PORSCHE RACING HISTORYWilliam Vollery (CH)
1974
24 March 1974 - Le Mans 4 Hours - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 37 | Porsche 911 Carrera RSR | GT | William Vollery (CH)/Eric Chapuis (CH) | Porsche Club Romand (CH) | DNF | 15th | 38 laps |
16 June 1974 - Le Mans 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 67 | Porsche 911 Carrera RSR | 911 360 0960 | GTS3.0 | William Vollery (CH)/Eric Chapuis (CH)/Roger Dorchy (F) | Porsche Club Romand (CH) | DNF | 42nd | 225 laps - Engine |