| 1st | 6 | Mark Donohue / David Hobbs | Ferrari 512 M | Roger Penske/Kirk F. White | 1:07.7400 |
| 2nd | 1 | Jo Siffert / Gijs van Lennep | Porsche 917 K | J. W. Automotive Engineering | 1:08.5100 |
| 3rd | 40 | Jacky Ickx / Mario Andretti | Ferrari 312 PB | S.p.A. Ferrari SEFAC | 1:08.6400 |
| 4th | 2 | Derek Bell / Richard Attwood | Porsche 917 K | J. W. Automotive Engineering | 1:08.9700 |
| 5th | 14 | Sam Posey / Ronnie Bucknum | Ferrari 512 M | North American Racing Team | 1:09.1000 |
| 6th | 30 | Andrea de Adamich / Ronnie Peterson | Alfa Romeo T33/3 | Autodelta S.p.A. | 1:09.2200 |
| 7th | 33 | Henri Pescarolo / Rolf Stommelen | Alfa Romeo T33/3 | Autodelta S.p.A. | 1:09.8000 |
| 8th | 35 | Vic Elford / Nanni Galli | Alfa Romeo T33/TT/3 | Autodelta S.p.A. | 1:11.0000 |
| 9th | 48 | Herbert Müller / George Eaton | Ferrari 512 M | Herbert Müller Racing | 1:11.5100 |
| 10th | 63 | Alain De Cadenet / Lothar Motschenbacher | Ferrari 512 M | Ecurie Francorchamps | 1:12.7300 |
| 11th | 43 | Tony Adamowicz / Mario Cabral | Porsche 917 K | David Piper Racing | 1:15.3800 |
| 12th | 21 | Gregg Young / Jim Adams | Ferrari 512 M | Young American Racing Team | 1:15.5800 |
| 13th | 36 | Nanni Galli / Vic Elford | Alfa Romeo T33/3 | Autodelta S.p.A. | 1:16.0700 |
| 14th | 67 | Pete Harrison / Tom Fraser / Bobby Rinzler / Skip Barber | Lola T212 Ford | Baker Motor Co. | 1:17.5800 |
| 15th | 87 | Tony Dean / Steve Matchett / Chuck Parsons | Porsche 908/02 | A. G. Dean (Racing) | 1:18.9800 |
| 16th | 61 | Hugh Kleinpeter / Tony Belcher | Lola T212 Ford | Promotional Advertising | 1:20.3000 |
| 17th | 49 | Robert R. Johnson / John Greenwood | Chevrolet Corvette | John Greenwood Racing | 1:21.7600 |
| 18th | 46 | Mike Rahal / Hugh Wise / Horst Kroll | Porsche 906 K | Brokers Racing/Nationwide Food | 1:23.1400 |
| 19th | 59 | Peter Gregg / Hurley Haywood | Porsche 914/6 | Brumos Porsche-Audi | 1:24.8000 |
| 20th | 57 | Dave Heinz / Don Yenko | Chevrolet Corvette | Or Costanzo/Tri City Corvette Club | 1:25.2900 |
| 21st | 32 | Jim Locke / Bob Bailey | Porsche 911 S | Locke Development Corporation | 1:26.0000 |
| 22nd | 68 | Pat Keating / Levon Pentecost / Anthony Torgersen | Porsche 911 S | Baker Motor Co. | 1:26.3000 |
| 23rd | 64 | Bob Baechle / Michael Summers / Fred Kepler | Chevrolet Corvette | Bob Baechle | 1:26.3200 |
| 24th | 50 | Richard Hoffman / Frank Cipelle / John Greenwood | Chevrolet Corvette | John Greenwood Racing | 1:26.3400 |
| 25th | 80 | Milt Minter / Rudy Bartling / Fritz Hochreuter | Porsche 911 | Fritz Hochreuter | 1:26.6000 |
| 26th | 31 | Bert Everett / Bob Beasley | Porsche 911 T | Locke Development Corporation | 1:28.5200 |
| 27th | 60 | Robin Ormes / Bob Brown / Bob Bondurant | Lola T70 Mk.3B GT Chevrolet | Bahamas Racing | no time |
| 28th | 16 | Michael Keyser / Bruce Jennings | Porsche 911 T | Toad Hall Racing | no time |
| 28th | 41 | Bill Schumacher / Bob McClure / Bob Kiefer | Chevrolet Corvette | Iroquois Racing Associates | no time |