PORSCHE RACING HISTORYPorsche 956 - Chassis No. 956-103
8 May 1983 - Silverstone 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 47 | Porsche 956 | 956-103 | C | Preston Henn (USA)/Guy Edwards (GB)/Rupert Keegan (GB) | Henns' T-Bird Swap Shop | DNF | 11th | 54 laps - Engine |
19 June 1983 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 47 | Porsche 956 | 956-103 | C | Preston Henn (USA)/Claude Ballot-Léna (F)/Jean-Louis Schlesser (F) | Henns' T-Bird Swap Shop | 10th | 10th | 23rd | 327 laps |
2 October 1983 - Fuji 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 48 | Porsche 956 | 956-103 | C | Preston Henn (USA)/Kunimitsu Takahashi (J)/John Paul, Jr. (USA) | Alpha Racing | DNF | 9th | 64 laps - Contact |
17 June 1984 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 26 | Porsche 956 | 956-103 | C1 | Jean Rondeau (F)/John Paul, Jr. (USA) | Preston Henn | 2nd | 2nd | 26th | 357 laps |
30 September 1984 - Fuji 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 16 | Porsche 956 | 956-103 | C1 | Chikage Oguchi (J)/Jiro Yoneyama (J) | Nova Engineering | DNF | 14th | 44 laps - Gearbox |