| No |
Pilote |
Team |
Voiture |
| 1 | Jo Siffert/Gijs van Lennep | John Wyer Automotive Engine | Porsche 917K |
| 2 | Derek Bell/Richard Attwood | John Wyer Automotive Engine | Porsche 917K |
| 6 | Mark Donohue/David Hobbs | Roger Penske/Kirk F.White | Ferrari 512M |
| 14 | Sam Posey/Ronnie Bucknum | North American Racing Team | Ferrari 512M |
| 16 | Michael Keyser/Bruce Jennings | Toad Hall Racing | Porsche 911T |
| 21 | Gregg Young/Jim Adams | Young American Racing Team | Ferrari 512M |
| 30 | Andrea de Adamich/Ronnie Peterson | Autodelta S.p.A | Alfa Romeo T33/3 |
| 31 | Bert Everett/Bob Beasley | Locke Development Corporation | Porsche 911T |
| 32 | Jim Locke/Bob Bailey | Locke Development Corporation | Porsche 911S |
| 33 | Henri Pescarolo/Rolf Stommelen | Autodelta S.p.A | Alfa Romeo T33/3 |
| 35 | Vic Elford/Nanni Galli | Autodelta S.p.A | Alfa Romeo 33TT3 |
| 36 | Nanni Galli/Vic Elford | Autodelta S.p.A | Alfa Romeo T33/3 |
| 40 | Jacky Ickx/Mario Andretti | S.p.A. Ferrari SEFAC | Ferrari 312PB |
| 41 | Bill Schumacher/Bob McClure/Bob Kiefer | Iroquois Racing Associates | Chevrolet Corvette |
| 43 | Tony Adamowicz/Mario Cabral | David Piper Racing | Porsche 917K |
| 46 | Mike Rahal/Hugh Wise/Horst Kroll | Brokers Racing/Nationwide | Porsche 906 |
| 48 | Herbert Müller/George Eaton | Herbert Müller Racing | Ferrari 512M |
| 49 | Robert R.Johnson/John Greenwood | John Greenwood Racing | Chevrolet Corvette |
| 50 | Richard Hoffman/Frank Cipelle/John Greenwood | John Greenwood Racing | Chevrolet Corvette |
| 57 | Dave Heinz/Don Yenko | Or Costanzo/Tri City Corvette | Chevrolet Corvette |
| 59 | Peter Gregg/Hurley Haywood | Brumos Porsche-Audi | Porsche 914/6 GT |
| 60 | Robin Ormes/Bobby Brown/Bob Bondurant | Bahamas Racing | Lola T70 Mk.3 |
| 61 | Hugh Kleinpeter/Tony Belcher | Promotional Advertising | Lola T212 Ford |
| 63 | Alain De Cadenet/Lothar Motschenbacher | Ecurie Francorchamps | Ferrari 512M |
| 64 | Bob Baechle/Michael Summers/Fred Kepler | Bob Baechle | Chevrolet Corvette |
| 67 | Pete Harrison/Tom Fraser/Bobby Rinzler/Skip Barber | Baker Motor Co | Lola T212 Ford |
| 68 | Pat Keating/Levon Pentecost/Anthony Torgersen | Baker Motor Co | Porsche 911S |
| 80 | Milt Minter/Rudy Bartling/Fritz Hochreuter | Fritz Hochreuter | Porsche 911 |
| 87 | Tony Dean/Steve Matchett/Chuck Parsons | A.G.Dean Racing | Porsche 908/02 |