| 1955 | Abandono | 14 | Ferrari 750 M | Mike Sparken/Masten Gregory |
| 1957 | 6º (6º 3001/5000) | 4 | Jaguar D-Type | Duncan Hamilton/Masten Gregory |
| 1958 | Abandono | 6 | Jaguar D-Type | Jack Fairman/Masten Gregory |
| 1959 | Abandono | 3 | Jaguar D-Type "Modified" | Masten Gregory/Innes Ireland |
| 1960 | Abandono | 24 | Maserati Tipo 61 Birdcage | Chuck Daigh/Masten Gregory |
| 1961 | 5º (1º Sport 1601/2000) | 33 | Porsche 718 RS 61/4 Spyder | Masten Gregory/Bob Holbert |
| 1962 | Abandono | 20 | Ferrari 250 GTO | Innes Ireland/Masten Gregory |
| 1963 | 6º (2º GT 2001/3000) | 26 | Ferrari 250 GTO | Masten Gregory/David Piper |
| 1964 | Abandono | 11 | Ford GT 40 | Richie Ginther/Masten Gregory |
| 1965 | 1º | 21 | Ferrari 250 LM | Jochen Rindt/Masten Gregory |
| 1966 | Abandono | 18 | Ferrari 365 P2 "White Elephant" | Masten Gregory/Bob Bondurant |
| 1968 | Abandono | 14 | Ferrari 250 LM | Masten Gregory/Charlie Kolb |
| 1969 | Abandono | 2 | Lola T70 | Jo Bonnier/Masten Gregory |
| 1970 | Abandono | 37 | Alfa Romeo T 33/3 | Toine Hezemans/Masten Gregory |
| 1971 | Abandono | 14 | Ferrari 512 S Spyder | George Eaton/Masten Gregory |
| 1972 | Abandono | 57 | Ferrari 365 GTB 4 | Luigi Chinetti Jr./Masten Gregory |
(Estados Unidos da América) 