PORSCHE RACING HISTORYDenny Hulme (NZ)
1973
27 October 1973 - IROC Riverside 1 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 911 Carrera RSR | 911 460 0075 | Denny Hulme (NZ) | Roger Penske (USA) | 5th | 4th | 30 laps |
27 October 1973 - IROC Riverside 2 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 911 Carrera RSR | 911 460 0090 | Denny Hulme (NZ) | Roger Penske (USA) | 8th | 8th | 30 laps |
28 October 1973 - IROC Riverside 3 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 8 | Porsche 911 Carrera RSR | 911 460 0042 | Denny Hulme (NZ) | Roger Penske (USA) | 8th | 5th | 30 laps |