PORSCHE RACING HISTORYClemens Schickentanz (D)
1983 : Monza 1000 km - 3rd overall
10 April 1983 - Monza 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Rolf Stommelen (D)/Clemens Schickentanz (D)/Hans Heyer (D) | Joest Racing | 3rd | 3rd | 7th | 170 laps |
8 May 1983 - Silverstone 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Hans Heyer (D)/Clemens Schickentanz (D)/Volkert Merl (D) | Joest Racing | DNF | 7th | 74 laps - Engine |
19 June 1983 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Volkert Merl (D)/Clemens Schickentanz (D)/Mauricio DeNarváez (COL) | Joest Racing | 4th | 4th | 9th | 361 laps |
2 October 1983 - Fuji 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 8 | Porsche 956 | 956-111 | C | Kenji Takahashi (J)/Clemens Schickentanz (D) | Brun Speedbox Motorsport | 6th | 6th | 6th | 203 laps |