| 1st | 52 | Vic Elford / Brian Redman | Porsche 908L | Porsche System Engineering | 1:52.2000 |
| 2nd | 6 | Mark Donohue / Chuck Parsons | Lola T70 Mk.3B GT Chevrolet | Roger Penske Racing | 1:52.7000 |
| 3rd | 50 | Jo Siffert / Hans Herrmann | Porsche 908L | Porsche System Engineering | 1:53.4000 |
| 4th | 54 | Rolf Stommelen / Kurt Ahrens, Jr. | Porsche 908L | Porsche System Engineering | 1:53.9000 |
| 5th | 60 | Ulf Norinder / Jo Bonnier | Lola T70 Mk.3B GT Chevrolet | Sportscars Unlimited Switzerland | 1:54.0000 |
| 6th | 51 | Richard Attwood / Joe Buzzetta | Porsche 908L | Porsche System Engineering | 1:54.4000 |
| 7th | 53 | Udo Schütz / Gerhard Mitter / Richard Attwood | Porsche 908L | Porsche System Engineering | 1:54.4000 |
| 8th | 1 | Jackie Oliver / Jacky Ickx | Ford GT40 | J. W. Automotive Eng. | 1:54.5000 |
| 9th | 2 | David Hobbs / Mike Hailwood | Ford GT40 | J. W. Automotive Eng. | 1:55.3000 |
| 10th | 9 | Scooter Patrick / Dave Jordan | Lola T70 Mk.3 GT Chevrolet | American International Racing | 1:57.3000 |
| 11th | 8 | Ed Leslie / Lothar Motschenbacher | Lola T70 Mk.3 GT Chevrolet | American International Racing | 1:57.3000 |
| 12th | 58 | Alex Soler-Roig / Rudi Lins | Porsche 907 2.2 | Escuderia Nacional CS | 2:00.3000 |
| 13th | 66 | Tony DeLorenzo / Dick Lang | Chevrolet Corvette Sting Ray | Owens-Corning Fiberglass Troy Promotions | 2:03.2000 |
| 14th | 61 | Masten Gregory / Richard Broström | Porsche 910 | Sportscars Unlimited Switzerland | 2:04.7000 |
| 15th | 67 | Jerry Thompson / Jim Harrell / Tony DeLorenzo | Chevrolet Corvette Sting Ray | Owens-Corning Fiberglass Troy Promotions | 2:04.8000 |
| 16th | 26 | Jerry Titus / Jon Ward | Pontiac Firebird | Jon Ward Racing Ent. | 2:07.7000 |
| 17th | 92 | Wilton T. Jowett, Jr. / Craig Fisher | Chevrolet Camaro | Wilton T. Jowett, Sr. | 2:07.8000 |
| 18th | 40 | Charlie Kolb / Giampiero Biscaldi | Ferrari Dino 206 S | North American Racing Team | 2:08.4000 |
| 19th | 11 | Don Yenko / Dick Guldstrand | Chevrolet Camaro | Best Photo Serv. Inc. | 2:09.6000 |
| 20th | 25 | Eduardo Dibos / Mario Colabattisti | Alfa Romeo T33/2 2.5 | Dibos Ch. | 2:09.6000 |
| 21st | 5 | Bob Grossman / Bob Dini | Chevrolet Camaro | Randy's Auto Body | 2:10.5000 |
| 22nd | 39 | Hugh Kleinpeter / John Gunn / Bob Beatty | Chevron B8 BMW | Raceco of Miami | 2:13.4000 |
| 23rd | 33 | John McComb / Dave Dooley | Ford Mustang | John McComb Racing | 2:13.8000 |
| 24th | 62 | Rudy Bartling / Fritz Hochreuter / Rainer Brezinka | Porsche 906 | Rainer Brezinka | 2:14.2000 |
| 25th | 19 | Charles Buckley / L. Gordon Cooper | Mercury Cougar | Bud Moore | 2:14.8000 |
| 26th | 41 | Sam Posey / Ricardo Rodriguez | Ferrari 275 GTB/C | North American Racing Team | 2:15.3000 |
| 27th | 15 | Larry Bock / Larry Dent | Chevrolet Camaro | Larry Drover | 2:15.4000 |
| 28th | 20 | Tony Adamowicz / Bruce Jennings / Herb Wetanson | Porsche 911 T | P.A.R.T. | 2:17.8000 |
| 29th | 14 | Bert Everett / Alan Johnson / Lin Coleman | Porsche 911 | Fine Grinding Co. | 2:18.2000 |
| 30th | 59 | Peter Gregg / Sten Axelsson | Porsche 911 | Brumos Porsche | 2:19.0000 |
| 31st | 68 | Jacques Duval / George Nicholas | Porsche 911 T/R | Jacques Duval | 2:19.4000 |
| 32nd | 18 | Maurice Carter / Nat Adams | Chevrolet Camaro | Maurice Carter Chevrolet | 2:19.8000 |
| 33rd | 43 | Gary Wright / Bill Craine | Porsche 911 | Gary Wright | 2:19.9000 |
| 34th | 47 | Harold Williamson / George Drolsom | Porsche 911 | Dr. Harold Williamson | 2:22.0000 |
| 35th | 86 | Pete Harrison / Jack Ryan | Porsche 911 | RBM Motors | 2:22.1000 |
| 36th | 48 | André Wicky / Sylvain Garant | Porsche 911 T | Wicky Racing Team | 2:22.3000 |
| 37th | 28 | Jim Corwin / Mike Manner / Carson Baird | Chevrolet Camaro | Flem-Cor Ent. | 2:22.4000 |
| 38th | 36 | Wilbur Pickett / Mike Downs | Porsche 911 | Dr. Wilbur Pickett | 2:22.6000 |
| 39th | 21 | Jim Netterstrom / John Kelly | Porsche 911 | P.A.R.T. | 2:22.6000 |
| 40th | 32 | Harold Rose / Mike Richards | Chevrolet Camaro | Harold Rose | 2:22.6000 |
| 41st | 91 | Norberto Mastandrea / Doug Silvers / Robin Ormes | Chevrolet Camaro | Mar Shipping Co. | 2:23.0000 |
| 42nd | 72 | Billy Hagan / John McVeigh / Francis Gillebard | Mercury Cougar | Lafayette Speed Center | 2:23.2000 |
| 43rd | 17 | David McClain / Or Costanzo | Chevrolet Camaro | David H. McClain | 2:23.2000 |
| 44th | 16 | F. P. Wedge Rafferty / Jack Gearhart / Dick Wisler | Chevrolet Corvette | Rafferty Racing | 2:23.4000 |
| 45th | 97 | Claudio Maglioli / Raffaele Pinto | Lancia Fulvia HF Zagato | Algar Enterprises | 2:24.0000 |
| 46th | 77 | Marty Gifford / Bill Campbell | Porsche 911 | Williams Racing Ent. | 2:24.2000 |
| 47th | 22 | Bob Bailey / Jim Locke / Mike Downs | Porsche 911 | P.A.R.T. | 2:25.0000 |
| 48th | 96 | Smokey Drolet / John Tremblay / Vince Gimondo / John Belperche | Chevrolet Corvette | Zorian Productions, Ltd. | 2:25.0000 |
| 49th | 99 | Richard Robson / Rajah Rodgers | Jaguar XKE | Coguna Motors | 2:25.2000 |
| 50th | 38 | Fausto Merello / Umberto Maglioli / Eddie Alvarez | Ferrari 250 LM | Team Raceco of Miami | 2:25.6000 |
| 51st | 73 | Fred Opert / Paul Sanford | Porsche 911 | Fred Opert Racing | 2:26.4000 |
| 52nd | 4 | Jim McDaniel / Steve Pieper / Bill Scott | Zink VSR Volkswagen | HRH Corp. | 2:32.4000 |
| 53rd | 55 | Jim Gammon / Ray Mummery | MGB | Waldron Motors | 2:33.2000 |
| 54th | 56 | Thomas D. Harris / Chris Waldron / Ben Scott | MGB | Waldron Motors | 2:34.3000 |
| 55th | 81 | Bill Pryor / José Marina | Alfa Romeo Giulia SS | Auto of Italy, Inc. | 2:44.9000 |
| 56th | 46 | John Debo / E. M. Parkerson | Triumph TR4 | Bud Boles Racing | 2:45.2000 |
| 57th | 57 | Dave Heinz / Jerry Moerwald | MGB | David Heinz Imports | 2:45.6000 |
| 58th | 79 | Art Riley / Arthur Mollin | Volvo 122 S | Arthur Mollin Racing | 2:49.2000 |
| 59th | 98 | Bruce Hollander / Robert Clark / Wayne Marsula | Lancia Fulvia HF Zagato | Algar Enterprises | 2:51.6000 |
| 60th | 88 | Francis Grant / Dieter Oest / Barry Batchin | Lancia Fulvia HF | Auto Enterprise of ChestnutHills | 2:54.0000 |
| 61st | 69 | Ed Lowther / Robert D. Esseks / Frank Dominianni | Chevrolet Corvette | Robert D. Esseks | no time |
| 62nd | 89 | James Hall | Dodge Dart | LeVerne Hartje | no time |
| 63rd | 83 | Jim Baker / Clive Baker / Paul Richards | Austin-Healey Sprite | MacMillan Ring Free | no time |
| 64th | 7 | | Ford GT40 | William Wonder, Inc. | no time |
| 65th | 45 | George Waltman / Wallis Bird | Osca GT2 Maserati | Scuderia Autosport | no time |
| 66th | 93 | Rick Cline / Michael Pickering | Triumph GT6 | Richard Cline | no time |