| 1st | 1 | Bruce McLaren / Mario Andretti | Ford Mk IV | Ford Motor Company | 2:48.0000 |
| 2nd | 6 | Mike Spence / Jim Hall | Chaparral 2F Chevrolet | Chaparral Cars | 2:50.6000 |
| 3rd | 2 | A. J. Foyt / Lloyd Ruby | Ford Mk IIB | Ford Motor Company | 2:53.6000 |
| 4th | 5 | Bob Johnson / Bruce Jennings | Chaparral 2D Chevrolet | Chaparral Cars | 2:53.8000 |
| 5th | 11 | Dick Thompson / Ed Lowther | Ford GT40 | J. W. Engineering, Ltd. | 2:56.0000 |
| 6th | 20 | David Piper / Richard Attwood | Ferrari 365 P2/3 | David Piper Racing | 2:57.2000 |
| 7th | 44 | Charlie Kolb / Fred Baker / Lee Cutler | Porsche 906 | Baker Racing Team | 2:58.8000 |
| 8th | 19 | Nino Vaccarella / Umberto Maglioli | Ford GT40 | Brescia Corse Team | 2:59.4000 |
| 9th | 65 | Andrea de Adamich / Teodoro Zeccoli | Alfa Romeo T33 | Autodelta | 3:00.6000 |
| 10th | 37 | Jo Siffert / Hans Herrmann | Porsche 910 | Porsche Auto | 3:01.0000 |
| 11th | 36 | Scooter Patrick / Gerhard Mitter | Porsche 910 | Porsche Auto | 3:01.1000 |
| 12th | 33 | Jonathan Williams / Mario Casoni | Ferrari Dino 206 S | Scuderia Brescia Corse | 3:02.4000 |
| 13th | 38 | Joe Buzzetta / Peter Gregg | Porsche 906 | Porsche Auto | 3:03.8000 |
| 14th | 12 | Roger McCluskey / John Fulp | Lola T70 Mk.2 Chevrolet | John R. Fulp | 3:04.6000 |
| 15th | 34 | Günther Klass / Herbert Müller | Ferrari Dino 206 S | Scuderia Filipinetti | 3:04.8000 |
| 16th | 14 | William Wonder / Raymond Caldwell | Ford GT40 | William Wonder | 3:05.8000 |
| 17th | 40 | Rico Steinemann / Dieter Spoerry | Porsche 906 LH | Squadra Tartaruga | 3:05.8000 |
| 18th | 42 | John Cannon / Ed Hugus | Porsche 906 | Ed Hugus | 3:06.0000 |
| 19th | 39 | Udo Schütz / Gijs van Lennep / Rolf Stommelen | Porsche 906 | Porsche Auto | 3:06.2000 |
| 20th | 35 | Ed Crawford / Charlie Kolb | Ferrari Dino 206 S | NART | 3:07.5000 |
| 21st | 66 | Roberto Bussinello / Gaston Andrey | Alfa Romeo T33 | Autodelta | 3:11.0000 |
| 22nd | 4 | Joe Welch / George Wintersteen | Chevrolet Corvette | Roger Penske | 3:12.2000 |
| 23rd | 23 | Ricardo Rodriguez / Federico de la Chica | Ferrari 250 LM | Federico de la Chica | 3:13.7000 |
| 24th | 8 | Don Yenko / Dave Morgan | Chevrolet Corvette Sting Ray | Sunray DX Oil Co. | 3:14.0000 |
| 25th | 70 | Roger West / Joseph Ausburn / Bobby Allison | Shelby GT350 | Treadwell Ford Racing Team | 3:19.8000 |
| 26th | 17 | Bob Grossman / William McNamara | Ford GT40 | Autosport International | 3:20.2000 |
| 27th | 47 | George Drolsom / Bill Campbell | Porsche 904 GTS | George Drolsom | 3:21.0000 |
| 28th | 18 | Fred van Beuren, Jr. / Paul Jett | Shelby GT350 | Dos Caballos Racing Team | 3:21.6000 |
| 29th | 9 | Or Costanzo / Gene Guy / David McClain | Chevrolet Corvette Sting Ray | Or. Costanzo | 3:22.8000 |
| 30th | 15 | Bob Nagel / Ray Heppenstall / Bill Seeley | Howmet Sprint Ford | Howmet Corporation | 3:23.4000 |
| 31st | 69 | Wilton T. Jowett, Jr. / Bob Mouat / Claude Cardwell | Chevrolet Corvette | Wilton T. Jowett | 3:24.4000 |
| 32nd | 30 | Paddy Hopkirk / Andrew Hedges | MGB GT | British Motor Corp. | 3:25.0000 |
| 33rd | 16 | Brad Brooker / Tom Yeager | Shelby GT350 | Brad Brooker | 3:25.2000 |
| 34th | 46 | Robert Kirby / Alan Johnson | Porsche 911 S | Bursch Tuned Exhaust | 3:25.8000 |
| 35th | 41 | Sepp Greger / Günter Besier | Porsche 911 S | Sepp Greger | 3:27.4000 |
| 36th | 45 | Jack Ryan / Bill Bencker | Porsche 911 S | RBM Motors | 3:28.6000 |
| 37th | 25 | Denise McCluggage / Pinkie Windridge | Ferrari 275 GTB/4 NART Spider | Northern Vermont Racing Team | 3:29.2000 |
| 38th | 60 | Richard Kondracki / Michael Pickering | Triumph Spitfire | Richard G. Kondracki | 3:29.2000 |
| 39th | 72 | Fred Opert / John Pauley / Bill Bowman / Lee Cutler | Porsche 911 S | Valvoline-Opert Racing Team | 3:30.0000 |
| 40th | 53 | Hugh Kleinpeter / Mike Rothschild | Beach Mk.8 Volkswagen | Competition Components, Inc. | 3:30.8000 |
| 41st | 43 | Phil Groggins / Bob Bailey / John Kelly | Porsche 356 SC | B & B Motors | 3:33.6000 |
| 42nd | 59 | Clive Baker / Rauno Aaltonen | Austin-Healey Sprite | Donald Healey Motor Co. | 3:35.4000 |
| 43rd | 71 | Paul Richards / Ray Cuomo / John Norwood | Shelby GT350 | Ring-Free Oil Racing | 3:38.0000 |
| 44th | 58 | Carson Baird / Roger Enever / Alec Poole | Austin-Healey Sprite | Donald Healey Motor Co. | 3:40.6000 |
| 45th | 48 | John Rhodes / Timo Mäkinen | MGB | British Motor Corp. | 3:43.2000 |
| 46th | 57 | Smokey Drolet / Anita Taylor | Alpine A110 Renault | Baker Racing Team | 3:43.4000 |
| 47th | 56 | Leo Cella / Claudio Maglioli / Sandro Munari | Lancia Fulvia HF | H.F. Squadra | 3:44.6000 |
| 48th | 28 | Milo Vega / John Witt / Bob Kingham | Triumph TR4A | Milo Vega | 3:46.0000 |
| 49th | 51 | Laszlo Siegmund / George Liebl | Volvo P1800 | Viper Racing, Inc. | 3:49.2000 |
| 50th | 61 | Howard Brown / Howard Hanna | Matra Djet 5S | Howard Hanna | 3:49.4000 |
| 51st | 29 | Tim Burr / Buell Owen | Triumph TR4A | Tim Burr | 3:50.6000 |
| 52nd | 49 | Gary Magwood / Ray Gray | MGB | Canadian Auto Racing Team | 3:54.0000 |
| 53rd | 63 | Suzy Dietrich / Donna Mae Mims | ASA 411 | Ring-Free Oil Racing Team | 3:55.4000 |
| 54th | 27 | T. J. Kelly / Whit Tharin / Wilbur Pickett | Triumph TR4 | Joseph C. Hines | 3:57.2000 |
| 55th | 54 | Anatoly Arutunoff / Bill Pryor | Alfa Romeo Giulia SV | A.R.C.O., Inc. | 4:07.5000 |
| 56th | 62 | Liane Engeman / Janet Guthrie | Matra Djet 5S | Ring-Free Oil Racing Team | 4:10.4000 |
| 57th | 68 | M. D. Smith / Billy Turner | Austin-Healey Sprite | Major Billy Turner | 4:23.0000 |
| 58th | 32 | Pedro Rodriguez / Jean Guichet | Ferrari Dino 206 S | Scuderia Ambroeus | 4:40.0000 |
| 59th | 21 | Richard Robson / Rajah Rodgers / Bill Buchman | Jaguar XKE | Richard Robson | no time |
| 60th | 55 | George Waltman / Nick Cone | Osca GT 1600 Maserati | George Waltman | no time |