PORSCHE RACING HISTORYChassis No. 917-031
11 October 1970 - Zeltweg 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 23 | Porsche 917 K | 917-031 | S5.0 | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive (GB) | 1st | 1st | 5th | 170 laps |
20 March 1971 - Sebring 12 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 917 K | 917-031 | S | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive Engineering Ltd. (GB) | 5th | 3rd | 6th | 244 laps |
13 June 1971 - Le Mans 24 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 19 | Porsche 917 K | 917-031 | S5.0 | Richard Attwood (GB)/Herbert Müller (CH) | John Wyer Automotive Engineering (GB) | 2nd | 2nd | 11th | 395 laps |