| 1 | Yenko / Lowther | Grady Davis (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+4.0 |
| 2 | Black / Wyllie | Grady Davis | | Chevrolet | Corvette | C1 | Chevrolet | GT+4.0 |
| 3 | Allen / Robertson | Red Vogt (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+4.0 |
| 4 | Johnson / Morgan | Johnson Chevrolet (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+4.0 |
| 5 | Pigott / Grant | Don Campbell | Don Campbell | Chevrolet | Corvette | C1 | Chevrolet | GT+4.0 |
| 6 | Ward / Johnson | Ronnie Kaplan (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+4.0 |
| 7 | Fuller / Washburn | Fuller Murry Race Cars | | Chevrolet | Corvette | C1 | Chevrolet | GT+4.0 |
| 9 | Panch / Maggiacomo | Holman Moody | | Ford | Falcon | Challenger | Ford | P4.0 |
| 10 | Sharp / Hall / Hissom / Daigh | Chaparral Cars Inc. (USA) | Jim Hall | Chaparral | 1 | | Chevrolet | P4.0 |
| 11 | Hall / Daigh / *Hissom | Chaparral Cars Inc. (USA) | Jim Hall | Chaparral | 1 | | Chevrolet | P4.0 |
| 14 | Cunningham / Fitch | Briggs Cunningham | | Jaguar | E-type | | Jaguar | GT4.0 |
| 15 | Todd / Todd | Scuderia Light Blue (USA) | | Warwick | GT | 350 | Buick | P4.0 |
| 20 | Constantine / Andrey | John T. Bunch (USA) | John Bunch | Ferrari | 250 TR | Fantuzzi Spyder 59/60 | Ferrari | S3.0 |
| 21 | McLaren / Penske | Briggs Cunningham (USA) | | Cooper | Monaco | T57 | Maserati | S3.0 |
| 22 | Tavano / Davis / *Bianchi | Scuderia SSS Republica di Venezia (I) | Count Giovanni Volpi | Ferrari | 250 GT | | Ferrari | GT3.0 |
| 23 | Bonnier / Bianchi / *Hill | Scuderia SSS Republica di Venezia (I) | Count Giovanni Volpi | Ferrari | 250 TRI | Fantuzzi Spyder 61 | Ferrari | S3.0 |
| 24 | Hill / Gendebien | North American Racing Team (USA) | | Ferrari | 250 GTO | | Ferrari | GT3.0 |
| 25 | Serena / Hamill | North American Racing Team (USA) | | Ferrari | 250 GT | SWB | Ferrari | GT3.0 |
| 26 | Ireland / Moss / *Fulp / *Tavano | North American Racing Team (USA) | Luigi Chinetti | Ferrari | 250 TRI | Fantuzzi Spyder 61 | Ferrari | S3.0 |
| 27 | Hayes / Haas / Dietrich / *Baxter | North American Racing Team (USA) | | Ferrari | 250 GT | SWB | Ferrari | GT3.0 |
| 28 | Hugus / Reed | Scuderia Bear | William S. McKelvy | Ferrari | 250 GT | SWB EXP | Ferrari | GT3.0 |
| 30 | Vaccarella / Abate | Scuderia SSS Republica di Venezia | | Maserati | Tipo 64 | | Maserati | S3.0 |
| 31 | Lollobrigida / Ronchieri | Sorocaima | | Maserati | 300S | | Maserati | S3.0 |
| 32 | Hansgen / Thompson | Briggs Cunningham (USA) | | Maserati | Tipo 64 | | Maserati | S3.0 |
| 33 | Wilson / Grimm / *Kilburn | Enus Wilson (USA) | Enus Wilson | Maserati | Tipo 61 | | Maserati | S3.0 |
| 34 | Rodriguez / Rodriguez | North American Racing Team (USA) | | Ferrari | Dino 246 SP | | Ferrari | S3.0 |
| 35 | Grossman / Connell / Rodriguez | North American Racing Team (USA) | | Ferrari | Dino 246 S | | Ferrari | S3.0 |
| 36 | Ryan / Fulp / *Moss / *Ireland | North American Racing Team (USA) | | Ferrari | Dino 248 SP | | Ferrari | S3.0 |
| 37 | Waltman / *Cone | George Waltmann | | Triumph | TR4 | | Triumph | GT3.0 |
| 38 | Binford / Cole | James Binford (USA) | | Triumph | TR4 | | Triumph | GT3.0 |
| 39 | Rogers / Bailey | Alton Rodgers | | Morgan | Plus 4 | Super Sports | Triumph | GT2.0 |
| 40 | Kingham / Kingham | Richard Kingham (USA) | Richard Kingham | AC | Ace | | Bristol | GT2.0 |
| 41 | Procter / Harper | Rootes Motors | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 42 | Miles / Spencer | Rootes Motors | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 43 | Sheppard / Payne / Spencer | Rootes Motors | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 44 | Theodoli / Barrette | Rootes Motors | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 45 | Donner / Sesslar / *Spencer | Rennod Race Cars (USA) | | Porsche | 718 | RSK | Porsche | S1.6 |
| 46 | Heimrath / Polivka | Eglinton Cal. Motors | | Porsche | 718 | RSK | Porsche | S1.6 |
| 47 | Smith / Whims | Elva Cars Ltd. (USA) | | Elva | Courier | | Ford | GT1.6 |
| 48 | Holbert / Gurney / *Bonnier | Porsche System Engineering (D) | | Porsche | 356 | B 1600 GS Carrera Abarth GTL | Porsche | GT1.6 |
| 49 | Barth / Strähle / *Holbert | Porsche System Engineering (D) | | Porsche | 356 | B 1600 GS Carrera Abarth GTL | Porsche | GT1.6 |
| 50 | Cassel / Lane | Continental Motors | | Porsche | 356 | B 1600 | Porsche | GT1.6 |
| 51 | Parkinson / Flaherty | Ecurie Safety Fast | | MG | A | | BMC | GT1.6 |
| 52 | Sears / Hedges | Ecurie Safety Fast (GB) | | MG | A | | BMC | GT1.6 |
| 53 | Whitmore / Olthoff / Morrill | Ecurie Safety Fast (GB) | | MG | A | | BMC | GT1.6 |
| 54 | Bolton / Rothschild | TVR Cars Ltd | | TVR | Grantura | | BMC | GT1.6 |
| 55 | Donohue / Signore | TVR Cars Ltd | | TVR | Grantura | | BMC | GT1.6 |
| 56 | Cuomo / Darling / Jacobs | TVR Cars Ltd | | TVR | Grantura | | BMC | GT1.6 |
| 57 | Lund / Walsh | Paul Lund | | Porsche | 356 | B 1600 | Porsche | GT1.6 |
| 58 | Lichtie / Publicker | North American Racing Team | | Osca | GT | 1600 | Osca | GT1.6 |
| 59 | Wuesthoff / Rand / Jennings | Porsche Imports (USA) | | Porsche | 718 | RS 60 | Porsche | S1.6 |
| 60 | Leto di Priolo / Facetti | Scuderia Ambrosiana (I) | | Alfa Romeo | Giulietta Sprint Veloce | | Alfa Romeo | GT1.3 |
| 61 | Theodoracopulos / Sala | Scuderia Ambrosiana (I) | | Alfa Romeo | Giulietta Sprint Veloce | | Alfa Romeo | GT1.3 |
| 62 | Richards / Kolb / *Norwood | Martini-Rossi Racing | | Alfa Romeo | Giulietta Sprint Zagato | | Alfa Romeo | GT1.3 |
| 63 | Swanson / Durant / Richardson | Durant-Swanson | | Alfa Romeo | Giulietta Sprint Zagato | | Alfa Romeo | GT1.3 |
| 65 | Rainville / Ballard | Jake Kaplan (USA) | | Alfa Romeo | Giulietta Sprint Zagato | | Alfa Romeo | GT1.3 |
| 66 | Mayer / Ripley | Lotus | | Lotus | Elite | | Climax | GT1.3 |
| 68 | Davis / Pulver | Duchess Auto (USA) | | Lotus | Elite | | Climax | GT1.3 |
| 69 | Hulette / Wiedner | Don Hulette | | Lotus | Elite | | Climax | GT1.3 |
| 71 | Kaback / Snow / Mayer | Lotus | | Lotus | 23 | | | S1.15 |
| 72 | McQueen / Colgate | Donald Healey Motor Co. | | Austin-Healey | Sebring Sprite | | BMC | S1.15 |
| 73 | Tweedale / Warren / Ross / *Haas | Elva Cars Ltd. (USA) | | Elva | Mk VI | | Climax | S1.15 |
| 74 | Merino / Rosales / *Ashmore | Elva Cars Ltd. (GB) | | Elva | Mk VI | | Climax | S1.15 |
| 75 | Gorstead / Schmidt | Oliver Schmidt (USA) | | De Tomaso | | | Osca | S1.15 |
| 76 | Thiele / Guichet / *Bianchi / *Richards | Abarth Corse | | Fiat-Abarth | 850 S | | Fiat | S1.15 |
| 77 | McCluggage / Eager | North American Racing Team (USA) | | Osca | S | 1000 | Osca | S1.15 |
| 78 | Knight / Becanson | Merrimac Racing | | Osca | S | 850 | Osca | S850 |
| 79 | Gordon / Bentley | Automobili Osca (I) | John Gordon | Osca | S | 750 | Osca | S850 |
| 80 | Hanna / Toland | Fran-Am Racing Team | | DB | | | Panhard | S850 |
| 81 | Manley / Newcomer | Fran-Am Racing Team | | DB | | | Panhard | S850 |
| 83 | Corrigan / Coleman | Brumos Porsche (USA) | | Porsche | 356 | A 1600 | Porsche | GT1.6 |