| 1st | 1 | Siffert / Redman | Porsche 917 K | J. W. Engineering | 1:48.700 | 1:52.9000 |
| 2nd | 28 | Andretti / Merzario / Ickx | Ferrari 512 S | Ferrari s.p.a. | 1:51.600 | 1:51.6000 |
| 3rd | 34 | Beltoise / Pescarolo | Matra-Simca MS650 | Matra Sports | 1:53.000 | 1:53.0000 |
| 4th | 2 | Rodriguez / Kinnunen / Redman | Porsche 917 K | J. W. Engineering | 1:55.800 | 1:55.8000 |
| 5th | 3 | Ahrens, Jr. / Elford | Porsche 917 K | Porsche Konstruktionen KG | 1:56.100 | 1:56.1000 |
| 6th | 27 | Schetty / Ickx | Ferrari 512 S | Ferrari s.p.a. | 1:56.900 | 1:56.9000 |
| 7th | 25 | Gurney / Parsons | Ferrari 512 S | North American Racing Team | 1:57.800 | 1:57.8000 |
| 8th | 33 | Cevert / Brabham | Matra-Simca MS650 | Matra Sports | 1:58.700 | 1:58.7000 |
| 9th | 26 | Vaccarella / Giunti | Ferrari 512 S | Ferrari s.p.a. | 1:59.000 | 1:59.0000 |
| 10th | 52 | Dean / Gregg | Porsche 917 K | Tony Dean | 2:00.000 | 2:00.0000 |
| 11th | 24 | Posey / Parkes | Ferrari 312 P Coupe | North American Racing Team | 2:02.400 | 2:02.4000 |
| 12th | 5 | Cannon / Eaton | Lola T70 Mk.3B GT Chevrolet | Randy's Auto Body Service | 2:03.800 | 2:03.8000 |
| 13th | 7 | Thompson / Mahler | Chevrolet Corvette C3 | Owens Corning Fibreglass | 2:04.600 | 2:04.6000 |
| 14th | 53 | Laine / van Lennep | Porsche 908/02 | Racing Team AAW | 2:05.200 | 2:05.2000 |
| 15th | 54 | Pairetti / De Cadenet / Del Río | Porsche 908/02 | Juan Manuel Fangio | 2:05.600 | 2:05.6000 |
| 16th | 23 | Adamowicz / Piper | Ferrari 312 P Coupe | North American Racing Team | 2:06.000 | 2:06.0000 |
| 17th | 8 | Johnson / Johnson / Greendyke | Chevrolet Corvette | Forma Scientific | 2:07.000 | 2:07.0000 |
| 18th | 17 | Forester / Hedges | Ford GT40 | Trevor Graham | 2:07.600 | 2:07.6000 |
| 19th | 91 | Barker / Greenwood / Hoffman | Chevrolet Corvette | Auto Research Eng. | 2:08.000 | 2:08.0000 |
| 20th | 0 | Donohue / Revson | AMC Javelin | Roger Penske Racing | 2:08.400 | 2:08.4000 |
| 21st | 6 | DeLorenzo / Lang | Chevrolet Corvette C3 | Owens Corning Fibreglass | 2:08.500 | 2:08.5000 |
| 22nd | 19 | Grant / Heppenstall / Marcus | Ford GT40 | Auto Enterprises of Chestnut | 2:08.800 | 2:08.8000 |
| 23rd | 37 | Robinson / Kleinpeter / Opert | Chevron B16 Ford | Fred Opert Racing/Chevron Cars | 2:09.200 | 2:09.2000 |
| 24th | 89 | Gottlob / Dooley | Chevrolet Corvette | Cliff Gottlob | 2:09.300 | 2:09.3000 |
| 25th | 11 | Brock / Dent | Chevrolet Camaro | Laurel Racing | 2:10.000 | 2:10.0000 |
| 26th | 9 | Yenko / Grossman | Chevrolet Camaro I | Mamie Reynolds Gregory | 2:11.000 | 2:11.0000 |
| 27th | 16 | Baker / Baker / *Richards | Chevron B16 Ford | Ring Free Racing Team | 2:12.100 | 2:12.1000 |
| 28th | 90 | Costanzo / Heinz | Chevrolet Corvette | Or Costanzo | 2:14.700 | 2:14.7000 |
| 29th | 96 | Gimondo / Dietrich | Chevrolet Camaro Z/28 | Takondo Racing | 2:15.000 | 2:15.0000 |
| 30th | 12 | Mitchell / Kemp | Chevrolet Camaro | Bob Mitchell | 2:15.700 | 2:15.7000 |
| 31st | 20 | Cluxton / Tatum | Ferrari 275 GTB/C | North American Racing Team | 2:15.800 | 2:15.8000 |
| 32nd | 22 | Bucknum / Pickett | Ferrari 365 GTB/4 | North American Racing Team | 2:16.000 | 2:16.0000 |
| 33rd | 15 | Lowther / Nagel / *Fryer | Chevrolet Camaro I | Bob Fryer | 2:16.100 | 2:16.1000 |
| 34th | 66 | Matthews / Sesslar / Weaver | Ford Mustang | H. Edward Mathews | 2:16.600 | 2:16.6000 |
| 35th | 30 | Manfredini / Moretti | Ferrari 512 S | Squadra Picchio-Rosso | 2:19.000 | 2:19.0000 |
| 36th | 77 | Jennings / Tullius | Porsche 911 T | Toad Hall Racing | 2:21.000 | 2:21.0000 |
| 37th | 10 | Hewitt / Ledwith | Chevrolet Camaro I | Hewitt Racing | 2:21.100 | 2:21.1000 |
| 38th | 47 | Bandy / Stevenson / Williams | Lotus 47 | Sports Motors, Inc. | 2:23.000 | 2:23.0000 |
| 39th | 70 | Patterson / Sanford | Porsche 911 T | Sportade Racing Team | 2:23.000 | 2:23.0000 |
| 40th | 93 | Harrell / Magnor | Ford Mustang | Redline Engineering, Inc. | 2:23.500 | 2:23.5000 |
| 41st | 72 | Duval / Bailey | Porsche 911 T | Jacques Duval | 2:24.600 | 2:24.6000 |
| 42nd | 74 | Meaney / Wright / Bean | Porsche 911 S | Ralph Meaney | 2:24.600 | 2:24.6000 |
| 43rd | 51 | Fernandez / Juncadella | Porsche 908/02 | Escuderia Montjuich | 2:24.600 | 2:24.6000 |
| 44th | 18 | Wonder / Cuomo | Ford GT40 | William Wonder, Inc. | 2:24.700 | 2:24.7000 |
| 45th | 46 | Darden / Matzen | Shelby GT350 | Jack Haywood | 2:26.000 | 2:26.0000 |
| 46th | 40 | Loomis / Everett / *Harrison | Porsche 906 E | Gregg Loomis | 2:26.600 | 2:26.6000 |
| 47th | 21 | Young / Chinetti, Jr. | Ferrari 250 LM | North American Racing Team | 2:26.700 | 2:26.7000 |
| 48th | 98 | Mastandrea / Drolet / Rodgers | Chevrolet Camaro I | Norberto Mastandrea | 2:26.800 | 2:26.8000 |
| 49th | 14 | Cuomo / Gimbel / Lisberg | Ford Mustang | Ray Cuomo Racing | 2:27.200 | 2:27.2000 |
| 50th | 73 | Rinzler / Reynolds | Austin-Healey Sprite | Ring Free Racing Team | 2:29.000 | 2:29.0000 |
| 51st | 92 | Mims / Corwin / Pipen | Chevrolet Camaro Z/28 | Flem-Cor Enterprises | 2:30.400 | 2:30.4000 |
| 52nd | 76 | Addison / Dahm | Porsche 911 S | Scotty Addison | 2:30.500 | 2:30.5000 |
| 53rd | 97 | Elliott / Gwynne | Chevrolet Camaro I Z/28 | Preston Hood Chevrolet | 2:31.000 | 2:31.0000 |
| 54th | 43 | Harris / Lewis | Austin-Healey Sprite | William Harris | 2:31.200 | 2:31.2000 |
| 55th | 83 | Collins / Wilson | Ford Mustang | Dr. Vince Collins | 2:32.000 | 2:32.0000 |
| 56th | 75 | Hochreuter / Bytzek | Porsche 911 | Friedrich Hochreuter | 2:33.000 | 2:33.0000 |
| 57th | 71 | Walle / Speakman | TVR Vixen Ford | Walle Enterprises | 2:35.000 | 2:35.0000 |
| 58th | 84 | Brown / Marcus / Sandman | BMW 2002 | H.C.A.S., Inc. | 2:37.000 | 2:37.0000 |
| 59th | 78 | Belperche / Lilly / Pickett | MGB | Waldron Motors | 2:41.000 | 2:41.0000 |
| 60th | 79 | Waldron / Lanier / Barros | MGB | Waldron Motors | 2:43.600 | 2:43.6000 |
| 61st | 95 | Brockman / Tremblay | Chevrolet Camaro I Z/28 | Bruce Behrens Racing | 2:43.700 | 2:43.7000 |
| 62nd | 85 | Whitaker / Krebs / Eckoff | Volvo 122 S | Robert Whitaker | 2:45.100 | 2:45.1000 |
| 63rd | 39 | Brezinka / Petermann / Bartling | Porsche 906 | Rainer Brezinka | 2:45.900 | 2:45.9000 |
| 64th | 86 | Mollin / Riley | Volvo 122 S | Arthur Mollin Racing | 2:50.900 | 2:50.9000 |
| 65th | 38 | Fleming / Johnson | Fiat 124 Sport coupé | Simone Fleming | 2:52.000 | 2:52.0000 |
| 66th | 88 | Batchin / Oest | Lancia Fulvia HF | Auto Enterprises of Chestnut | 2:56.000 | 2:56.0000 |
| 67th | 48 | Taylor / Sheldon | Alfa Romeo 1750 GTV | Del Taylor | 3:13.100 | 3:13.1000 |
| 68th | 55 | Kearney / Roberts / Purdy | Datsun PL510 | Donald E. Kearney | 3:13.300 | 3:13.3000 |