PORSCHE RACING HISTORYGerhard Koch (D)
1964 : Nürburgring 1000 km - 3rd overall, 1st in class : Reims 12 Hours - 2nd in class
31 May 1964 - Nürburgring 1000 km - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 45 | Porsche 904 GTS | 904-055 | GT2.0 | Gerhard Koch (D)/Ben Pon (NL) | Racing Team Holland (NL) | 3rd | 1st | 12th | 43 laps |
22 June 1964 - Le Mans 24 Hours - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 904 GTS | 904-006 | GT2.0 | Gerhard Koch (D)/Heinz Schiller (CH) | Porsche System Engineering (D) | 10th | 4th | 30th | 319 laps |
5 July 1964 - Reims 12 Hours - World Sports Car Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 42 | Porsche 904 GTS | GT2.0 | Gerhard Koch (D)/Gerhard Mitter (D) | Porsche System (D) | 6th | 2nd | 20th | 271 laps |