leyland Motor Corporation | dark green | CHAMPION | | Castrol | closed | front |
| 36 | MGC | British Leyland Motor Corporation | dark green (+red) | BRITISH LEYLAND | | Castrol | closed | front |
| 37 | Ferrari Dino 206 S | N.A.R.T. | red | FERRARI | | | closed | mid |
| 38 | Ferrari Dino 206 GT | N.A.R.T. | fark blue (+white/red) | | Goodyear | | closed | mid |
| 41 | Alfa Romeo GTA Junior | Escuderia Manana | red | | | | closed | front |
| 43 | Heppenstall Special Volkswagen | LeHigh Acres | white | | | | open | - |
| 44 | Porsche 907 2.2 | Escuderia Nacional C.S. | white | VALVOLINE | | Valvoline | closed | mid |
| 45 | Porsche 906 E | Smothers Brothers Racing Team | white | PORSCHE | Goodyear | Valvoline | closed | mid |
| 46 | Porsche 906 E | Escuderia Manana | white/green | | | | closed | mid |
| 47 | Porsche 911 T | P.A.R.T. | white (+green) | PART/FERODO/PORSCHE OF AMERICA | Goodyear | STP | closed | rear |
| 48 | Porsche 906 | Nationwide of Chicago Food Brothers, Inc. | blue | | | | closed | mid |
| 49 | Porsche 906 | Dr. Merv Rosen | white | Gulf | | Gulf | closed | mid |
| 50 | Porsche 911 T | Grand Prix Motor Oil | white | | | | closed | rear |
| 51 | Porsche 911 S | RBM Motors | dark green (+silver) | | | Valvoline | closed | rear |
| 52 | Porsche 911 T | Wicky Racing Team | red | | | | - | rear |
| 53 | Porsche 911 | Wilbur Pickett | red | | | | closed | rear |
| 54 | Porsche 911 | Fred Opert | silver | Fred Opert Racing/Gulf | Dunlop | Gulf/STP | closed | rear |
| 57 | Chevron B8 BMW | Raceco | yellow | | Goodyear | | closed | mid |
| 58 | BMW 2002 | Elsco Corporation | silver | ELSCO/FERODO | | | closed | front |
| 59 | BMW 2002 | Elsco Corporation | red | ELSCO/FERODO | | | closed | front |
| 60 | Opel Rallye | Jim Cooke Buick & Opel | gold | | Goodyear | Castrol | closed | front |
| 61 | Lotus 47 | Gerry Racing Enterprise, Inc. | white | Gerry RACING ENTERPRISE | | | closed | mid |
| 62 | MGB GT | British Leyland Motor Corporation | dark green | BRITISH LEYLAND | Dunlop | Castrol | closed | front |
| 63 | MGB | Waldron Motors | dark green (+yellow) | WALDRON MOTORS RACING TEAM | | Gulf/STP | hardtop | front |
| 64 | MGB | Waldron Motors | dark green (+yellow) | WALDRON MOTORS RACING TEAM | | | hardtop | front |
| 65 | Lancia Fulvia Sport Competizione | Algar Enterprises, Inc. | red | | | | - | front |
| 66 | Lancia Fulvia Coupé 1,6HF | Algar Enterprises, Inc. | orange | | Goodyear | | closed | front |
| 67 | Beach 4B Volkswagen | Competition Components | orange | | | | open | mid |
| 68 | Zink VSR Volkswagen | H.R.H. Corp. | white/blue | | | | open | mid |
| 69 | Lotus Europa | John F. Howard | yellow | | | | - | mid |
| 71 | Austin-Healey Sprite | Ring Free Oil Racing Team | blue | RING-FREE OIL RACING TEAM | | | closed | front |
| 72 | Austin-Healey Sprite | Ring Free Oil Racing Team | orange | RING-FREE OIL RACING TEAM | | | - | front |
| 73 | Austin-Healey Sprite | Arthur Tuckerman | white (+blue) | | Goodyear | | closed | front |
| 84 | Porsche 911 | Dr. Harold Williamson | red | | | | - | rear |
| 85 | Alfa Romeo GTA | Richard Crebs | green/white/red | | | | - | - |
| 88 | Shelby GT350 | Donald C. Cummings | white (+red) | | | | closed | front |
| 90 | Porsche 911 | P.A.R.T. | white | PART/FERODO/PORSCHE OF AMERICA | Goodyear | | closed | rear |
| 93 | Chevrolet Camaro | Todco Racing Canada Ltd. | white | | | | closed | front |
| 94 | Chevrolet Camaro | Norberto Mastandrea (Freeport Bahama Racing Team) | red (+light) | | | | closed | front |
| 98 | Volvo PV 544 | George W. Sanderson | green | | | | - | - |
| 99T | MGB | Gerry Racing Enterprise, Inc. | green | | | | - | front |