| No | 
Pilote | 
Team | 
Voiture | 
| 1 | Tony DeLorenzo/Jerry Thompson | Troy Promotions Inc | Chevrolet Corvette | 
| 2 | Dick Lang/Gib Hufstaeder | Troy Promotions Inc | Chevrolet Corvette | 
| 3 | Ed Lowther/Robert D.Esseks/Frank Dominianni | Robert D. Esseks | Chevrolet Corvette | 
| 4 | Or Costanzo/Dave Heinz | Troy Promotions Inc | Chevrolet Corvette | 
| 5 | Don Yenko/Bob Grossman | Best Photo Service | Chevrolet Camaro Z28 | 
| 6 | Garry R.Davis/Herbert R.Madray/Don Madray | Herbert Madray | Ford Mustang | 
| 7 | Charlie Rainville/Paul Pettey | Argento Racing Organisation | Ford Mustang | 
| 9 | Ronnie Bucknum/Mark Donohue | Roger Penske Racing | Lola T70 Mk.3B | 
| 10 | Scooter Patrick/Dave Jordan | American International Racing | Lola T70 Mk.3 | 
| 11 | Lothar Motschenbacher/Ed Leslie | American International Racing | Lola T70 Mk.3 | 
| 14 | Ulf Norinder/Jo Bonnier | Ecurie Bonnier/Sportcars | Lola T70 Mk.3B | 
| 16 | Richard Stevens/Robert Barg | Rick Stevens | Chevrolet Camaro | 
| 17 | Vince Gimondo/John Tremblay | Bruce Behrens Racing Enterprise | Chevrolet Camaro | 
| 18 | Wilton T. Jowett Jr/Bob Tullius | Wilton T. Jowett | Chevrolet Camaro | 
| 19 | Maurice Carter/Nat Adams | Maurice Carter Chevrolet | Chevrolet Camaro | 
| 20 | David McClain/Don Kerney | David H. McClain | Chevrolet Camaro | 
| 21 | Larry Dent/Larry Bock | Laurel/Drover Racing | Chevrolet Camaro | 
| 22 | Jacky Ickx/Jackie Oliver | John Wyer Automotive Engine | Ford GT40 | 
| 23 | David Hobbs/Mike Hailwood | John Wyer Automotive Engine | Ford GT40 | 
| 24 | Francis C. Grant/Dieter Oest | Auto Enterprises | Ford GT40 | 
| 25 | Chris Amon/Mario Andretti | Ferrari SpA SEFAC | Ferrari 312P | 
| 26 | Pedro Rodriguez/Chuck Parsons | North American Racing Team | Ferrari 330P3 | 
| 27 | Rolf Stommelen/Joe Buzzetta | Porsche System Engineering | Porsche 908/02 | 
| 28 | Hans Herrmann/Kurt Ahrens Jr/Rolf Stommelen | Porsche System Engineering | Porsche 908/02 | 
| 29 | Gerhard Mitter/Udo Schütz | Porsche System Engineering | Porsche 908/02 | 
| 30 | Vic Elford/Richard Attwood | Porsche System Engineering | Porsche 908/02 | 
| 31 | Jo Siffert/Brian Redman | Porsche System Engineering | Porsche 908/02 | 
| 32 | Mario Casoni/Andrea de Adamich | Autodelta SpA | Alfa Romeo T33-3 | 
| 33 | Nino Vaccarella/Lucien Bianchi | Autodelta SpA | Alfa Romeo T33-3 | 
| 34 | Nanni Galli/Ignazio Giunti | Autodelta SpA | Alfa Romeo T33-3 | 
| 35 | Andrew Hedges/Paddy Hopkirk | British Leyland Motor Corporation | MGC | 
| 36 | Bill Brack/R.Craig Hill | British Leyland Motor Corporation | MGC | 
| 37 | Riccardo Rodriguez/Charlie Kolb | North American Racing Team | Ferrari Dino 206S | 
| 38 | Sam Posey/Bob Dini | North American Racing Team | Ferrari Dino 206S | 
| 41 | Armando de Ambadgio/Sergio Trevale | Escuderia Manana | Alfa Romeo GTA Junior | 
| 43 | Ray Heppenstall/Howard Brown | LeHigh Acres | Heppenstall Special Volkswagen | 
| 44 | Alex Soler-Roig/Rudi Lins | Escuderia Nacional SC | Porsche 907 | 
| 45 | Fred Baker/Dick Smothers | Smothers Bros. Racing Team | Porsche 906LE | 
| 46 | Armando Capriles/Alfredo Atencio | Escuderia Manana | Porsche 906LE | 
| 47 | Bob Bailey/Jim Locke | PART | Porsche 911T | 
| 48 | Mike Rahal/Bill Stroh/Hugh Wise | Mike Rahal | Porsche 906 | 
| 49 | Merv Rosen/Dave Morrell | Dr. Merv Rosen | Porsche 906 | 
| 50 | Jacques Duval/George Nicholas | Grand Prix Motor Oil | Porsche 911T | 
| 51 | Gregg Loomis/Pete Harrison/Jack Ryan | RBM Motors | Porsche 911S | 
| 52 | Gérard Larrousse/André Wicky/Jean Sage | Wicky Racing Team | Porsche 911T | 
| 53 | Wilbur Pickett/Peter Gregg | Wilbur Pickett | Porsche 911 | 
| 54 | Paul Sanford/Fred Opert | Fred Opert Racing Team | Porsche 911 | 
| 57 | Umberto Maglioli/Hugh Kleinpeter/Bob Beatty | Raceco Miami | Chevron B8 BMW | 
| 58 | Ed Hugus/Chuck Dietrich/Eugene Nearburg | Elsco Corporation | BMW 2002 | 
| 59 | Smokey Drolet/Rosemary Smith | Elsco Corporation | BMW 2002 | 
| 60 | Walter Brown/Joe Marcus | Jim Cooke Buick & Opel | Opel Kadett Rallye | 
| 62 | Logan Blackburn/Gerald Truitt | British Leyland Motor Corporation | MGB GT | 
| 63 | Jim Gammon/Ray Mummery/Roger Houghton | Waldron Motors | MGB | 
| 64 | Chris Waldron/Ben Scott/Dean Donley | Waldron Motors | MGB | 
| 65 | Claudio Maglioli/Raffaele Pinto | Algar Enterprises Inc | Lancia Fulvia HF Zagato | 
| 66 | Innes Ireland/Mike Tillson/Howard Hanna | Algar Enterprises Inc | Lancia Fulvia HF Zagato | 
| 67 | Bill Boye/Russ Shirey | Competition Components | Beach 4B Volkswagen | 
| 68 | Bill Scott/Jim McDaniel/Steve Pieper | HRH Corporation | Zink VSR Volkswagen | 
| 69 | Reggie Smith Jr/Tony Lilly/Don Pickett | John F. Howard | Lotus Europa Renault | 
| 71 | Jim Baker/Paul Richards/Clive Baker | Ring Free Oil Racing Team | Austin-Healey Sprite | 
| 72 | Janet Guthrie/Donna Mae Mims/Liane Engeman | Ring Free Oil Racing Team | Austin-Healey Sprite | 
| 73 | Gregg Cameron/Ralph Kemmerer | Arthur Tuckerman | Austin-Healey Sprite | 
| 84 | George Drolsom/Harold Williamson | Dr. Harold Williamson | Porsche 911 | 
| 85 | Richard Crebs/Ronald Strickler/Robert Whitaker | Richard Crebs | Alfa Romeo GTA | 
| 88 | Randy Blessing/Don Cummings/Warren Stumes | Donald C. Cummings | Shelby GT350 | 
| 90 | Jim Netterstrom/Bruce Jennings/Mike Downs | PART | Porsche 911 | 
| 93 | Craig Fisher/Serge Adams | Todco Racing Canada Ltd | Chevrolet Camaro | 
| 94 | Robin Ormes/Norberto Mastandrea | Freeport Bahama Racing Team | Chevrolet Camaro | 
| 98 | Ronald D.Polimeni/Robert Theall | George W.Sanderson | Volvo PV544 | 
| 99T | John Colgate/Don Parks | Gerry Racing Enterprise | MGB |