| 1st | 2 | Andretti / Ickx | Ferrari 312 PB | Ferrari Automobili | 1:44.220 | 1:44.2200 |
| 2nd | 4 | Regazzoni / Redman | Ferrari 312 PB | Ferrari Automobili | 1:44.960 | 1:44.9600 |
| 3rd | 6 | Schenken / Peterson | Ferrari 312 PB | Ferrari Automobili | 1:46.040 | 1:46.0400 |
| 4th | 12 | Wisell / Bonnier / *Larrousse / *Garcia-Veiga | Lola T280 Ford | Ecurie Bonnier | 1:46.120 | 1:46.1200 |
| 5th | 7 | Revson / Stommelen | Alfa Romeo T33/TT/3 | Autodelta, S.P.A. | 1:46.770 | 1:46.7700 |
| 6th | 5 | Elford / Marko | Alfa Romeo T33/TT/3 | Autodelta, S.P.A. | 1:48.060 | 1:48.0600 |
| 7th | 14 | Larrousse / Craft / Garcia-Veiga | Lola T280 Ford | Ecurie Bonnier | 1:48.770 | 1:48.7700 |
| 8th | 9 | Galli / de Adamich / *Vaccarella / *Hezemans | Alfa Romeo T33/3-71 | Autodelta, S.P.A. | 1:49.030 | 1:49.0300 |
| 9th | 32 | Merzario / Soler-Roig | Abarth 2000 SP/71 | Abarth-Osella | 1:52.070 | 1:52.0700 |
| 10th | 3 | de Adamich / Galli | Alfa Romeo T33/TT/3 | Autodelta, S.P.A. | 1:52.390 | 1:52.3900 |
| 11th | 11 | Thompson / Weaver / DeLorenzo | Chevrolet Corvette C3 Spyder | Ronald R. Weaver | 1:58.500 | 1:58.5000 |
| 12th | 82 | Dean / Brown | Porsche 908/02 | A. G. Dean | 1:59.080 | 1:59.0800 |
| 13th | 57 | Johnson / Heinz | Chevrolet Corvette | Dave Heinz Racing | 2:00.080 | 2:00.0800 |
| 14th | 25 | Junco / van Beuren, Jr. | Chevron B19 Ford | Doug Shierson/Fred Opert Mexican-American Racing Team | 2:00.270 | 2:00.2700 |
| 15th | 26 | Craw / Barber | Chevron B19 Ford | Doug Shierson/Fred Opert Mexican-American Racing Team | 2:01.390 | 2:01.3900 |
| 16th | 62 | de Bagration / Fernandez | Porsche 908/03 | Escuderia Montjuich | 2:01.500 | 2:01.5000 |
| 17th | 21 | Chinetti, Jr. / Eaton | Ferrari 312 P | North American Racing Team | 2:02.820 | 2:02.8200 |
| 18th | 55 | McCaig / McCaig | Lola T212 Ford | Roger McCaig Racing | 2:03.100 | 2:03.1000 |
| 19th | 70 | Harrington / Bock | Chevrolet Camaro | Gene Harrington | 2:03.550 | 2:03.5500 |
| 20th | 8 | Fitzgerald / Nehl | Chevrolet Camaro | Automotive Engineering Enterprises | 2:04.500 | 2:04.5000 |
| 21st | 48 | Adamowicz / Greenwood | Chevrolet Corvette | John Greenwood Racing | 2:04.870 | 2:04.8700 |
| 22nd | 59 | Haywood / Gregg | Porsche 911 S | Brumos Porsche Audi Corp. | 2:04.960 | 2:04.9600 |
| 23rd | 52 | Chitwood / Chitwood | Chevrolet Camaro | Chitwood Chevrolet, Inc. | 2:05.940 | 2:05.9400 |
| 24th | 22 | Posey / Bucknum / Chinetti, Jr. | Ferrari 365 GTB/4 | North American Racing Team | 2:06.900 | 2:06.9000 |
| 25th | 47 | Gimondo / Dietrich | Chevrolet Camaro | Takondo Racing | 2:07.500 | 2:07.5000 |
| 26th | 50 | Yenko / Cordts | Chevrolet Corvette C3 | John Greenwood Racing | 2:07.810 | 2:07.8100 |
| 27th | 56 | Waugh / Kleinpeter | Lola T212 Ford | Promotional Advertising Corp. | 2:07.930 | 2:07.9300 |
| 28th | 61 | Locke / Bailey | Porsche 911 S | James Locke | 2:08.190 | 2:08.1900 |
| 29th | 94 | Mitchell / Christiansen | Chevrolet Camaro | Bolus & Snopes, Ltd. | 2:08.690 | 2:08.6900 |
| 30th | 54 | Goellnicht / Pryor | Abarth 2000 SP (SE010) | Automobile International Inc. | 2:09.170 | 2:09.1700 |
| 31st | 43 | Garcia / Garcia / *Garcia | Chevrolet Camaro | Garcia Racing | 2:09.500 | 2:09.5000 |
| 32nd | 24 | Buffum / Fitzpatrick | Ford Escort RS 1600 | Libra International Racing | 2:09.510 | 2:09.5100 |
| 33rd | 16 | Keyser / Beasley | Porsche 911 S | Toad Hall Racing | 2:09.520 | 2:09.5200 |
| 34th | 72 | McDonald / Everett | Porsche 914/6 | Lee McDonald, Algar Porsche Audi | 2:09.530 | 2:09.5300 |
| 35th | 42 | Sereix / Noseda / *Cao | Chevrolet Camaro | Jose Garcia b/d/ a Garcia Racing | 2:10.650 | 2:10.6500 |
| 36th | 51 | Spirgel / Mollin | Chevrolet Corvette Sting Ray | Warren Shiber | 2:11.290 | 2:11.2900 |
| 37th | 18 | Reynolds / Baker / *Grossman | Ferrari 365 GTB/4 | Ring Free Oil Racing Team c/o Baker Motor Co. | 2:11.490 | 2:11.4900 |
| 38th | 53 | Oleyar / Luebbe | Chevrolet Corvette | Michael Oleyar | 2:11.500 | 2:11.5000 |
| 39th | 41 | Kirill / Norburn | Porsche 911 S | Kirill Racing/Brundick Motor Co. Ltd. | 2:12.080 | 2:12.0800 |
| 40th | 80 | Elliott / Gwynne | Chevrolet Camaro | Preston Hood Chevrolet, Inc. | 2:12.500 | 2:12.5000 |
| 41st | 86 | Fleming / Boggs | Pontiac Firebird | Simone Fleming | 2:13.500 | 2:13.5000 |
| 42nd | 58 | Rebaque / Rojas | Porsche 914/6 | Brumos Porsche Audi Corp. | 2:14.870 | 2:14.8700 |
| 43rd | 76 | Stone / Jennings | Porsche 911 T | Silverstone Racing Team | 2:16.100 | 2:16.1000 |
| 44th | 66 | Belperche / Rollin | Porsche 911 S | John Belperche | 2:19.500 | 2:19.5000 |
| 45th | 19 | McClain / White | Porsche 914/6 | David McClain | 2:19.510 | 2:19.5100 |
| 46th | 60 | Fordyce / Small | Chevrolet Camaro | Robert Fordyce | 2:22.500 | 2:22.5000 |
| 47th | 93 | Houser / Shaw, Jr. / *Yates | Shelby GT350 | Bolus & Snopes, Ltd. | 2:26.500 | 2:26.5000 |
| 48th | 75 | Clark / Kearney | Datsun 510 | Clearwater Datsun | 2:29.190 | 2:29.1900 |
| 49th | 27 | Schuck / Weiss | Porsche 911 S | Dr. Richard Weiss | 2:29.830 | 2:29.8300 |
| 50th | 79 | Johnson / Young | Chevrolet Camaro | Arrow Racing Team | 2:40.440 | 2:40.4400 |
| 51st | 89 | Gafford / Smith / Fraser | Chevrolet Camaro | Smith-Kemp AutoRacing Team | 2:43.500 | 2:43.5000 |
| 52nd | 88 | Kemp / Fraser / Smith | Chevrolet Corvette | Smith-Kemp AutoRacing Team | 4:49.720 | 4:49.7200 |