| 1st | 11 | Tony DeLorenzo / Steve Durst | Chevrolet Corvette 454 | Troy Promotions Inc. | 2:55.1300 |
| 2nd | 5 | Dave Heinz / Jerry Thompson | Chevrolet Corvette | Race Enterprise & Developments | 2:58.0100 |
| 3rd | 34 | Ike Knupp / Bob Tullius | Chevrolet Corvette | Murray Racing Team | 2:59.4200 |
| 4th | 59 | Peter Gregg / Hurley Haywood / Dave Helmick | Porsche Carrera RSR | Dr. Dave Helmick | 3:01.0800 |
| 5th | 1 | Michael Keyser / Milt Minter | Porsche 911 Carrera RSR | Toad Hall Motor Racing | 3:01.5400 |
| 6th | 94 | Wilbur Pickett / Bill Bean | Chevrolet Corvette | Leldon Blackwell | 3:02.4000 |
| 7th | 81 | Grey Egerton / Elliot Forbes-Robinson | Porsche 911 Carrera RSR 2.8 | Far West Racing | 3:02.4300 |
| 8th | 48 | John Greenwood / Don Yenko | Chevrolet Corvette | John Greenwood Racing | 3:03.1700 |
| 9th | 50 | Ron Grable / John Greenwood / Mike Brockman | Chevrolet Corvette C3 | John Greenwood Racing | 3:05.5200 |
| 10th | 17 | Vince Gimondo / Billy Dingman | Chevrolet Camaro II | Vince Gimondo | 3:05.5800 |
| 11th | 25 | John Buffum / Bert Everett | Ford Escort | Libra International Racing | 3:05.9600 |
| 12th | 69 | Ron Goldleaf / John Tunstall | Chevrolet Corvette | WGB Niagara Wines | 3:06.4100 |
| 13th | 62 | Jef Stevens / Pete Sherman | Chevrolet Corvette | Jeff Stevens Racing | 3:06.6600 |
| 14th | 49 | Jim Greendyke / Robert R. Johnson | Chevrolet Corvette C3 | John Greenwood Racing | 3:06.8900 |
| 15th | 57 | Javier Garcia / Reinaldo Almeida | Ford Mustang | Garcia Racing | 3:06.9200 |
| 16th | 8 | Gene Felton | Chevrolet Camaro II | Automotive Engineering | 3:07.6100 |
| 17th | 6 | Alex Davidson | Chevrolet Corvette | Alex Davidson | 3:09.1100 |
| 18th | 24 | Tim Chitwood / Joie Chitwood / Bob Nagel | Chevrolet Camaro | T. C. Racing | 3:09.6000 |
| 19th | 82 | Bob Bergstrom / Jim Cook | Porsche 911 S | Bob Bergstrom | 3:09.6700 |
| 20th | 40 | Tom Nell / Richard Dagiel / Joe Pirrotta | Chevrolet Corvette | Pironell Racing | 3:09.9600 |
| 21st | 9 | Ray Kessler / Jim Fitzgerald | Chevrolet Camaro | Ray Kessler Inc. | 3:10.9300 |
| 22nd | 37 | Dan Moore / David McCullough | Ford Mustang | Dan Moore | 3:10.9700 |
| 23rd | 76 | George Stone / Mike Downs | Porsche 911 S | Silverstone Racing Team | 3:13.1200 |
| 24th | 95 | George Dickinson / Eddie Wachs / Ernest Pultz | Porsche 911 | G. W. Dickinson | 3:13.4800 |
| 25th | 86 | Jim Lynch / Toby Milne | Porsche 911 ST | James Lynch | 3:13.6600 |
| 26th | 47 | Terry Keller / Bob Gray / Neil Potter | Chevrolet Corvette | Sebring Racing Inc. | 3:14.2600 |
| 27th | 42 | Luis Sereix / Tony Lilly / Dave Yoder | Chevrolet Camaro | Garcia Racing | 3:15.7500 |
| 28th | 28 | Ed Fleming | Chevrolet Camaro | Ed Fleming | 3:16.7300 |
| 29th | 70 | Marc Dancose | Porsche 911 ST | Marc Dancose | 3:17.0900 |
| 30th | 19 | Jose Rodriguez / Bob McClure | Chevrolet Camaro | U. S. Davis Racing | 3:17.2200 |
| 31st | 83 | Bert Gafford / John Belperche | Chevrolet Camaro | Houghton Smith | 3:17.3000 |
| 32nd | 99 | Phil Currin / Danny Fortin / Bill Johnson | Chevrolet Corvette | Phil Currin | 3:17.7600 |
| 33rd | 46 | Klaus Bytzek / Rudy Bartling | Porsche 911 S | Bytzek Automotive | 3:18.3000 |
| 34th | 87 | Sam Miller / Rob Henry | Ford Mustang | Miller/Hey | 3:18.5300 |
| 35th | 97 | Tony Ansley / Ron Connelly / Steve Avera | Chevrolet Corvette | Ansley Racing Enterprises | 3:18.8100 |
| 36th | 77 | Bruce Jennings / Bob Beasley | Porsche 911 S | Bruce Jennings | 3:18.9900 |
| 37th | 29 | Ralph Noseda / Ray Mummery / Richard Small | Chevrolet Camaro | Ralph M. Noseda | 3:19.0400 |
| 38th | 14 | Russ Boykin | Chevrolet Camaro | C. C. Canada | 3:19.1200 |
| 39th | 0 | John Elliott / Bill McDill | Chevrolet Camaro II | Byron Cook Racing | 3:19.2700 |
| 40th | 67 | David McClain / Dave White | Porsche 914/6 | David H. McClain | 3:19.3300 |
| 41st | 54 | Bill Schumacher / Rick Hay | Chevrolet Corvette | Iroquois Racing | 3:19.6700 |
| 42nd | 71 | Bob Christiansen / Gary Myers / John Tremblay | Chevrolet Camaro | Robert Christiansen | 3:19.7800 |
| 43rd | 91 | Dieter Oest / Mike Tillson / Harry Bytzek | Porsche 911 S | Holbert's Porsche-Audi | 3:20.3700 |
| 44th | 27 | Don Lindley / Stephen Behr / Brian Goellnicht | Porsche 911 S | Don Lindley | 3:21.9200 |
| 45th | 61 | Scott Chapman / John McLaren / Bill Hood | Chevrolet Corvette | Sebring Racing Inc. | 3:22.4800 |
| 46th | 7 | Eddie Johnson / Clay Young | Chevrolet Camaro | Eddie Johnson | 3:24.9700 |
| 47th | 72 | Albert Naon / Tony Garcia / John Freyre | Chevrolet Camaro | Alberto Naon | 3:27.0100 |
| 48th | 80 | J. Kirby Stumpff / Dick Vreeland / James Pirie | Shelby GT500 | J. Kirby Stumpff | 3:27.1800 |
| 49th | 4 | Bob Lillquist | Porsche 911 S | Western Sizzlin' Steak Houses | 3:29.0700 |
| 50th | 74 | Jacques Groleau / Craig Ross / Bill Shaw | Datsun 240Z | J. G. Racing | 3:29.7300 |
| 51st | 44 | Manuel Garcia | Chevrolet Nova | Larrauri Racing | 3:30.0500 |
| 52nd | 78 | Manuel Quintana / Reinaldo Almeida | Ford Mustang | Manuel Quintana | 3:30.3400 |
| 53rd | 114 | Jim Grob / Juan Montalvo | BMW 2002 | Jim Grob Racing | 3:30.3900 |
| 54th | 85 | Don Parish / Ron Jones / John Hulen | Porsche 914/6 | Donald Parish | 3:30.4800 |
| 55th | 41 | George Garcia / Vic Shinn | Chevrolet Corvette | George Garcia Racing | 3:31.0600 |
| 56th | 84 | Klaus Selbert / Sieg Glage | Porsche 911 S | Airport Motorsports | no time |
| 57th | 89 | Don Parish / Dave Causey / Edwin Taylor | Porsche 911 S | Thomas Barrick | no time |
| 58th | 175 | Jack Baldwin / Bobby Clark | Datsun 510 | U.S. Davis Racing | no time |
| 59th | 26 | Charlie Cook | Chevrolet Nova | Wayne Alexander | |
| 60th | 2 | Dean Donley / Ben Scott | MGB | Dean Donley | no time |
| 61st | 90 | Ray Walle / Richard Schuck | Mazda RX-2 | Z & W Mazda | no time |
| 62nd | 33 | Marc Davis / Richard Melville / Bob Beatty | Alfa Romeo GTV | RaceCo of Coral Gables | no time |
| 63rd | 75 | Tom Kuenz | Porsche 912 | Tom Kuenz | no time |
| 64th | 88 | Bob Lapp / Mike Meldeau | Datsun 240Z | Bob Lapp | no time |
| 65th | 00 | Whit Diggett / Amos Johnson | AMC Gremlin | Levi's Team Highball | no time |
| 66th | 110 | Bob Mitchell / Jim Williams | Dodge Colt | Bolus & Snopes | no time |
| 67th | 30 | Dennis Dallmeyer / Nick Dunn | Chevrolet Camaro | Dallmeyer Racing | no time |
| 68th | 3 | Dick Bauer / Jim DeStefano / Nick Engels | Chevrolet Corvette | Performance Associates | no time |
| 69th | 98 | Loren Pearson / William Spencer / Brian Taylor | Shelby GT500 | Loren Ross | no time |
| 70th | 92 | Dieter Oest / Don Heth / David Olimpi | Porsche 911 S | Holbert's Porsche-Audi | no time |
| 71st | 138 | Paul Fleming / Roger Mandeville | Mazda RX-2 | PDF Racing | no time |
| 72nd | 32 | Roberto Boza / Daniel Hernandez / José Romero | Shelby GT500 | Roberto Auto Electric | no time |