| 1st | 1 | Derek Bell / Howden Ganley | Mirage M6 Ford | Gulf Racing | 1:45.5120 |
| 2nd | 3 | François Cevert / Jean-Pierre Beltoise / Henri Pescarolo | Matra-Simca MS670 | Equipe Matra-Simca | 1:47.5420 |
| 3rd | 2 | Mike Hailwood / John Watson | Mirage M6 Ford | Gulf Racing | 1:48.9630 |
| 4th | 12 | Reine Wisell / Hughes de Fierlant / Jean-Louis Lafosse | Lola T282 Ford | Scuderia Filipinetti | 1:55.1720 |
| 5th | 19 | Rudy Bartling / Harry Bytzek / Bert Kuehne | Porsche 908/02 Flunder | Harry Bytzek | 1:57.7000 |
| 6th | 11 | Tony DeLorenzo / Maurice Carter | Chevrolet Corvette C3 454 | Troy Promotions Inc. | 1:58.8950 |
| 7th | 34 | Jerry Thompson / Ike Knupp / Mike Murray | Chevrolet Corvette | Murray Racing | 2:00.5180 |
| 8th | 59 | Peter Gregg / Hurley Haywood | Porsche 911 Carrera RSR | Brumos Porsche | 2:02.1560 |
| 9th | 10 | Bill Barber / Charlie Kemp | Chevron B19 Ford | Shierson Racing | 2:02.1880 |
| 10th | 47 | Tim Chitwood / Joie Chitwood / Bob Nagel | Chevrolet Camaro Z28 | Chitwood Racing | 2:02.3410 |
| 11th | 52 | Hugh Kleinpeter / Jim Gammon / Tom Shelton | Chevron B21 Ford | Promotion Advertising | 2:02.3430 |
| 12th | 6 | Mark Donohue / George Follmer | Porsche Carrera RSR | Penske Racing | 2:02.7940 |
| 13th | 5 | Dave Heinz / Bob McClure / Dana English | Chevrolet Corvette | Dave Heinz | 2:03.1860 |
| 14th | 64 | Bob Baechle / Roger Pierce / Alex Davidson | Chevrolet Corvette C3 | Weaver Chevrolet | 2:05.0180 |
| 15th | 17 | Vince Gimondo / Billy Dingman | Chevrolet Camaro Z28 | Takondo Racing | 2:05.1530 |
| 16th | 23 | Claude Ballot-Léna / Jean-Claude Andruet | Ferrari 365 GTB/4 | North American Racing Team | 2:05.3850 |
| 17th | 21 | Luigi Chinetti, Jr. / Bob Grossman / Wilbur Shaw, Jr. | Ferrari 365 GTB/4 | North American Racing Team | 2:05.4080 |
| 18th | 48 | John Greenwood / Ron Grable | Chevrolet Corvette | John Greenwood | 2:06.5670 |
| 19th | 8 | Tom Nehl / Steve Durst | Chevrolet Camaro Z28 | Automotive Engineering Enterprises | 2:06.8590 |
| 20th | 93 | Bob Fisher / Tom Gloy | Chevron B16 Ford | Professional Racing | 2:06.9310 |
| 21st | 94 | Steve Ross / Bob Mitchell / Dave Houser | Chevrolet Camaro Z28 | Bolus & Snopes | 2:07.4600 |
| 22nd | 20 | Jean-Pierre Jarier / Arturo Merzario | Ferrari 365 GTB/4 | North American Racing Team | 2:07.7480 |
| 23rd | 54 | John Fitzpatrick / Erwin Kremer / Paul Keller | Porsche 911 S | Porsche Kremer Racing | 2:07.8120 |
| 24th | 75 | Larry Bock / Carl Shafer / Gene Harrington | Chevrolet Camaro II Z28 | Don Winter | 2:07.8710 |
| 25th | 22 | François Migault / Milt Minter | Ferrari 365 GTB/4 | North American Racing Team | 2:07.9210 |
| 26th | 15 | Michael Keyser / Tony Adamowicz / Bob Beasley | Porsche 911 S | Toad Hall Motor Racing | 2:08.5030 |
| 27th | 9 | Ray Kessler / Ritchie Panch / Wilbur Pickett | Chevrolet Camaro Z28 | Ray Kessler Inc. | 2:08.8540 |
| 28th | 49 | Don Yenko / Robert R. Johnson | Chevrolet Corvette | John Greenwood | 2:09.0200 |
| 29th | 31 | Jim Locke / Bob Bailey | Porsche 911 S | Locke Development Corporation | 2:09.1060 |
| 30th | 25 | Bert Everett / John Buffum / Wilbur Pickett | Ford Escort | John Buffum | 2:09.5320 |
| 31st | 43 | Dave Helmick / John O'Steen / Stephen Behr | Porsche 911 S | Dave Helmick | 2:09.5690 |
| 32nd | 77 | George Stone / Bruce Jennings / Mike Downs | Porsche 911 S | Silverstone Racing | 2:10.4190 |
| 33rd | 29 | Ralph Noseda / Ray Mummery | Chevrolet Camaro | Jef Stevens | 2:11.2520 |
| 34th | 24 | Fred van Beuren, Jr. / Guillermo Rojas / Hector Rebaque | Ford Escort | John Buffum | 2:12.2130 |
| 35th | 88 | Ed Abate / Bill Cuddy | Porsche 910 | Edwin G. Abate | 2:12.2630 |
| 36th | 55 | Tiny Lund / Stephen Behr / Jimmy Capps | Pontiac Firebird | Tiny Lund | 2:13.0630 |
| 37th | 58 | Andrew Carduner / Jacques Bienvenue | Porsche 911 S | Brumos Porsche | 2:14.3360 |
| 38th | 80 | John Elliott / Bill McDill | Chevrolet Camaro Z28 | Byron Cook Racing | 2:14.7660 |
| 39th | 56 | Sepp Greger / Kurt Hild / Dieter Schmid | Porsche 911 S | Joest Racing | 2:15.0070 |
| 40th | 33 | John McComb / Dave Dooley | Ford Mustang | John McComb | 2:15.5460 |
| 41st | 16 | Peter Kirill / Russ Norburn / Bill Bean | Porsche 911 S | Toad Hall Motor Racing | 2:15.6590 |
| 42nd | 89 | Mike Tillson / Al Holbert / Dieter Oest | Porsche 911 S | Holbert Porsche | 2:16.0380 |
| 43rd | 14 | C. C. Canada / Bob Christiansen / John Tremblay | Chevrolet Camaro I Z28 | C. C. Canada | 2:17.0050 |
| 44th | 62 | Bob Bergstrom / Jim Cook | Porsche 911 S | Bob Bergstrom | 2:18.3670 |
| 45th | 99 | Horacio Alvarez / Diego Febles | Porsche 911 S | Diego Febles | 2:18.4230 |
| 46th | 30 | Mario Levetto / Guido Levetto / Ara Dube | Chevrolet Camaro Z28 | Guido C. Levetto | 2:18.7150 |
| 47th | 57 | Reinhold Jöst / Mario Casoni / Paul Blancpain | Porsche 908/03 | Reinhold Jöst | no time |
| 48th | 96 | Jose Rodriguez / Reinaldo Almeida | Chevrolet Camaro Z28 | U.S. Davis Racing | 2:19.6520 |
| 49th | 41 | Raymond Gage / Jim Grob / Gary Ouellette | Lotus 23 BMW | Parametrics Systems | no time |
| 50th | 7 | Clay Young / Eddie Johnson / Jim Fitzgerald | Chevrolet Camaro Z28 | Eddie Johnson | no time |
| 51st | 51 | Klaus Selbert / W. Marvin Schoenfeld / Bob Klempel | Porsche 911 S | Airport Motorsport | no time |
| 52nd | 84 | Andy Petery / Hans Ziereis | BMW 2002 | Andy Petery | no time |
| 53rd | 38 | Daniel Muniz / Roberto Quintanilla | Porsche 914/6 | Quintanilla/Muniz | no time |