| 1st | 28 | Mario Andretti / Arturo Merzario / Jacky Ickx | Ferrari 512 S | Ferrari s.p.a. | 1:51.6000 |
| 2nd | 1 | Jo Siffert / Brian Redman | Porsche 917 K | J. W. Engineering | 1:52.9000 |
| 3rd | 2 | Pedro Rodriguez / Leo Kinnunen / Brian Redman | Porsche 917 K | J. W. Engineering | 1:55.8000 |
| 4th | 3 | Kurt Ahrens, Jr. / Vic Elford | Porsche 917 K | Porsche Konstruktionen KG | 1:56.1000 |
| 5th | 27 | Peter Schetty / Jacky Ickx | Ferrari 512 S | Ferrari s.p.a. | 1:56.9000 |
| 6th | 25 | Dan Gurney / Chuck Parsons | Ferrari 512 S | North American Racing Team | 1:57.8000 |
| 7th | 33 | François Cevert / Jack Brabham | Matra-Simca MS650 | Matra Sports | 1:58.7000 |
| 8th | 26 | Nino Vaccarella / Ignazio Giunti | Ferrari 512 S | Ferrari s.p.a. | 1:59.0000 |
| 9th | 24 | Sam Posey / Mike Parkes | Ferrari 312 P Coupe | North American Racing Team | 2:02.4000 |
| 10th | 5 | John Cannon / George Eaton | Lola T70 Mk.3B GT Chevrolet | Randy's Auto Body Service | 2:03.8000 |
| 11th | 7 | Jerry Thompson / John Mahler | Chevrolet Corvette C3 | Owens Corning Fibreglass | 2:04.6000 |
| 12th | 53 | Hans Laine / Gijs van Lennep | Porsche 908/02 | Racing Team AAW | 2:05.2000 |
| 13th | 23 | Tony Adamowicz / David Piper | Ferrari 312 P Coupe | North American Racing Team | 2:06.0000 |
| 14th | 34 | Jean-Pierre Beltoise / Henri Pescarolo | Matra-Simca MS650 | Matra Sports | 1:53.0000 |
| 15th | 52 | Tony Dean / Peter Gregg | Porsche 917 K | Tony Dean | 2:00.0000 |
| 16th | 8 | Bob Johnson / Robert R. Johnson / Jim Greendyke | Chevrolet Corvette | Forma Scientific | 2:07.0000 |
| 17th | 17 | Piers Forester / Andrew Hedges | Ford GT40 | Trevor Graham | 2:07.6000 |
| 18th | 91 | Allan Barker / John Greenwood / Richard Hoffman | Chevrolet Corvette | Auto Research Eng. | 2:08.0000 |
| 19th | 0 | Mark Donohue / Peter Revson | AMC Javelin | Roger Penske Racing | 2:08.4000 |
| 20th | 6 | Tony DeLorenzo / Dick Lang | Chevrolet Corvette C3 | Owens Corning Fibreglass | 2:08.5000 |
| 21st | 19 | Francis Grant / Ray Heppenstall / Buzz Marcus | Ford GT40 | Auto Enterprises of Chestnut | 2:08.8000 |
| 22nd | 37 | Brian Robinson / Hugh Kleinpeter / Fred Opert | Chevron B16 Ford | Fred Opert Racing/Chevron Cars | 2:09.2000 |
| 23rd | 11 | Larry Brock / Larry Dent | Chevrolet Camaro | Laurel Racing | 2:10.0000 |
| 24th | 9 | Don Yenko / Bob Grossman | Chevrolet Camaro I | Mamie Reynolds Gregory | 2:11.0000 |
| 25th | 16 | Jim Baker / Clive Baker | Chevron B16 Ford | Ring Free Racing Team | 2:12.1000 |
| 26th | 54 | Carlos Pairetti / Alain De Cadenet / Jorge Omar Del Río | Porsche 908/02 | Juan Manuel Fangio | 2:05.6000 |
| 27th | 90 | Or Costanzo / Dave Heinz | Chevrolet Corvette | Or Costanzo | 2:14.7000 |
| 28th | 96 | Vince Gimondo / Chuck Dietrich | Chevrolet Camaro Z/28 | Takondo Racing | 2:15.0000 |
| 29th | 12 | Bob Mitchell / Charlie Kemp | Chevrolet Camaro | Bob Mitchell | 2:15.7000 |
| 30th | 20 | Harley Cluxton / Gordon Tatum | Ferrari 275 GTB/C | North American Racing Team | 2:15.8000 |
| 31st | 22 | Ronnie Bucknum / Wilbur Pickett | Ferrari 365 GTB/4 | North American Racing Team | 2:16.0000 |
| 32nd | 66 | Ed Matthews / Don Sesslar / Al Weaver | Ford Mustang | H. Edward Mathews | 2:16.6000 |
| 33rd | 30 | Corrado Manfredini / Gianpiero Moretti | Ferrari 512 S | Squadra Picchio-Rosso | 2:19.0000 |
| 34th | 89 | Cliff Gottlob / Dave Dooley | Chevrolet Corvette | Cliff Gottlob | 2:09.3000 |
| 35th | 77 | Bruce Jennings / Bob Tullius | Porsche 911 T | Toad Hall Racing | 2:21.0000 |
| 36th | 47 | Jim Bandy / Fred Stevenson / Carl Williams | Lotus 47 | Sports Motors, Inc. | 2:23.0000 |
| 37th | 70 | James Patterson / Paul Sanford | Porsche 911 T | Sportade Racing Team | 2:23.0000 |
| 38th | 93 | Jim Harrell / Len Magnor | Ford Mustang | Redline Engineering, Inc. | 2:23.5000 |
| 39th | 74 | Ralph Meaney / Gary Wright / Bill Bean | Porsche 911 S | Ralph Meaney | 2:24.6000 |
| 40th | 72 | Jacques Duval / Bob Bailey | Porsche 911 T | Jacques Duval | 2:24.6000 |
| 41st | 18 | William Wonder / Ray Cuomo | Ford GT40 | William Wonder, Inc. | 2:24.7000 |
| 42nd | 46 | Claibourne Darden / Warren Matzen | Shelby GT350 | Jack Haywood | 2:26.0000 |
| 43rd | 40 | Gregg Loomis / Bert Everett | Porsche 906 E | Gregg Loomis | 2:26.6000 |
| 44th | 21 | Gregg Young / Luigi Chinetti, Jr. | Ferrari 250 LM | North American Racing Team | 2:26.7000 |
| 45th | 98 | Norberto Mastandrea / Smokey Drolet / Rajah Rodgers | Chevrolet Camaro I | Norberto Mastandrea | 2:26.8000 |
| 46th | 14 | Ray Cuomo / Bernard Gimbel / George Lisberg | Ford Mustang | Ray Cuomo Racing | 2:27.2000 |
| 47th | 73 | Bobby Rinzler / Charles Reynolds | Austin-Healey Sprite | Ring Free Racing Team | 2:29.0000 |
| 48th | 92 | Donna Mae Mims / Jim Corwin / Fred Pipen | Chevrolet Camaro Z/28 | Flem-Cor Enterprises | 2:30.4000 |
| 49th | 76 | Scotty Addison / Erhard Dahm | Porsche 911 S | Scotty Addison | 2:30.5000 |
| 50th | 97 | John Elliott / Don Gwynne | Chevrolet Camaro I Z/28 | Preston Hood Chevrolet | 2:31.0000 |
| 51st | 43 | William Harris / Robert E. Lewis | Austin-Healey Sprite | William Harris | 2:31.2000 |
| 52nd | 83 | Vincent Collins / Larry Wilson | Ford Mustang | Dr. Vince Collins | 2:32.0000 |
| 53rd | 71 | Ray Walle / Bob Speakman | TVR Vixen Ford | Walle Enterprises | 2:35.0000 |
| 54th | 84 | Walter Brown / Buzz Marcus / Jim Sandman | BMW 2002 | H.C.A.S., Inc. | 2:37.0000 |
| 55th | 78 | John Belperche / Tony Lilly / Don Pickett | MGB | Waldron Motors | 2:41.0000 |
| 56th | 79 | Chris Waldron / Lowell Lanier / Bill Barros | MGB | Waldron Motors | 2:43.6000 |
| 57th | 95 | Mike Brockman / John Tremblay | Chevrolet Camaro I Z/28 | Bruce Behrens Racing | 2:43.7000 |
| 58th | 15 | Ed Lowther / Bob Nagel | Chevrolet Camaro I | Bob Fryer | 2:16.1000 |
| 59th | 85 | Robert Whitaker / Richard Krebs / Harvey Eckoff | Volvo 122 S | Robert Whitaker | 2:45.1000 |
| 60th | 39 | Rainer Brezinka / Horst Petermann / Rudy Bartling | Porsche 906 | Rainer Brezinka | 2:45.9000 |
| 61st | 86 | Arthur Mollin / Art Riley | Volvo 122 S | Arthur Mollin Racing | 2:50.9000 |
| 62nd | 38 | Paul Fleming / Amos Johnson | Fiat 124 Sport coupé | Simone Fleming | 2:52.0000 |
| 63rd | 88 | Barry Batchin / Dieter Oest | Lancia Fulvia HF | Auto Enterprises of Chestnut | 2:56.0000 |
| 64th | 48 | Del Russo Taylor / Hank Sheldon | Alfa Romeo 1750 GTV | Del Taylor | 3:13.1000 |
| 65th | 55 | Don Kearney / Richard Roberts / Wayne Purdy | Datsun PL510 | Donald E. Kearney | 3:13.3000 |
| 66th | 94 | Don Cummings / Warren Stumes | Shelby GT350 | Susan T. Cummings | no time |