| 1 | McLaren / Bianchi | Ford Motor Co. (Shelby American) (USA) | Carroll Shelby | Ford | Mk II | | Ford | P+2.0 |
| 2 | Bucknum / Gardner | Ford Motor Co. (Shelby American) (USA) | Carroll Shelby | Ford | Mk II | | Ford | P+2.0 |
| 3 | Foyt / Gurney | Ford Motor Co. (Shelby American) (USA) | Carroll Shelby | Ford | Mk II | | Ford | P+2.0 |
| 4 | Donohue / Revson | Ford Motor Co. (Holman & Moody) (USA) | Holman & Moody | Ford | Mk II | | Ford | P+2.0 |
| 5 | Andretti / Ginther | Ford Motor Co. (Holman & Moody) (USA) | Holman & Moody | Ford | Mk II | | Ford | P+2.0 |
| 6 | Hulme / Ruby | Ford Motor Co. (Holman & Moody) (USA) | Holman & Moody | Ford | Mk II | | Ford | P+2.0 |
| 7 | Byrne / Thetford / Beazell | Herb W. Byrne (USA) | | Shelby | Cobra | | Ford | S+2.0 |
| 8 | Denman / Brown | Jim White Chevrolet Inc. (USA) | | Chevrolet | Corvette Grand Sport | | Chevrolet | P+2.0 |
| 9 | Maglioli / Casoni | Brescia Racing Corse (I) | | Ford | GT40 | | Ford | S+2.0 |
| 11 | Thompson / Ickx | J. W. Automotive (GD) (GB) | Grady Davis | Ford | GT40 | | Ford | S+2.0 |
| 14 | Johnson / Jennings / *Hill | Chaparral Cars, Inc. (USA) | | Chaparral | 2D | | Chevrolet | P+2.0 |
| 15 | Hill / Spence / *Hall | Chaparral Cars, Inc. (USA) | | Chaparral | 2F | | Chevrolet | P+2.0 |
| 16 | Chitwood / McClure | Joie Chitwood, Sr. (USA) | | Chevrolet | Camaro | I | Chevrolet | T+2.0 |
| 18 | West / Allison | Roger West (USA) | Roger West | Shelby | GT350 | R | Ford | GT+2.0 |
| 19 | Heppenstall / Seeley | Howmet Corp. (USA) | | Ford | Falcon | | Ford | T+2.0 |
| 20 | Wonder / Caldwell | William Wonder, Inc. (USA) | | Ford | GT40 | | Ford | S+2.0 |
| 21 | Yates / Krueger | Brock Yates (USA) | | Dodge | Dart | | Dodge | T+2.0 |
| 22 | Karmatz / Caldwell | JoKar Racing Associates (USA) | | Plymouth | Barracuda | | Plymouth | T+2.0 |
| 23 | Bandini / Amon | Ferrari s.p.a. (I) | Enzo Ferrari | Ferrari | 330 P3 | /4 Barchetta | Ferrari | P+2.0 |
| 24 | Parkes / Scarfiotti | Ferrari s.p.a. (I) | | Ferrari | 330 P4 | | Ferrari | P+2.0 |
| 26 | Rodriguez / Guichet | North American Racing Team (USA) | Luigi Chinetti | Ferrari | 412 P | Berlinetta | Ferrari | P+2.0 |
| 28 | Schlesser / Gregory / Gregg | North American Racing Team (USA) | | Ferrari | 365 P2 | | Ferrari | P+2.0 |
| 29 | Salas Guterrez / Rebaque, Sr. | Pedro Rodriguez, Jr. (MEX) | | Ferrari | 275 GTB | /C | Ferrari | GT+2.0 |
| 31 | Piper / Attwood | David Piper (GB) | David Piper | Ferrari | 365 P2 | /3 | Ferrari | P+2.0 |
| 32 | Clarke / Nelson | Peter Clarke (GB) | | Ferrari | 250 LM | | Ferrari | S+2.0 |
| 33 | Mairesse / "Beurlys" | Ecurie Francorchamps (B) | | Ferrari | 412 P | Berlinetta | Ferrari | P+2.0 |
| 34 | Kolb / Fulp | Harrah Modern Classic Motors | | Ferrari | Dino 206 S | | Ferrari | P2.0 |
| 36 | Wintersteen / Welch / Brown / *Donohue | Roger Penske (USA) | Roger Penske | Chevrolet | Camaro | I Z28 | Chevrolet | T+2.0 |
| 40 | Fisher / Eaton | Craig Fisher (CDN) | | Chevrolet | Camaro | I | Chevrolet | T+2.0 |
| 42 | Somner / Levetto | Cannons Auto Service (USA) | | Triumph | TR4 | A | Triumph | GT+2.0 |
| 43 | Kelder / Dube | Cannons Auto Service (USA) | | Triumph | TR4 | A | Triumph | GT+2.0 |
| 44 | Stoutenburg / Taylor / McCluskey | Raymond Stoutenburg (USA) | | Triumph | TR4 | A | Triumph | GT+2.0 |
| 45 | Canada / Hines, Jr. / Kelly | Joe C. Hines, Jr. (USA) | | Triumph | TR4 | | Triumph | GT+2.0 |
| 46 | Robson / Rodgers / Buchman | Richard B. Robson, Jr. (USA) | Richard Robson | Jaguar | E-type | | Jaguar | GT+2.0 |
| 47 | Gethin / Opert / Pike | Fred Opert Racing (USA) | | Chevron | B4 | | BMW | P2.0 |
| 48 | Burr / Owen / Cavin | Tim Burr (Atlas Van Lines) (USA) | Tim Burr | Triumph | TR4 | | Triumph | GT+2.0 |
| 51 | Mitter / Rindt | Porsche of Stuttgart (D) | | Porsche | 906 | E | Porsche | P2.0 |
| 52 | Herrmann / Siffert | Porsche of Stuttgart (D) | | Porsche | 910 | | Porsche | P2.0 |
| 53 | Schütz / Stommelen / van Lennep | Porsche of Stuttgart (D) | | Porsche | 906 | E | Porsche | P2.0 |
| 54 | Ryan / Bencker | RBM Motors (USA) | Jack Ryan | Porsche | 911 | S | Porsche | GT2.0 |
| 55 | Spoerry / Steinemann | Squadra Tartaruga Switz. (CH) | | Porsche | 906 | LH | Porsche | P2.0 |
| 56 | Vögele / Habegger / *Müller | Charles Vogele (CH) | | Porsche | 906 | LH | Porsche | S2.0 |
| 58 | Dean / Taylor | Rod Savyer (GB) | | Porsche | 906 | | Porsche | S2.0 |
| 61 | Drolsom / Williamson | George P. Drolsom (USA) | | Porsche | 911 | | Porsche | T2.0 |
| 63 | Grossman / Krinner | Dockery Ford, Inc. (USA) | | Shelby | GT350 | R | Ford | GT+2.0 |
| 66 | Yeager / Hane / Feistmann | Thomas D. Yaeger (USA) | | Ford | Mustang | | Ford | T+2.0 |
| 67 | van Beuren, Jr. / Jett / Pike | Dos Caballos Racing, Inc. (MEX) | Freddy van Beuren | Shelby | GT350 | R | Ford | GT+2.0 |
| 71 | Taylor / Drolet / Guthrie | Ring Free Oil Racing Team (USA) | | Ford | Mustang | | Ford | T+2.0 |
| 72 | Richards / Cuomo / Norwood | Ring Free Oil Racing Team (USA) | | Ford | Mustang | | Ford | T+2.0 |
| 73 | Tremblay / Perkins | Dr. J. Peter Marinelli (USA) | | Volvo | P1800 | | Volvo | GT2.0 |
| 74 | Mollin / Riley | Arthur Mollin Racing Ent. (USA) | | Volvo | 122 | S | Volvo | T2.0 |
| 75 | Maxwell / Martin | Dr. I. A. Maxwell, Jr. (USA) | | Volvo | 122 | S | Volvo | T2.0 |
| 76 | McComb / Dooley | John McComb (USA) | | Ford | Mustang | | Ford | T+2.0 |
| 77 | Bentley / Beddow | Precision Auto, Inc. (USA) | | Alfa Romeo | Giulia Sprint GTA | | Alfa Romeo | T2.0 |
| 82 | Theodoracopulos / Posey / Haynes | Harry Theodoracopulos (USA) | | Alfa Romeo | Giulia Sprint GTA | | Alfa Romeo | T2.0 |
| 84 | Ganger / Weaver / Goodman | Richard N. Ganger (USA) | | MG | B | GT | BMC | P2.0 |
| 85 | Goodman / Baker | Jim Baker (USA) | | Alfa Romeo | Giulia Sprint GTA | | Alfa Romeo | T2.0 |
| 86 | Eve / Croucher / Glenn | Kenneth G. Chambliss (USA) | | MG | B | | BMC | GT2.0 |
| 87 | Freeman / Weaver / Marshall | Chet Freeman (USA) | | Ford | Cortina Lotus | | Ford | T2.0 |
| 89 | Bremer / Kearney / Turner | Ross L. Bremer (USA) | Billy Turner | Ford | Cortina Lotus | | Ford | T2.0 |
| 90 | Taylor / Pratt / Lyon | Del O. Taylor (USA) | | Alfa Romeo | Giulia Sprint GTA | | Alfa Romeo | T2.0 |
| 96 | Mims / Dietrich | Jim Baker (USA) | | ASA | 411 | | ASA | P2.0 |