| 1st | 6 | Donohue / Hobbs | Ferrari 512 M spec. | Penske-White Racing | 1:42.4200 | 133.9190 |
| 2nd | T | Vic Elford | Porsche 917 K | Martini & Rossi Racing Team | 1:43.6300 | |
| 3rd | 2 | Rodriguez / Oliver | Porsche 917 K | J. W. Automotive Engineering | 1:43.6800 | |
| 4th | 22 | Revson / Posey / Parsons / Chinetti, Jr. | Ferrari 512 M | North American Racing Team | 1:43.9500 | |
| 5th | 1 | Siffert / Bell | Porsche 917 K | J. W. Automotive Engineering | 1:44.4400 | |
| 6th | 4 | Elford / van Lennep | Porsche 917 K | Martini & Rossi Racing Team | 1:45.3900 | |
| 7th | 3 | Marko / Lins | Porsche 917 K | Martini & Rossi Racing Team | 1:45.5600 | |
| 8th | 20 | Gregory / Young / *Cannon | Ferrari 512 M | Young American Racing/North American Racing Team | 1:46.6500 | |
| 9th | 23 | Bucknum / Adamowicz / *De Cadenet | Ferrari 512 S Spyder | North American Racing Team | 1:50.2000 | |
| 10th | 28 | Merzario / Juncadella | Ferrari 512 S | Escuderia Montjuich | 1:51.2100 | |
| 11th | 26 | Gosselin / de Fierlant | Ferrari 512 S | Jacques Swaters | 1:54.1400 | |
| 12th | 11 | DeLorenzo / Yenko / Mahler | Chevrolet Corvette C3 | Owens Corning Fiberglass | 1:57.1900 | |
| 13th | 21 | Garcia-Veiga / Chinetti, Jr. / De Cadenet | Ferrari 312 P/71 | North American Racing Team | 1:58.9500 | |
| 14th | 12 | Thompson / Mahler | Chevrolet Corvette C3 | Owens Corning Fiberglass | 1:59.0000 | |
| 15th | 74 | Straub / Brown | Ford Mustang | Al Straub | 2:00.0000 | |
| 16th | 50 | Greenwood / Barker / Lang | Chevrolet Corvette | John Greenwood | 2:00.7800 | |
| 17th | 47 | Tremblay / McDill / Beatty | Chevrolet Camaro I | Bruce Behrens Racing | 2:04.0000 | |
| 18th | 57 | Heinz / Costanzo | Chevrolet Corvette C3 | David Heinz Racing, Inc. | 2:07.0800 | |
| 19th | 17 | Gimondo / Dietrich | Chevrolet Camaro II Z/28 | Tokondo Racing | 2:08.6900 | |
| 20th | 45 | Baker / Grossman / Brown / Reynolds | Chevron B16 Ford | Baker Motor Company | 2:08.7500 | |
| 21st | 79 | Lawrence / Moore / Bishop | Shelby GT350 | Danny L. Moore | 2:11.0000 | |
| 22nd | 64 | Luebbe / Baechle / Orr | Chevrolet Corvette | Robert Luebbe | 2:11.0000 | |
| 23rd | 98 | Matthews / Savage / Ongais | Ford Mustang | Ed Matthews | 2:12.0000 | |
| 24th | 72 | Mitchell / Kemp | Chevrolet Camaro | Robert R. Mitchell | 2:12.0000 | |
| 25th | 75 | Pettey / Bock | Ford Mustang | Reventlow-Pettey Automobiles | 2:12.0100 | |
| 26th | 59 | Gregg / Haywood | Porsche 914/6 | Brumos Porsche Audi Corp | 2:12.0100 | |
| 27th | 97 | Stumes / Cummings | Shelby GT350 | Susan Trumbull Cummings | 2:13.4100 | |
| 28th | 36 | Matzen / Heyser / Sears | Ford Mustang | Racing Specialties Co. | 2:14.0000 | |
| 29th | 88 | Mastandrea / Lilly | Chevrolet Camaro Z/28 | Norberto Mastandrea | 2:14.0000 | |
| 30th | 31 | Everett / Locke / Netterstrom | Porsche 911 T | Locke Lake Colony | 2:15.0000 | |
| 31st | 5 | Duval / Nicholas / Bailey | Porsche 914/6 | Sun Oil Company | 2:15.0000 | |
| 32nd | 14 | Canada / Hines, Jr. / Pickett | Chevrolet Camaro Z/28 | Boykin Auto Repairs | 2:15.3100 | |
| 33rd | 15 | Kirill / Tisdelle | Porsche 911 S | K&T Enterprises | 2:16.0000 | |
| 33rd | 33 | McComb / Tullius | Ford Mustang | John McComb | 2:16.0900 | |
| 34th | 19 | Behr / Buffum / Kremer | Porsche 914/6 | Ralph Meaney | 2:16.4600 | |
| 35th | 18 | Meaney / Bean / Wright | Porsche 914/6 | Ralph Meaney | 2:16.5900 | |
| 36th | 8 | Nehl / Perry | Porsche 911 S | American Racing Promotions | 2:18.0000 | |
| 37th | 89 | Brimble / Smith | Chevrolet Camaro | H. Houghton Smith | 2:18.0000 | |
| 38th | 43 | Hanrioud / Sage | Chevron B16 Ford | Jean-Pierre Hanrioud | 2:18.7600 | |
| 39th | 16 | Keyser / Beasley / Jennings | Porsche 911 S | Toad Hall Racing | 2:19.0000 | |
| 40th | 42 | Garcia / Sereix / Small | Chevrolet Camaro Z/28 | Garcia Racing Jose M. Garcia | 2:20.0000 | |
| 41st | 40 | Hochreuter / Bartling / *Petermann / *Brezinka | Porsche 911 | Fritz Hochreuter | 2:21.0000 | |
| 42nd | 10 | Walle / Sherwin | Porsche 911 S | Walle Enterprises | 2:21.1000 | |
| 44th | 46 | Rinzler / Christian / Fraser / Baker | Chevron B16 Ford | Baker Motor Company | 2:22.6200 | |
| 45th | 91 | Noseda / Nunez / *Stevens / *Mummery | Chevrolet Camaro Z/28 | Larrauri Racing | 2:23.0000 | |
| 46th | 48 | Dobkin / Maynard / Oliver | Chevrolet Camaro I | S-Car-Go-Racing | 2:23.6100 | |
| 47th | 51 | Gammon / Donley / Garza | MGB GT | Waldron Motors Racing Team | 2:24.5700 | |
| 48th | 52 | Scott / Lanier / Houser | MGB GT | Waldron Motors Racing Team | 2:26.0000 | |
| 49th | 70 | Belperche / Davidson | Triumph GT6 | William A. Davidson | 2:29.0000 | |
| 50th | 92 | Cordts / Pike | Pontiac Firebird | B.F. Goodrich Tire Co. | 2:30.0000 | |
| 51st | 44 | Hindson / Noah / Bunker | Porsche 911 T | Art Bunker | 2:30.0000 | |
| 52nd | 65 | Rhindress / Clark | Lancia Fulvia HF | Homeline Corp. | 2:34.0000 | |
| 53rd | 55 | Clark / Kearney | Datsun 510 | Clearwater Datsun | 2:34.0000 | |
| 54th | 93 | Whitaker / Tunstall / Reed | Volvo P1800 | Donald S. Wright | 2:34.0000 | |
| 55th | 73 | Lewis / Fairbrother | Ford Cortina GT | Robert E. Lewis | 2:35.0000 | |
| 56th | 38 | Fleming / Johnson / Barnes | Fiat 124 Sport Coupe | Simone N. Fleming | 2:38.0000 | |
| 57th | 41 | Taylor / Goldrich / Dyer / Goldleaf | Alfa Romeo GTV | Del Taylor | 2:41.0000 | |
| 58th | 35 | Wilson / Collins | Chevrolet Camaro | Collins-Wilson Racing Ent. | 2:42.0000 | |
| 59th | 77 | Marcus / Dent | BMW 2002 | Grand Prix Motors | 2:42.0000 | |
| 60th | 80 | Lieb / Drolet / Daroff | Dodge Dart | Fred Lieb | 2:44.0000 | |
| 61st | 37 | Johnson / Mims / Wetzel / Nagel | Chevrolet Vega | Yenko Sportscars, Inc. | 2:44.0000 | |
| 62nd | 81 | Tillson / Oest / Junco | Lancia Fulvia Rallye | Dieter R. Oest | 2:57.0000 | |