PORSCHE RACING HISTORYChassis No. 911 460 0042
One of 15 RSRs specially built for Roger Penske’s IROC Series 1973 - Roger Penske aquired new from Porsche
27 October 1973 - IROC Riverside 1 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 10 | Porsche 911 Carrera RSR | 911 460 0042 | Richard Petty (USA) | Roger Penske (USA) | 7th | 8th | 30 laps |
27 October 1973 - IROC Riverside 2 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 911 Carrera RSR | 911 460 0042 | A. J. Foyt (USA) | Roger Penske (USA) | 5th | 7th | 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 |