(Grid Positions)
| Grid | No. | Drivers | Car | Entrant |
| 1st | 86 | Peter Gregg | Porsche 935/77A | Bayside Disposal Racing |
| 2nd | 18 | John Paul | Porsche 935 JLP-1 | JLP Racing |
| 3rd | 29 | Hurley Haywood | Porsche 935 | Vasek Polak Racing |
| 4th | 61 | Jim Busby | BMW 320i Turbo | Jim Busby Racing |
| 5th | 2 | George Follmer | Chevrolet Monza Turbo | Roy Woods Racing |
| 6th | 13 | Randolph Townsend | Porsche 935 | Andial |
| 7th | 6 | Greg Pickett | Chevrolet Corvette C3 | Pickett Racing |
| 8th | 16 | Roy Woods | Porsche 935/77A | Vasek Polak Racing |
| 9th | 26 | Milt Minter | Porsche 935/77A | Vasek Polak Racing |
| 10th | 111 | Bruce Canepa | Porsche 935 | Bruce Canepa |
| 11th | 88 | Tuck Thomas | Chevrolet Monza | Lancer Stores |
| 12th | 27 | Rich Sloma | Chevrolet Corvette | Automotive Enterprises |
| 13th | 44 | Bob Tullius | Triumph TR8 | Group 44 |
| 14th | 85 | Bruce Leven | Porsche 935 | Bayside Disposal Racing |
| 16th | 37 | Lew Larimer | Chevrolet Corvette C3 | |
| 17th | 43 | Frank Joyce | Chevrolet Corvette C3 | Phantom Racing |
| 18th | 3 | Dave Mock | Chevrolet Corvette | |
| 19th | 12 | Bob Matkovich | Chevrolet Corvette C3 | Round Table Racing |
| 20th | 33 | Mark Pielsticker | Chevrolet Monza | Mark Pielsticker |
| 21st | 91 | Gene Bothello | Chevrolet Corvette C3 | FEMSA/Kennedy |
| 22nd | 92 | Gary Carlen | Chevrolet Corvette C3 Roadster | |
| 23rd | 32 | Art Siri, Jr. | Chevrolet Corvette C3 | American GT Racing |
| 24th | 22 | Mike Meek | Chevrolet Corvette C3 | |
| 25th | 96 | Terry Herman | Porsche 911 | |
| 27th | 11 | Paul Canary | Chevrolet Corvette | Arthur Treacher's |
| 28th | 65 | Ed Ruiz | Chevrolet Corvette | |
| 29th | 36 | David Arken | Chevrolet Corvette/Roadster | |
| 30th | 25 | William Maier | Ford Mustang | William Maier |
| 31st | 46 | Neil Vanni | Datsun 280Z | Wild Ride Racing |
| 32nd | 39 | Rich Colombo | Chevrolet Corvette | |
| 33rd | 23 | Bob Zulkowski | Porsche 914/6 | Metal Craft Racing |
| 34th | 56 | Bruce Sanders | Porsche 914/6 | |
| 35th | 78 | Babe Headley | Chevrolet Corvette | Babe's Garage |
| 36th | 74 | Bob Young | Chevrolet Corvette | |
| 37th | 17 | Rick Stark | Chevrolet Corvette | Rick Stark Enterprises |
| 38th | 41 | Bill Craine | Chevrolet Corvette C3 | B.C. Auto Body |
| 39th | 20 | Larry Stephens | Chevrolet Corvette C3 | |
| 40th | 14 | Pete Brallier | Chevrolet Corvette | Round Table Racing |
| 41st | 44A | Tom Eastham | Chevrolet Camaro Z28 | |
| 42nd | 21 | Peter Shutts | Shelby GT350 | |
| 43rd | 31 | Marc Rothman | Porsche Carrera | |
| 44th | 84 | Geoff Knight | Chevrolet Camaro | Knight Realty |
| 45th | 93 | Michael Oleyar | Chevrolet Corvette | E. F. Miller & Co. |
| 46th | 80 | Herb Adams | Pontiac Fire-Am | |
Other present cars:
| No. | Drivers | Car | Entrant |
| 0 | Michael Oleyar | Chevrolet Camaro | Oftedahl Racing |
| 71 | Jeff Weymouth | Chevrolet Corvette | |
Entered cars that did not arrive:
| No. | Drivers | Car | Entrant |
| 9 | | Porsche 934 | Vasek Polak Racing |
| 10 | Roy Woods | Chevrolet Monza Turbo | Roy Woods |
| 57 | Monte Shelton | Porsche 935 | |
| Larry Green | Porsche 911 Carrera RSR | Green Racing |
| Rainer Neuman | Ford Mustang | |
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