| 1st | 2 | Mario Andretti / Jacky Ickx | Ferrari 312 PB | Ferrari Automobili | 1:44.2200 |
| 2nd | 4 | Clay Regazzoni / Brian Redman | Ferrari 312 PB | Ferrari Automobili | 1:44.9600 |
| 3rd | 6 | Tim Schenken / Ronnie Peterson | Ferrari 312 PB | Ferrari Automobili | 1:46.0400 |
| 4th | 12 | Reine Wisell / Jo Bonnier | Lola T280 Ford | Ecurie Bonnier | 1:46.1200 |
| 5th | 7 | Peter Revson / Rolf Stommelen | Alfa Romeo T33/TT/3 | Autodelta, S.P.A. | 1:46.7700 |
| 6th | 5 | Vic Elford / Helmut Marko | Alfa Romeo T33/TT/3 | Autodelta, S.P.A. | 1:48.0600 |
| 7th | 14 | Gérard Larrousse / Chris Craft / Nestor Garcia-Veiga | Lola T280 Ford | Ecurie Bonnier | 1:48.7700 |
| 8th | 9 | Nanni Galli / Andrea de Adamich | Alfa Romeo T33/3-71 | Autodelta, S.P.A. | 1:49.0300 |
| 9th | 32 | Arturo Merzario / Alex Soler-Roig | Abarth 2000 SP/71 | Abarth-Osella | 1:52.0700 |
| 10th | 11 | Jerry Thompson / Ron Weaver / Tony DeLorenzo | Chevrolet Corvette C3 Spyder | Ronald R. Weaver | 1:58.5000 |
| 11th | 82 | Tony Dean / Bob Brown | Porsche 908/02 | A. G. Dean | 1:59.0800 |
| 12th | 57 | Robert R. Johnson / Dave Heinz | Chevrolet Corvette | Dave Heinz Racing | 2:00.0800 |
| 13th | 25 | Rodolfo Junco / Fred van Beuren, Jr. | Chevron B19 Ford | Doug Shierson/Fred Opert Mexican-American Racing Team | 2:00.2700 |
| 14th | 26 | Nick Craw / Bill Barber | Chevron B19 Ford | Doug Shierson/Fred Opert Mexican-American Racing Team | 2:01.3900 |
| 15th | 62 | Jorge de Bagration / Juan Fernandez | Porsche 908/03 | Escuderia Montjuich | 2:01.5000 |
| 16th | 21 | Luigi Chinetti, Jr. / George Eaton | Ferrari 312 P | North American Racing Team | 2:02.8200 |
| 17th | 55 | Roger McCaig / Maurice McCaig | Lola T212 Ford | Roger McCaig Racing | 2:03.1000 |
| 18th | 70 | Gene Harrington / Larry Bock | Chevrolet Camaro | Gene Harrington | 2:03.5500 |
| 19th | 8 | Jim Fitzgerald / Tom Nehl | Chevrolet Camaro | Automotive Engineering Enterprises | 2:04.5000 |
| 20th | 48 | Tony Adamowicz / John Greenwood | Chevrolet Corvette | John Greenwood Racing | 2:04.8700 |
| 21st | 59 | Hurley Haywood / Peter Gregg | Porsche 911 S | Brumos Porsche Audi Corp. | 2:04.9600 |
| 22nd | 52 | Joie Chitwood / Tim Chitwood | Chevrolet Camaro | Chitwood Chevrolet, Inc. | 2:05.9400 |
| 23rd | 22 | Sam Posey / Ronnie Bucknum / Luigi Chinetti, Jr. | Ferrari 365 GTB/4 | North American Racing Team | 2:06.9000 |
| 24th | 47 | Vince Gimondo / Chuck Dietrich | Chevrolet Camaro | Takondo Racing | 2:07.5000 |
| 25th | 50 | Don Yenko / John Cordts | Chevrolet Corvette C3 | John Greenwood Racing | 2:07.8100 |
| 26th | 56 | Tom Waugh / Hugh Kleinpeter | Lola T212 Ford | Promotional Advertising Corp. | 2:07.9300 |
| 27th | 61 | Jim Locke / Bob Bailey | Porsche 911 S | James Locke | 2:08.1900 |
| 28th | 94 | Bob Mitchell / Bob Christiansen | Chevrolet Camaro | Bolus & Snopes, Ltd. | 2:08.6900 |
| 29th | 54 | Brian Goellnicht / Bill Pryor | Abarth 2000 SP (SE010) | Automobile International Inc. | 2:09.1700 |
| 30th | 43 | Javier Garcia / Manuel Garcia | Chevrolet Camaro | Garcia Racing | 2:09.5000 |
| 31st | 24 | John Buffum / John Fitzpatrick | Ford Escort RS 1600 | Libra International Racing | 2:09.5100 |
| 32nd | 16 | Michael Keyser / Bob Beasley | Porsche 911 S | Toad Hall Racing | 2:09.5200 |
| 33rd | 72 | Lee McDonald / Bert Everett | Porsche 914/6 | Lee McDonald, Algar Porsche Audi | 2:09.5300 |
| 34th | 42 | Luis Sereix / Ralph Noseda | Chevrolet Camaro | Jose Garcia b/d/ a Garcia Racing | 2:10.6500 |
| 35th | 51 | Bobby Spirgel / Arthur Mollin | Chevrolet Corvette Sting Ray | Warren Shiber | 2:11.2900 |
| 36th | 18 | Charles Reynolds / Clive Baker | Ferrari 365 GTB/4 | Ring Free Oil Racing Team c/o Baker Motor Co. | 2:11.4900 |
| 37th | 53 | Michael Oleyar / Robert Luebbe | Chevrolet Corvette | Michael Oleyar | 2:11.5000 |
| 38th | 41 | Peter Kirill / Russ Norburn | Porsche 911 S | Kirill Racing/Brundick Motor Co. Ltd. | 2:12.0800 |
| 39th | 80 | John Elliott / Don Gwynne | Chevrolet Camaro | Preston Hood Chevrolet, Inc. | 2:12.5000 |
| 40th | 86 | Paul Fleming / David Boggs | Pontiac Firebird | Simone Fleming | 2:13.5000 |
| 41st | 58 | Hector Rebaque / Guillermo Rojas | Porsche 914/6 | Brumos Porsche Audi Corp. | 2:14.8700 |
| 42nd | 76 | George Stone / Bruce Jennings | Porsche 911 T | Silverstone Racing Team | 2:16.1000 |
| 43rd | 66 | John Belperche / George Rollin | Porsche 911 S | John Belperche | 2:19.5000 |
| 44th | 19 | David McClain / Dave White | Porsche 914/6 | David McClain | 2:19.5100 |
| 45th | 60 | Robert Fordyce / Richard Small | Chevrolet Camaro | Robert Fordyce | 2:22.5000 |
| 46th | 93 | Dave Houser / Wilbur Shaw, Jr. | Shelby GT350 | Bolus & Snopes, Ltd. | 2:26.5000 |
| 47th | 27 | Richard Schuck / Richard Weiss | Porsche 911 S | Dr. Richard Weiss | 2:29.8300 |
| 48th | 89 | Bert Gafford / Houghton Smith / Tom Fraser | Chevrolet Camaro | Smith-Kemp AutoRacing Team | 2:43.5000 |
| 49th | 88 | Charlie Kemp / Tom Fraser / Houghton Smith | Chevrolet Corvette | Smith-Kemp AutoRacing Team | 4:49.7200 |
| 50th | 33 | R. Sheldon Stafford / Ron Stafford | Chevrolet Corvette | R. Sheldon Stafford | no time |
| 51st | 17 | John Tremblay / David Ellis-Brown | Chevrolet Camaro I | C. C. Canada, Inc. | no time |
| 52nd | 74 | Al Straub / Norm Mosher | Ford Mustang | Norman Mosher | no time |
| 53rd | 87 | Buck Baker / Larry Baker | Pontiac Firebird | Buck Baker | no time |
| 54th | 28 | Erwin Kremer / Günther Huber | Porsche 911 S | Porsche Kremer Team | no time |
| 55th | 40 | Levon Pentecost / Anthony Torgersen | Porsche 911 S | Northlake Porsche Audi Inc. | no time |
| 56th | 81 | Daniel Muniz / Ruben Novoa | Porsche 914/6 | Daniel Muniz | no time |
| 57th | 99 | Robert Whitaker / Phil Currin | Chevrolet Corvette | Phil Currin | no time |