| 1 | Yenko / Moore | Yenko Chevrolet (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+3.0 |
| 1P | | Yenko Chevrolet (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+3.0 |
| 2 | Reardon / Kilborn | Yenko Chevrolet (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+3.0 |
| 3 | Robertson / Burroughs / Warren | Red Vogt (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+3.0 |
| 4 | Johnson / Morgan | Johnson Chevrolet (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+3.0 |
| 5 | Moore / Johnson | Glenn Campbell Chevrolet (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+3.0 |
| 7 | Grossman / Black | David Ash (USA) | | Aston Martin | DB4 GT | | Aston Martin | GT+3.0 |
| 8 | Decker / Bucher | David Ash (USA) | | Aston Martin | DB4 GT | | Aston Martin | GT+3.0 |
| 9 | Lovely / Nethercutt | Jack Nethercutt (USA) | Jack Nethercutt | Ferrari | 250 TR | Fantuzzi Spyder 59 | Ferrari | S3.0 |
| 10 | Sharp / Hissom | Hap Sharp (USA) | Hap Sharp | Ferrari | 250 TR | Fantuzzi Spyder 59 | Ferrari | S3.0 |
| 11 | Tavano / Arents / *Serena | Scuderia Serenissima (I) | Kent Price | Ferrari | 250 GT | SWB Berlinetta | Ferrari | GT3.0 |
| 12 | McCluggage / Eager | Denise McCluggage (USA) | Denise McCluggage | Ferrari | 250 GT | SWB Berlinetta | Ferrari | GT3.0 |
| 14 | Hill / Gendebien | Sefac Automobile Ferrari (I) | Enzo Ferrari | Ferrari | 250 TRI | Fantuzzi Spyder 61 | Ferrari | S3.0 |
| 15 | Baghetti / Mairesse / Ginther / von Trips / *Rodriguez | Sefac Automobile Ferrari (I) | Enzo Ferrari | Ferrari | 250 TRI | Fantuzzi Spyder 60/61 | Ferrari | S3.0 |
| 16 | Reed / Sturgis | McCook Window Company (USA) | George Reed | Ferrari | 250 TR | Fantuzzi Spyder 59/60 | Ferrari | S3.0 |
| 17 | Rodriguez / Rodriguez | NART (USA) | Luigi Chinetti | Ferrari | 250 TR | Fantuzzi Spyder 59/60 | Ferrari | S3.0 |
| 18 | Andrey / Newman / Publicker | Scuderia Serenissima (I) | Count Giovanni Volpi | Ferrari | 250 GT | California | Ferrari | GT3.0 |
| 20 | Hansgen / McLaren | Momo Corporation (USA) | | Maserati | Tipo 63 | | Maserati | S3.0 |
| 21 | Fitch / Thompson | Momo Corporation (USA) | Briggs Cunningham | Maserati | Tipo 61 | | Maserati | S3.0 |
| 22 | Hall / Constantine | NART (USA) | | Ferrari | Dino 246 S | | Ferrari | S2.5 |
| 23 | Moss / Hill / *Casner / *Lilley / *Gregory | Camoradi International (USA) | Lloyd Casner | Maserati | Tipo 61 | | Maserati | S3.0 |
| 24 | Gregory / Casner / Moss / *Hudson / *Hill | Camoradi International (GB) | | Maserati | Tipo 63 | | Maserati | S3.0 |
| 25 | Causey / Stear | Rallye Motors (USA) | Dave Causey | Maserati | Tipo 61 | | Maserati | S3.0 |
| 26 | Hugus / Connell | NART (USA) | | Ferrari | Dino 246 S | | Ferrari | S2.5 |
| 27 | Ginther / von Trips | Sefac Automobile Ferrari (I) | | Ferrari | Dino 246 SP | | Ferrari | S2.5 |
| 28 | Williamson / Waltman | George Waltman (USA) | | Triumph | TR3 | | Triumph | GT2.0 |
| 29 | Rushin / Parsons | Suburban Foreign Cars (USA) | | Triumph | TR3 | | Triumph | GT2.0 |
| 30 | Rogers / Bailey | Salter Auto Imports (USA) | | Morgan | 4/4 | | Triumph | GT2.0 |
| 31 | Cunningham / Kimberly / Hansgen / *Heuer | Momo Corporation (USA) | Briggs Cunningham | Maserati | Tipo 60 | | Maserati | S2.0 |
| 32 | Goldman / Durbin | S. H. Arnolt (USA) | | Arnolt-Bristol | Deluxe | | Bristol | GT2.0 |
| 33 | Payne / Cuomo / *Gary | S. H. Arnolt (USA) | | Arnolt-Bristol | Deluxe | | Bristol | GT2.0 |
| 35 | May / Johnston | A.C. Cars Ltd. (GB) | | AC | Ace | | Bristol | GT2.0 |
| 36 | Laughton / Bowers / *O'Sullivan | A.C. Cars Ltd. (GB) | | AC | Ace | | Bristol | GT2.0 |
| 37 | Helburn / Hudson / Fulp | NART (USA) | | Ferrari | Dino 196 S | | Ferrari | S2.0 |
| 38 | Wuesthoff / Pabst / *Schmidt | Porsche Car Import (USA) | | Porsche | 718 | RS 60 | Porsche | S1.6 |
| 39 | Ryan / Bradley / Heimrath | Eglinton Caledonia Motors (CDN) | | Porsche | 718 | RS 60 | Porsche | S1.6 |
| 40 | Hopkirk / Jopp | Rootes Motors, Inc. (USA) | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 41 | Wilson / Tamburo | Rootes Motors, Inc. (USA) | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 42 | Procter / Harper / Olthoff | Jack Brabhams Motors (GB) | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 43 | Riley / Whitmore | British Motors Corp. (USA) (USA) | | MG | A | | BMC | GT1.6 |
| 44 | Flaherty / Parkinson | British Motors Corp. (USA) (USA) | | MG | A | | BMC | GT1.6 |
| 45 | Horn / Tucker | Carl Haas Automotive (USA) | | Elva | Courier | | Ford | GT1.6 |
| 46 | Gelder / McClure / Fuller / *Dennis | Carl Haas Automotive (USA) | | Elva | Courier | | Ford | GT1.6 |
| 47 | Sesslar / Donner / Erickson | Bob Donner (USA) | | Porsche | 718 | RS 61 | Porsche | S1.6 |
| 48 | Cassel / Lane / *Dusinberrie | Association Automovilisti Santaneca (ES) | | Porsche | 718 | RS 61 | Porsche | S1.6 |
| 49 | Bonnier / Gurney | Porsche Auto (D) | | Porsche | 718 | RS 61 | Porsche | S2.0 |
| 50 | Herrmann / Barth / *von Hanstein | Porsche Auto (D) | | Porsche | 718 | RS 61 | Porsche | S2.0 |
| 51 | Holbert / Penske | Brumos Porsche Company (USA) | Jan Brundage | Porsche | 718 | RS 61 | Porsche | S1.6 |
| 53 | Publicker / Kolb | Robert Publicker (USA) | | Lotus | 19 | | Climax | S2.5 |
| 55 | Theodoli / Barrette | Filippo Theodoli (USA) | | Sunbeam | Alpine | | Sunbeam | GT1.6 |
| 56 | Rainville / Kaplan | Jake Kaplan (USA) | | Alfa Romeo | Giulietta Sprint Speciale | | Alfa Romeo | GT1.3 |
| 57 | Troiano / Theodoracopulos / *Comito | Lou Comito (USA) | | Alfa Romeo | Giulietta Sprint Zagato | | Alfa Romeo | GT1.3 |
| 58 | Durant / Swanson | Arthur Swanson (USA) | | Alfa Romeo | Giulietta Spider Veloce | | Alfa Romeo | GT1.3 |
| 59 | Jacobson / O'Brien / O'Brien | Thomas O'Brien (USA) | | Alfa Romeo | Giulietta Sprint Speciale | | Alfa Romeo | GT1.3 |
| 60 | Van Beuren / Sales / *Rebaque, Sr. | Autosport S. A. (MEX) | | Alfa Romeo | Giulietta Sprint Speciale | | Alfa Romeo | GT1.3 |
| 63 | Hall / Ross | Lola America (USA) | | Lola | Mk.1 | | Climax | S1.15 |
| 64 | Kurtz / Ripley | Lola America (USA) | | Lola | Mk.1 | | Climax | S1.15 |
| 65 | Leavens / Colgate | Donald Healey (GB) | | Austin-Healey | Sebring Sprite | | BMC | S1.15 |
| 66 | Buzzetta / Carlson | Donald Healey (GB) | | Austin-Healey | Sebring Sprite | | BMC | S1.15 |
| 67 | Simson / Hawkins / *Sprinzel | John Sprinzel (GB) | | Austin-Healey | Sebring Sprite | | BMC | S1.15 |
| 68 | Taylor / Calhoun / *Washburn / *Giertz | Abarth DFL Co. (USA) | | Fiat-Abarth | 1000 S | | Fiat | S1.15 |
| 69 | Cunningham / Price / Fleming | NART (USA) | | Osca | S | 1000 | Osca | S850 |
| 70 | Beach / Grady / Bentley | Begra Cars (USA) | | Begra | Mk II | | Saab | S850 |
| 71 | Peck / Hoffman / Richardson | Clearwater Motors (USA) | George Peck | Osca | S | 750 | Osca | S850 |
| 72 | Hanna / Manley | YBH Sales (USA) | | DB | Le Mans | | Panhard | S850 |
| 80 | Giertz / Liess / *Calhoun / *Dee / *Taylor | Abarth DFL Co. (USA) | | Fiat-Abarth | Record Monza | | Fiat | S1.15 |
| 83 | Gates / Heuer / *Rickert / *Andrey | Bud Gates, Inc. (USA) | | Chevrolet | Corvette | C1 | Chevrolet | GT+3.0 |
| 86 | Swan / Johnson | Lester Castings (USA) | | Porsche | 718 | RSK | Porsche | S1.6 |
| 87 | Seaverns / Gary / *Cuomo | S. H. Arnolt (USA) | | Arnolt-Bristol | Deluxe | | Bristol | GT2.0 |