PORSCHE RACING HISTORYJo Siffert (CH)
b. 7 July 1936 (Fribourg, Switzerland) - d. 24 October 1971 (Brands Hatch, Kent, England)
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Joseph Siffert
1964 1966 1967 1968 1969 1970 19711964 : Nürburgring 1000 km - 3rd in class
31 May 1964 - Nürburgring 1000 km - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 65 | Porsche 904 GTS | 904-069 | GT2.0 | Jo Siffert (CH)/Heinz Schiller (CH) | Team Schiller (CH) | 8th | 3rd | 17th | 42 laps |
5 July 1964 - Reims 12 Hours - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 41 | Porsche 904 GTS | 904-022 | GT2.0 | Jo Siffert (CH)/Heinz Schiller (CH) | Heinz Schiller (CH) | DNF | 19th | Clutch |