| 1st | 49 | Siffert / Herrmann | Porsche 907 2.2 | Porsche Automobile Co. | 2:49.4000 | 177.8454 |
| 2nd | 28 | Ickx / Redman | Ford GT40 | J. W. Engineering | 2:50.4000 | |
| 3rd | 76 | Thompson / Lowther / Heppenstall | Howmet TX Continental | Howmet Corporation | 2:50.6000 | |
| 4th | 9 | Patrick / Jordan | Lola T70 Mk.3 GT Chevrolet | American International | 2:50.8000 | |
| 5th | 48 | Mitter / Stommelen | Porsche 907 2.2 | Porsche Automobile Co. | 2:50.8000 | |
| 6th | 51 | Elford / Neerpasch | Porsche 907 2.2 | Porsche Automobile Co. | 2:51.4000 | |
| 7th | 29 | Hawkins / Hobbs | Ford GT40 | J. W. Engineering | 2:51.6000 | |
| 8th | 50 | Scarfiotti / Buzzetta / *Neerpasch | Porsche 907 2.2 | Porsche Automobile Co. | 2:51.8000 | |
| 9th | 11 | De Udy / Dibley | Lola T70 Mk.3 GT Chevrolet | Mike de 'Udy | 2:52.8000 | |
| 10th | 10 | Bonnier / Axelsson | Lola T70 Mk.3 GT Chevrolet | Ecurie Bonnier | 2:54.4000 | |
| 11th | 30 | Piper / Nelson | Ford GT40 | Edward Nelson Racing | 2:59.0000 | |
| 12th | 42 | Bianchi / Grandsire | Alpine A211 Renault | Societé Alpine | 3:00.4000 | |
| 13th | 15 | Donohue / Fisher | Chevrolet Camaro | Roger Penske Racing | 3:01.2000 | |
| 14th | 81 | Unser / Ruby | Chevrolet Camaro | Samadco Ltd. (Smokey Yunick) | 3:01.2000 | |
| 15th | 58 | Steinemann / Spoerry | Porsche 910 | Squadra Tartaruga | 3:02.4000 | |
| 16th | 31 | Titus / Bucknum | Ford Mustang | Shelby Racing | 3:02.6000 | |
| 17th | 16 | Fisher / Welch / Johnson | Chevrolet Camaro | Roger Penske Racing | 3:02.7000 | |
| 18th | 56 | Foitek / Lins | Porsche 910 | Valvoline Oil Company | 3:03.0000 | |
| 19th | 2 | Rodriguez / Yenko | Chevrolet Corvette | Sunray DX Oil Company | 3:04.0000 | |
| 20th | 25 | Follmer / Grant / Scott / *Martin | AMC Javelin | Javelin Racing Team | 3:04.4000 | |
| 21st | 39 | Merello / Ortega / Gunn | Ferrari 250 LM | Raceco | 3:05.6000 | |
| 22nd | 32 | Moffat / Kwech / *Follmer | Ford Mustang | Shelby Racing | 3:06.6000 | |
| 23rd | 4 | Thompson / DeLorenzo / *Dooley | Chevrolet Corvette | Sunray DX Oil Company | 3:07.2000 | |
| 24th | 24 | Revson / Scott / *Martin | AMC Javelin | Javelin Racing Team | 3:07.2000 | |
| 25th | 64 | Bailey / Locke | Porsche 906 | B.& B. Motors | 3:08.4000 | |
| 26th | 55 | Capriles / Atencio | Porsche 906 E | Raceco | 3:09.0000 | |
| 27th | 3 | Sharp / Morgan / *Ausburn / *Dooley | Chevrolet Corvette | Sunray DX Oil Company | 3:09.2000 | |
| 28th | 23 | Jennings / Rainville / *Pettey | Mercury Cougar | Squadra Course Verona | 3:12.0000 | |
| 29th | 36 | Novoa / van Beuren, Jr. / *Perez Gama | Ford Mustang | Dos Caballos Racing | 3:13.0000 | |
| 30th | 80 | Torpy / Keenan | Chevrolet Corvette | William H. Laughlin | 3:13.8000 | |
| 31st | 37 | Wintersteen / Starr | Ford Mustang | Starr Racing | 3:14.6000 | |
| 32nd | 12 | Jowett, Jr. / Cardwell | Chevrolet Camaro | Wilton T. Jowett, Sr. | 3:16.0000 | |
| 33rd | 34 | Posey / Minter | Ford Mustang | Mathews Racing Team | 3:16.1000 | |
| 34th | 8 | Motschenbacher / Leslie / Guldstrand | Lola T70 Mk.3 GT Chevrolet | American International | 3:16.4000 | |
| 35th | 69 | Hugus / Dietrich | Lotus 47 BMW | Elsco BMW | 3:16.4000 | |
| 36th | 33 | McComb / Richards / *Tullius / *Dooley | Ford Mustang | John McComb | 3:17.0000 | |
| 37th | 59 | Kirby / Johnson | Porsche 911 S | Don Burns V.W. | 3:19.6000 | |
| 38th | 7 | Costanzo / Harris / Heinz | Chevrolet Corvette | Slaton Chevrolet | 3:20.0000 | |
| 39th | 47 | Dittemore / Tullius / *Rothschild | Triumph TR250 K | Leyland Motor Corporation | 3:20.2000 | |
| 40th | 60 | Harrison / Loomis / Ryan | Porsche 911 S | Gregg Loomis | 3:20.6000 | |
| 41st | 17 | Chitwood / Horchler / Hoffman | Chevrolet Camaro | Joie Chitwood, Jr. | 3:21.4000 | |
| 43rd | 20 | McClain / Boo | Chevrolet Camaro | Padrick Chevrolet | 3:24.2000 | |
| 44th | 18 | Corwin / Pipin | Chevrolet Camaro | James Corwin | 3:24.8000 | |
| 45th | 35 | Grossman / Dini | Ford Mustang | Randy's Auto Body | 3:25.2000 | |
| 46th | 63 | Greger / Huth | Porsche 911 S | Sepp Greger | 3:25.2000 | |
| 47th | 61 | Duval / Kroll | Porsche 911 S | Jacques Duval | 3:26.8000 | |
| 48th | 68 | Sylvia / Domizi / Fogle | Lotus 47 | Dyno Racing | 3:26.8000 | |
| 49th | 44 | Hopkirk / Hedges | MGC | British Motor Company | 3:27.0000 | |
| 50th | 73 | Baker / Garton | Austin-Healey Sprite | Donald Healey Motor Co. LTD. | 3:28.0000 | |
| 51st | 22 | Hagan / McVeigh / Gillebard | Mercury Cougar | Billy Hagan | 3:28.4000 | |
| 52nd | 14 | Mastandrea / Noseda | Chevrolet Camaro | Mar Shipping | 3:28.6000 | |
| 53rd | 27 | Kleinpeter / Hollander / Mummery | Shelby GT350 | Port of Entry Motors | 3:29.8000 | |
| 54th | 71 | Maglioli / Everett / Andersson | Lancia Fulvia HF Zagato Proto | H.F. Squadra (Algar Enterprises) | 3:30.6000 | |
| 55th | 62 | Hanrioud / Garant | Porsche 911 S | Jean Pierre Hanrioud | 3:31.2000 | |
| 42nd | 19 | Murphy / Moore | Chevrolet Camaro | H.R.H. Corporation | 3:32.0000 | |
| 56th | 21 | Yuma / Boye | Chevrolet Camaro | Bill Boyé Racing | 3:32.4000 | |
| 57th | 38 | Favreau / Amiot | Ford Mustang | Gagnon Spring, Inc. | 3:33.2000 | |
| 58th | 72 | Pinto / Taramazzo / Maglioli | Lancia Fulvia HF | H.F. Squadra (Algar Enterprises) | 3:34.4000 | |
| 59th | 74 | Truitt / Canfield | MG Midget | Donald Healey Motor Co. LTD. | 3:41.0000 | |
| 60th | 85 | Mims / Summers | Yenko Stinger | Best Sports Cars | 3:42.9000 | |
| 61st | 84 | Rodgers / Robson / *Buchman | Jaguar E-type | Coquina Motors | 3:43.0000 | |
| 62nd | 67 | Gammon / Waldron / Scott | MGB | Waldron Motors | 3:44.0000 | |
| 63rd | 93 | Mollin / Riley / Cone | TVR Grantura 1800 S | Arthur Mollin Racing | 3:45.2000 | |
| 64th | 86 | Witt / Vega / Cameron | Triumph TR4A | John Cameron | 3:46.6000 | |
| 65th | 66 | Rodrigues / McDaniel / Brack | MGB GT | British Motor Company | 3:56.2000 | |
| 66th | 95 | Cohn / Pickett / Lilly | Beach Prototype Volkswagen | Arthur Cohn | 3:57.6000 | |
| 67th | 52 | Cline / Pickering | Triumph GT6 | Richard P. Cline | 4:00.0000 | |
| 68th | 26 | Guthrie / Engeman | AMC Javelin | G.& H. Engineering (Ring-Free Racing Team) | 4:03.2000 | |
| 71st | 96 | Kondracki / Andrews, Jr. | Triumph Spitfire | Richard P. Cline | 4:24.5000 | |
| 69th | 57 | McDaniel / Sullivan | Porsche 911 R | H.R.H. Engineering | no time | |
| 70th | 70 | Nearburg / Jett | Lotus 47 BMW | Elsco BMW | no time | |