(All Session Laps)
| Pos. | No. | Drivers | Car | Entrant | All Best | Q Time |
| 1st | 59 | Gregg / Ludwig | Porsche 935/79 | Brumos Porsche | 1:40.796 | 1:40.7960 |
| 2nd | 18 | Paul / Holbert | Porsche 935 JLP-1 | JLP Racing | 1:42.869 | 1:42.8690 |
| 3rd | 6 | Stommelen / Redman / Barbour | Porsche 935/77A | Dick Barbour Racing | 1:44.247 | 1:44.2470 |
| 4th | 3 | Busby / *Hezemans | BMW 320i Turbo | Jim Busby Racing | 1:44.423 | 1:44.4230 |
| 5th | 19 | Cord / Adams | Chevrolet Monza | Chris Cord | 1:44.760 | 1:44.7600 |
| 6th | 2 | Winkelhock / Hobbs / *Busby | BMW 320i Turbo | McLaren North America | 1:45.284 | 1:45.2840 |
| 7th | 94 | Whittington / Whittington | Porsche 935/79 | Whittington Brothers Racing | 1:45.370 | 1:45.3700 |
| 8th | 09 | Bondurant / Henn | Porsche 935/77A | Thunderbird Swap Shop | 1:45.521 | 1:45.5210 |
| 9th | 00 | Field / Minter | Porsche 935/77A | Interscope Racing | 1:47.386 | 1:47.3860 |
| 10th | 5 | Mendez / Miller | Porsche 935 | Busch Beer Racing | 1:47.909 | 1:47.9090 |
| 11th | 10 | Chandler / Thomas | Porsche 935/79 | Otis Chandler | 1:48.215 | 1:48.2150 |
| 12th | 4 | McKitterick / Garretson / Belcher | Porsche 935 | Dick Barbour Racing | 1:48.675 | 1:48.6750 |
| 13th | 9 | McFarlin / Woods / Akin | Porsche 935 | Dick Barbour Racing | 1:48.731 | 1:48.7310 |
| 14th | 13 | Shaw, Jr. / *Moran / *Brockman | Porsche 935 | Hal Shaw Racing | 1:51.051 | 1:51.0510 |
| 15th | 24 | Frank / Kent-Cooke | Chevrolet Monza | Tom Frank | 1:52.349 | 1:52.3490 |
| 16th | 55 | Meister / Knoop | Porsche Carrera RSR | Alan L. Johnson | 1:53.020 | 1:53.0200 |
| 17th | 49 | Currin / Carusso | Chevrolet Corvette C3 | Autodyne | 1:53.958 | 1:53.9580 |
| 18th | 54 | Garcia / Herman | Porsche Carrera RSR | Montura Racing | 1:54.857 | 1:54.8570 |
| 19th | 23 | Cook / Kirby | Porsche Carrera | Cerwin-Vega | 1:55.668 | 1:55.6680 |
| 20th | 38 | Ferrer / Fernandez | Porsche Carrera RSR | Boricua Racing | 1:55.806 | 1:55.8060 |
| 21st | 32 | Espinosa / Lopez / Cortes | Porsche Carrera RSR | Botero Racing | 1:56.076 | 1:56.0760 |
| 22nd | 41 | Jones, Jr. / *Faul | Chevrolet Camaro | Jones Ind. Racing | 1:56.155 | 1:56.1550 |
| 23rd | 83 | Devendorf / Adamowicz | Datsun 280ZX | Electramotive | 1:56.397 | 1:56.3970 |
| 24th | 07 | Cowart / Miller | Porsche Carrera RSR | Morrison's | 1:56.912 | 1:56.9120 |
| 25th | 64 | Aase / Johnson | Porsche 911 | Dennis Aase | 1:57.047 | 1:57.0470 |
| 26th | 34 | Richie / *Scott / *Miller | Porsche 911 | Craig Richie | 1:58.059 | 1:58.0590 |
| 27th | 33 | Posey / *Newman | Datsun 280ZX | Bob Sharp Racing | 1:58.240 | 1:58.2400 |
| 28th | 17 | Kline / Mederer | Mazda RX-7 | Racing Beat | 1:58.600 | 1:58.6000 |
| 29th | 31 | Marx / *Rothman / *Hammond | Porsche 911 Carrera RSR | RSR Associates | 1:59.270 | 1:59.2700 |
| 30th | 77 | Mandeville / Downing | Mazda RX-7 | Roger Mandeville | 1:59.306 | 1:59.3060 |
| 31st | 62 | Koll / Bean | Porsche 914/6 | Koll Motor Sports | 1:59.844 | 1:59.8440 |
| 32nd | 46 | DeNarvaez / Naon | Porsche 911 Carrera RSR | de Narvaez Racing | 2:00.112 | 2:00.1120 |
| 33rd | 06 | Milledge / Overstreet | Porsche 914/6 | Darrel Overstreet | 2:00.169 | 2:00.1690 |
| 34th | 35 | Fisher / Parks | Mazda RX-7 | JLC Racing | 2:00.288 | 2:00.2880 |
| 35th | 56 | Borlase / Kravig | Porsche 911 | Rick Borlase | 2:00.558 | 2:00.5580 |
| 36th | 01 | White / Bedard | BMW 320i | J. Kurt Roehrig | 2:00.946 | 2:00.9460 |
| 37th | 88 | Maashoff / Korpiel / Maashoff | Porsche 911 | Crismark | 2:05.310 | 2:05.3100 |
| 38th | 36 | Case / Sharp | Porsche 911 | Case Racing | 2:08.548 | 2:08.5480 |
| 39th | 66 | Crevier / Laetsch / McKitterick | Ferrari 365 GTB/4 | Joe Crevier | 2:09.265 | 2:09.2650 |
| 40th | 14 | Vegher / Hines | Alfa Romeo GTV | Veloce Motors West | 2:10.240 | 2:10.2400 |
Other present cars:
| No. | Drivers | Car | Entrant |
| 7 | Bohren / Cortez | Mazda RX-7 | Walt Bohren Racing |
| 8 | Arutunoff / Marina | Lancia Stratos | Automobile International |
| 11 | Nylander / *Nylander | Porsche 911 | Race Tech |
| 16 | Follmer / Lunger / Bell | Porsche 935/77A | Vasek Polak |
| 21 | Earle / Smith | Porsche Carrera | Vasek Polak |
| 22 | Mandella / *Ridgely / *Stephens | Porsche 914/6 | Cerwin-Vega |
| 25 | Zulkowski / Storc | Porsche 914/6 | Metal Craft Racing |
| 26 | Ware / *Rouff | Chevrolet Camaro | John Ware |
| 30 | Moretti / Haywood | Porsche 935/79 | Electrodyne/Moretti |
| 37 | Wellik / *Rippie | Chevrolet Corvette | Doug Rippie |
| 39 | Hansen / Higgins | Porsche 911 | Barrick Motor Racing |
| 48 | Leary / Mollett | Datsun 240Z | Frank Leary |
| 51 | Lawson / *Goodspeed / *Douglas | Porsche 914/6 | John Goodspeed |
| 52 | Baker / Winters | Porsche 914/4 | Personalized Autohaus |
| 60 | Bond / Tilton | Porsche 911 | E. J. Pruitt |
| 63 | Gustafson / Halsmer / *Worley | Porsche 911 | Greg Gustafson |
| 79 | Bergstrom / Frisselle | Mazda RX-7 | Sports Ltd. Racing |
| 82 | Harrison / Brewster | Porsche 914/6 | Schneider Autohaus |
| 0T | Field / Minter | Porsche 935/79 | Interscope Racing |
| 12 | Gonzalez / Morton | Porsche 935 | Vasek Polak |
| 15 | Gebhardt / Beilcke | BMW 3.5 CSL | Bavarian Motors International |
| 20 | Larry Stephans | Chevrolet Corvette | Larry Stephans |
| 45 | Perlin / McNicol | Porsche 911 | Mike Perlin |
| 75 | Pearson / Cortez | Ford Mustang | Patrick Pearson |
| 78 | Burns / Scopazzi | Alfa Romeo GTV | Anthony's Auto Craft |
| 83T | Devendorf / Adamowicz | Datsun 240Z | Electramotive |
Entered cars that did not arrive:
| No. | Drivers | Car | Entrant |
| 40 | Craine / Mathey | Chevrolet Corvette | Bill Craine |
| 43 | Gregg / Jones | Porsche 911 | Bob Gregg |
| 47 | Shaw / Cordoba / LaCava | Honda Civic | William L. Shaw |
| 76 | Joe Chamberlain | Chevrolet Corvette | Arrow Racing |
| 85 | Pielsticker / Gallant | Chevrolet Monza | Mark Pielsticker |
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