| 1st | 52 | Elford / Redman | Porsche 908L | Porsche System Engineering | 1:52.2000 | 196.7359 |
| 2nd | 6 | Donohue / Parsons / *Bucknum | Lola T70 Mk.3B GT Chevrolet | Roger Penske Racing | 1:52.7000 | |
| 3rd | 50 | Siffert / Herrmann | Porsche 908L | Porsche System Engineering | 1:53.4000 | |
| 4th | 54 | Stommelen / Ahrens, Jr. | Porsche 908L | Porsche System Engineering | 1:53.9000 | |
| 5th | 60 | Norinder / Bonnier / *Servoz-Gavin | Lola T70 Mk.3B GT Chevrolet | Sportscars Unlimited Switzerland | 1:54.0000 | |
| 6th | 51 | Attwood / Buzzetta | Porsche 908L | Porsche System Engineering | 1:54.4000 | |
| 7th | 53 | Schütz / Mitter / Attwood | Porsche 908L | Porsche System Engineering | 1:54.4000 | |
| 8th | 1 | Oliver / Ickx | Ford GT40 | J. W. Automotive Eng. | 1:54.5000 | |
| 9th | 2 | Hobbs / Hailwood | Ford GT40 | J. W. Automotive Eng. | 1:55.3000 | |
| 10th | 9 | Patrick / Jordan | Lola T70 Mk.3 GT Chevrolet | American International Racing | 1:57.3000 | |
| 11th | 8 | Leslie / Motschenbacher | Lola T70 Mk.3 GT Chevrolet | American International Racing | 1:57.3000 | |
| 12th | 58 | Soler-Roig / Lins | Porsche 907 2.2 | Escuderia Nacional CS | 2:00.3000 | |
| 13th | 66 | DeLorenzo / Lang | Chevrolet Corvette Sting Ray | Owens-Corning Fiberglass Troy Promotions | 2:03.2000 | |
| 14th | 61 | Gregory / Broström | Porsche 910 | Sportscars Unlimited Switzerland | 2:04.7000 | |
| 15th | 67 | Thompson / Harrell / DeLorenzo | Chevrolet Corvette Sting Ray | Owens-Corning Fiberglass Troy Promotions | 2:04.8000 | |
| 16th | 26 | Titus / Ward | Pontiac Firebird | Jon Ward Racing Ent. | 2:07.7000 | |
| 17th | 92 | Jowett, Jr. / Fisher | Chevrolet Camaro | Wilton T. Jowett, Sr. | 2:07.8000 | |
| 18th | 40 | Kolb / Biscaldi | Ferrari Dino 206 S | North American Racing Team | 2:08.4000 | |
| 19th | 11 | Yenko / Guldstrand | Chevrolet Camaro | Best Photo Serv. Inc. | 2:09.6000 | |
| 20th | 25 | Dibos / Calabattisti | Alfa Romeo T33/2 2.5 | Dibos Ch. | 2:09.6000 | |
| 21st | 5 | Grossman / Dini | Chevrolet Camaro | Randy's Auto Body | 2:10.5000 | |
| 22nd | 39 | Kleinpeter / Gunn / Beatty | Chevron B8 BMW | Raceco of Miami | 2:13.4000 | |
| 23rd | 33 | McComb / Dooley | Ford Mustang | John McComb Racing | 2:13.8000 | |
| 24th | 62 | Bartling / Hochreuter / Brezinka / *Petermann | Porsche 906 | Rainer Brezinka | 2:14.2000 | |
| 25th | 19 | Buckley / Cooper | Mercury Cougar | Bud Moore | 2:14.8000 | |
| 26th | 41 | Posey / Rodriguez | Ferrari 275 GTB/C | North American Racing Team | 2:15.3000 | |
| 27th | 15 | Bock / Dent | Chevrolet Camaro | Larry Drover | 2:15.4000 | |
| 28th | 20 | Adamowicz / Jennings / Wetanson | Porsche 911 T | P.A.R.T. | 2:17.8000 | |
| 29th | 14 | Everett / Johnson / Coleman | Porsche 911 | Fine Grinding Co. | 2:18.2000 | |
| 30th | 59 | Gregg / Axelsson | Porsche 911 | Brumos Porsche | 2:19.0000 | |
| 31st | 68 | Duval / Nicholas / *Samson | Porsche 911 T/R | Jacques Duval | 2:19.4000 | |
| 32nd | 18 | Carter / Adams | Chevrolet Camaro | Maurice Carter Chevrolet | 2:19.8000 | |
| 33rd | 43 | Wright / Craine | Porsche 911 | Gary Wright | 2:19.9000 | |
| 34th | 47 | Williamson / Drolsom | Porsche 911 | Dr. Harold Williamson | 2:22.0000 | |
| 35th | 86 | Harrison / Ryan | Porsche 911 | RBM Motors | 2:22.1000 | |
| 36th | 48 | Wicky / Garant | Porsche 911 T | Wicky Racing Team | 2:22.3000 | |
| 37th | 28 | Corwin / Manner / Baird | Chevrolet Camaro | Flem-Cor Ent. | 2:22.4000 | |
| 38th | 36 | Pickett / Downs / *Tullius | Porsche 911 | Dr. Wilbur Pickett | 2:22.6000 | |
| 39th | 21 | Netterstrom / Kelly | Porsche 911 | P.A.R.T. | 2:22.6000 | |
| 40th | 32 | Rose / Richards / *Hill | Chevrolet Camaro | Harold Rose | 2:22.6000 | |
| 41st | 91 | Mastandrea / Silvers / Ormes | Chevrolet Camaro | Mar Shipping Co. | 2:23.0000 | |
| 42nd | 72 | Hagan / McVeigh / Gillebard | Mercury Cougar | Lafayette Speed Center | 2:23.2000 | |
| 43rd | 17 | McClain / Costanzo | Chevrolet Camaro | David H. McClain | 2:23.2000 | |
| 44th | 16 | Rafferty / Gearhart / Wisler | Chevrolet Corvette | Rafferty Racing | 2:23.4000 | |
| 45th | 97 | Maglioli / Pinto | Lancia Fulvia HF Zagato | Algar Enterprises | 2:24.0000 | |
| 46th | 77 | Gifford / Campbell | Porsche 911 | Williams Racing Ent. | 2:24.2000 | |
| 47th | 22 | Bailey / Locke / Downs | Porsche 911 | P.A.R.T. | 2:25.0000 | |
| 48th | 96 | Drolet / Tremblay / Gimondo / Belperche | Chevrolet Corvette | Zorian Productions, Ltd. | 2:25.0000 | |
| 49th | 99 | Robson / Rodgers | Jaguar XKE | Coguna Motors | 2:25.2000 | |
| 50th | 38 | Merello / Maglioli / Alvarez | Ferrari 250 LM | Team Raceco of Miami | 2:25.6000 | |
| 51st | 73 | Opert / Sanford | Porsche 911 | Fred Opert Racing | 2:26.4000 | |
| 52nd | 4 | McDaniel / Pieper / Scott | Zink VSR Volkswagen | HRH Corp. | 2:32.4000 | |
| 53rd | 55 | Gammon / Mummery / *Smith | MGB | Waldron Motors | 2:33.2000 | |
| 54th | 56 | Harris / Waldron / Scott | MGB | Waldron Motors | 2:34.3000 | |
| 55th | 81 | Pryor / Marina | Alfa Romeo Giulia SS | Auto of Italy, Inc. | 2:44.9000 | |
| 56th | 46 | Debo / Parkerson | Triumph TR4 | Bud Boles Racing | 2:45.2000 | |
| 57th | 57 | Heinz / Moerwald | MGB | David Heinz Imports | 2:45.6000 | |
| 58th | 79 | Riley / Mollin | Volvo 122 S | Arthur Mollin Racing | 2:49.2000 | |
| 59th | 98 | Hollander / Clark / Marsula | Lancia Fulvia HF Zagato | Algar Enterprises | 2:51.6000 | |
| 60th | 88 | Grant / Oest / Batchin | Lancia Fulvia HF | Auto Enterprise of ChestnutHills | 2:54.0000 | |
| 61st | 69 | Lowther / Esseks / Dominianni | Chevrolet Corvette | Robert D. Esseks | no time | |
| 62nd | 89 | James Hall | Dodge Dart | LeVerne Hartje | no time | |
| 63rd | 83 | Baker / Baker / Richards | Austin-Healey Sprite | MacMillan Ring Free | no time | |
| 64th | 7 | *Wonder / *Cuomo | Ford GT40 | William Wonder, Inc. | no time | |
| 65th | 45 | Waltman / Bird | Osca GT2 Maserati | Scuderia Autosport | no time | |
| 66th | 93 | Cline / Pickering | Triumph GT6 | Richard Cline | no time | |