PORSCHE RACING HISTORYGordon Johncock (USA)
1973
27 October 1973 - IROC Riverside 1 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 11 | Porsche 911 Carrera RSR | 911 460 0085 | Gordon Johncock (USA) | Roger Penske (USA) | 10th | 9th | 28 laps |
27 October 1973 - IROC Riverside 2 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 10 | Porsche 911 Carrera RSR | 911 460 0016 | Gordon Johncock (USA) | Roger Penske (USA) | 9th | 3rd | 29 laps - Accident |
28 October 1973 - IROC Riverside 3 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 911 Carrera RSR | 911 460 0085 | Gordon Johncock (USA) | Roger Penske (USA) | 11th | 4th | 9 laps - Throttle Linkage |