| 1st | 2 | Gurney / Grant | Ford Mk II | Shelby American Inc. | 2:54.6000 | 172.5539 |
| 2nd | 27 | Parkes / Bondurant | Ferrari 330 P3 Barchetta | SpA Ferrari SEFAC | 2:56.6000 | |
| 3rd | 24 | Hill / Stewart | Ford GT40 | Alan Mann Racing | 2:57.4000 | |
| 4th | 3 | Hansgen / Donohue | Ford Mk II | Holman & Moody | 2:58.6000 | |
| 5th | 1 | Miles / Ruby | Ford X1 Roadster | Shelby American Inc. | 2:58.6000 | |
| 6th | 11 | Sharp / Hall | Chaparral 2D Chevrolet | Chaparral Cars Inc. | 2:59.6000 | |
| 7th | 25 | Whitmore / Gardner / *Amon | Ford GT40 | Alan Mann Racing | 3:00.4000 | |
| 8th | 12 | Bonnier / Hill | Chaparral 2D Chevrolet | Chaparral Cars Inc. | 3:00.6000 | |
| 9th | 26 | Rodriguez / Andretti | Ferrari 365 P2 | North American Racing Team | 3:01.2000 | |
| 10th | 4 | Foyt / Bucknum | Ford Mk II | Holman & Moody | 3:03.4000 | |
| 11th | 53 | Mitter / Klass | Porsche 906 | Porsche System Engineering | 3:03.6000 | |
| 12th | 46 | Scarfiotti / Bandini | Ferrari Dino 206 S | SpA Ferrari SEFAC | 3:05.0000 | |
| 13th | 19 | Scott / Revson | Ford GT40 | Essex Wire Corporation | 3:07.0000 | |
| 14th | 20 | Gregory / Pabst | Ford GT40 | Essex Wire Corporation | 3:08.0000 | |
| 15th | 48 | Wester / Patrick / *Jordan | Porsche 906 | Otto Zipper | 3:08.2000 | |
| 16th | 18 | McLean / Ouellet | Ford GT40 | Comstock Racing Team | 3:08.9000 | |
| 17th | 50 | Underwood / Hugus | Porsche 906 | Ed Hugus | 3:09.2000 | |
| 18th | 49 | Siffert / Vögele | Porsche 906 | Charles Vögele | 3:09.6000 | |
| 19th | 6 | Grossman / Lowther | Shelby Cobra roadster | Scuderia Bear | 3:10.8000 | |
| 20th | 21 | Ireland / Sutcliffe | Ford GT40 | Peter Sutcliffe | 3:10.8000 | |
| 21st | 10 | Thompson / Guldstrand | Chevrolet Corvette Grand Sport | Roger Penske | 3:11.0000 | |
| 22nd | 17 | Wietzes / Fisher | Ford GT40 | Comstock Racing Team | 3:11.8000 | |
| 23rd | 23 | Jennings / Holquist / *Koveleski | Ford GT40 | Scuderia Bear | 3:12.2000 | |
| 24th | 52 | Herrmann / Buzzetta / Mitter | Porsche 906 | Porsche System Engineering | 3:12.2000 | |
| 25th | 47 | Cunningham / Jordan / Fitch | Porsche 904 GTS | Briggs Cunningham | 3:18.6000 | |
| 26th | 22 | Wonder / Brown | Ford GT40 | Bill Wonder | 3:20.0000 | |
| 27th | 54 | Follmer / Gregg | Porsche 904 GTS | Porsche Germany | 3:20.8000 | |
| 28th | 9 | Wintersteen / Moore | Chevrolet Corvette Sting Ray coupe | Roger Penske | 3:21.2000 | |
| 29th | 80 | Said / Cuomo / Addison / *Payne / *Salo | Shelby Cobra | Tom Payne | 3:22.6000 | |
| 30th | 8 | Yenko / Morgan / Whims | Chevrolet Corvette Sting Ray | Harold C. Whims | 3:25.0000 | |
| 31st | 55 | Schütz / Glemser | Porsche 904 GTS | Porsche System Engineering | 3:25.8000 | |
| 32nd | 61 | Zeccoli / "Geki" | Alfa Romeo Giulia TZ2 | Autodelta SpA | 3:27.0000 | |
| 33rd | 63 | "Geki" / Andrey / *de Adamich / *Bussinello | Alfa Romeo Giulia TZ2 | Autodelta SpA | 3:27.6000 | |
| 34th | 62 | Bianchi / Consten | Alfa Romeo Giulia TZ2 | Autodelta SpA | 3:27.8000 | |
| 37th | 33 | Swanson / Ennis | Ferrari 250 LM | Arthur W. Swanson | 3:30.2000 | |
| 35th | 35 | Slottag / Perkins | Ferrari 250 GTO | Jack Slottag | 3:30.3000 | |
| 36th | 64 | Posey / Theodoracopulos | Alfa Romeo Giulia TZ2 | Filippo Theodoli | 3:30.4000 | |
| 38th | 57 | Ripley / Wetanson | Porsche 904 GTS | Wetanson & Ripley | 3:32.6000 | |
| 39th | 7 | Bentley / Latta / Byrne | Shelby Cobra 427 | Space Science Service | 3:33.0000 | |
| 40th | 56 | Duval / Kroll / *Saskal | Porsche 904 GTS | Jacques Duval | 3:34.6000 | |
| 41st | 66 | Aaltonen / Baker | Austin-Healey Sprite | Donald Healey Motor Co. | 3:38.4000 | |
| 46th | 67 | Hawkins / Mäkinen | Austin-Healey Sprite | Donald Healey Motor Co. | 3:38.4000 | |
| 42nd | 60 | Colombosian / Todd | Lotus Elan | Autolab Imports | 3:39.8000 | |
| 43rd | 31 | Hull / Kingham | Jaguar XKE | Jaguar Cars of Winter Haven | 3:40.0000 | |
| 44th | 44 | Hopkirk / Hedges / *Manton / *Brown | MGB | British Motor Co. | 3:42.4000 | |
| 45th | 51 | Ryan / Coleman / *Bencker | Porsche 911 | RBM Motors | 3:42.8000 | |
| 47th | 39 | Tullius / Gates | Triumph TR4A | Standard Triumph Motor Co. | 3:45.1000 | |
| 48th | 82 | Kohler / Reina / Biddle / *Behm | Shelby GT350 | Terry Kohler | 3:46.7000 | |
| 49th | 58 | McKemie / Opert | Elva Courier Mk IV Ford | Carl Haas Automobiles | 3:46.8000 | |
| 50th | 84 | West / Charles | MGB | Roger West | 3:46.8000 | |
| 51st | 59 | Mac / Manton / *Hedges / *Brown | MGB | British Motor Co. | 3:49.6000 | |
| 52nd | 41 | Froines / Pendleton | Triumph TR4A | Standard Triumph Motor Co. | 3:52.8000 | |
| 53rd | 40 | Gilmartin / Rothschild | Triumph TR4A | Standard Triumph Motor Co. | 3:53.0000 | |
| 54th | 85 | Ackerly / McNeill | MGB | Continental Cars Ltd. | 3:53.8000 | |
| 55th | 42 | Heimrath / Hill | Triumph TR4A | Standard Triumph Motor Co. | 3:54.0000 | |
| 56th | 36 | MacGrotty / Riley / Myers | Yenko Stinger | Ross MacGrotty Chevrolet | 3:54.4000 | |
| 57th | 69 | Sellers / Shaw | Alpine A110 Renault | Capt. Kenneth Sellers | 4:00.0000 | |
| 58th | 37 | Mims / Luke | Yenko Stinger | McMillan Ring Free Oil Co. | 4:03.2000 | |
| 59th | 68 | Hanna / Decker / *Waltman | Matra Djet MB8S Renault | Howard Hanna | 4:08.1000 | |
| 60th | 38 | Arutunoff / Crow | Lancia Flaminia Zagato | Anatoly Arutunoff | 4:11.7000 | |
| 61st | 89 | Schantz / Smith | Abarth-Simca 1300 Bialbero | Sherman S. Smith | 4:14.0000 | |
| 62nd | 43 | Hall / Costner | Morgan Plus 4 SS | Fergus Import Motors | 4:18.6000 | |
| 63rd | 65 | Baker / Kirtley | Alpine A110 Renault | Fred J. Baker | 4:55.4000 | |
| 64th | 92 | Vega / Kingham / Byrne | Triumph TR4A | John Kingham | 5:07.8000 | |
| 65th | 32 | Rodgers / Buchman / Robson | Jaguar XKE | Richard B. Robson | no time | |
| 66th | 87 | Kolb / Fulp / *Thorpe | Porsche 904/8 Bergspyder | Keymo Motors Corporation | no time | |