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