| 1st | 6 | Mark Donohue / David Hobbs | Ferrari 512 M spec. | Penske-White Racing | 1:42.4200 |
| 2nd | 2 | Pedro Rodriguez / Jackie Oliver | Porsche 917 K | J. W. Automotive Engineering | 1:43.6800 |
| 3rd | 22 | Peter Revson / Sam Posey / Chuck Parsons / Luigi Chinetti, Jr. | Ferrari 512 M | North American Racing Team | 1:43.9500 |
| 4th | 1 | Jo Siffert / Derek Bell | Porsche 917 K | J. W. Automotive Engineering | 1:44.4400 |
| 5th | 20 | Masten Gregory / Gregg Young | Ferrari 512 M | Young American Racing/North American Racing Team | 1:46.6500 |
| 6th | 23 | Ronnie Bucknum / Tony Adamowicz | Ferrari 512 S Spyder | North American Racing Team | 1:50.2000 |
| 7th | 28 | Arturo Merzario / José Juncadella | Ferrari 512 S | Escuderia Montjuich | 1:51.2100 |
| 8th | 26 | Gustave Gosselin / Hughes de Fierlant | Ferrari 512 S | Jacques Swaters | 1:54.1400 |
| 9th | 11 | Tony DeLorenzo / Don Yenko / John Mahler | Chevrolet Corvette C3 | Owens Corning Fiberglass | 1:57.1900 |
| 10th | 12 | Jerry Thompson / John Mahler | Chevrolet Corvette C3 | Owens Corning Fiberglass | 1:59.0000 |
| 11th | 4 | Vic Elford / Gijs van Lennep | Porsche 917 K | Martini & Rossi Racing Team | 1:45.3900 |
| 12th | 3 | Helmut Marko / Rudi Lins | Porsche 917 K | Martini & Rossi Racing Team | 1:45.5600 |
| 13th | 21 | Nestor Garcia-Veiga / Luigi Chinetti, Jr. / Alain De Cadenet | Ferrari 312 P/71 | North American Racing Team | 1:58.9500 |
| 14th | 50 | John Greenwood / Allan Barker / Dick Lang | Chevrolet Corvette | John Greenwood | 2:00.7800 |
| 15th | 47 | John Tremblay / Bill McDill / Bob Beatty | Chevrolet Camaro I | Bruce Behrens Racing | 2:04.0000 |
| 16th | 57 | Dave Heinz / Or Costanzo | Chevrolet Corvette C3 | David Heinz Racing, Inc. | 2:07.0800 |
| 17th | 17 | Vince Gimondo / Chuck Dietrich | Chevrolet Camaro II Z/28 | Tokondo Racing | 2:08.6900 |
| 18th | 45 | Clive Baker / Bob Grossman / Sam Brown / Charles Reynolds | Chevron B16 Ford | Baker Motor Company | 2:08.7500 |
| 19th | 79 | Hal Lawrence / Dan Moore / Gary Bishop | Shelby GT350 | Danny L. Moore | 2:11.0000 |
| 20th | 64 | Robert Luebbe / Bob Baechle / John Orr | Chevrolet Corvette | Robert Luebbe | 2:11.0000 |
| 21st | 98 | Ed Matthews / Swede Savage / Danny Ongais | Ford Mustang | Ed Matthews | 2:12.0000 |
| 22nd | 72 | Bob Mitchell / Charlie Kemp | Chevrolet Camaro | Robert R. Mitchell | 2:12.0000 |
| 23rd | 59 | Peter Gregg / Hurley Haywood | Porsche 914/6 | Brumos Porsche Audi Corp | 2:12.0100 |
| 24th | 97 | Warren Stumes / Don Cummings | Shelby GT350 | Susan Trumbull Cummings | 2:13.4100 |
| 25th | 36 | Warren Matzen / Tom Heyser / Dick Sears | Ford Mustang | Racing Specialties Co. | 2:14.0000 |
| 26th | 88 | Norberto Mastandrea / Tony Lilly | Chevrolet Camaro Z/28 | Norberto Mastandrea | 2:14.0000 |
| 27th | 31 | Bert Everett / Jim Locke / Jim Netterstrom | Porsche 911 T | Locke Lake Colony | 2:15.0000 |
| 28th | 5 | Jacques Duval / George Nicholas / Bob Bailey | Porsche 914/6 | Sun Oil Company | 2:15.0000 |
| 29th | 14 | C. C. Canada / Joe Hines, Jr. / Wilbur Pickett | Chevrolet Camaro Z/28 | Boykin Auto Repairs | 2:15.3100 |
| 30th | 15 | Peter Kirill / Ash Tisdelle | Porsche 911 S | K&T Enterprises | 2:16.0000 |
| 31st | 33 | John McComb / Bob Tullius | Ford Mustang | John McComb | 2:16.0900 |
| 32nd | 19 | Stephen Behr / John Buffum / Erwin Kremer | Porsche 914/6 | Ralph Meaney | 2:16.4600 |
| 33rd | 18 | Ralph Meaney / Bill Bean / Gary Wright | Porsche 914/6 | Ralph Meaney | 2:16.5900 |
| 33rd | 10 | Ray Walle / Michael Sherwin | Porsche 911 S | Walle Enterprises | 2:21.1000 |
| 34th | 74 | Al Straub / Walter Brown | Ford Mustang | Al Straub | 2:00.0000 |
| 35th | 92 | John Cordts / Don Pike | Pontiac Firebird | B.F. Goodrich Tire Co. | 2:30.0000 |
| 36th | 8 | Tom Nehl / Perry | Porsche 911 S | American Racing Promotions | 2:18.0000 |
| 37th | 89 | Ray Brimble / Houghton Smith | Chevrolet Camaro | H. Houghton Smith | 2:18.0000 |
| 38th | 43 | Jean-Pierre Hanrioud / Jean Sage | Chevron B16 Ford | Jean-Pierre Hanrioud | 2:18.7600 |
| 39th | 16 | Michael Keyser / Bob Beasley / Bruce Jennings | Porsche 911 S | Toad Hall Racing | 2:19.0000 |
| 40th | 44 | Bob Hindson / Kendall Noah / Art Bunker | Porsche 911 T | Art Bunker | 2:30.0000 |
| 41st | 42 | Javier Garcia / Luis Sereix / Richard Small | Chevrolet Camaro Z/28 | Garcia Racing Jose M. Garcia | 2:20.0000 |
| 42nd | 40 | Fritz Hochreuter / Rudy Bartling | Porsche 911 | Fritz Hochreuter | 2:21.0000 |
| 44th | 91 | Ralph Noseda / Pepe Nunez | Chevrolet Camaro Z/28 | Larrauri Racing | 2:23.0000 |
| 45th | 48 | Sheldon Dobkin / John Maynard / John Oliver | Chevrolet Camaro I | S-Car-Go-Racing | 2:23.6100 |
| 46th | 51 | Jim Gammon / Dean Donley / Carlos Garza | MGB GT | Waldron Motors Racing Team | 2:24.5700 |
| 47th | 52 | Ben Scott / Lowell Lanier / Dave Houser | MGB GT | Waldron Motors Racing Team | 2:26.0000 |
| 48th | 70 | John Belperche / William Davidson | Triumph GT6 | William A. Davidson | 2:29.0000 |