PORSCHE RACING HISTORYChassis No. 911 460 0050
One of 15 RSRs specially built for Roger Penske’s IROC Series and is one of just a few of the 15 RSRs that competed in all four of the races. 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 |
| 8 | Porsche 911 Carrera RSR | 911 460 0050 | A. J. Foyt (USA) | Roger Penske (USA) | 6th | 6th | 30 laps |
27 October 1973 - IROC Riverside 2 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 911 Carrera RSR | 911 460 0050 | Richard Petty (USA) | Roger Penske (USA) | 10th | 6th | 29 laps - Accident |
28 October 1973 - IROC Riverside 3 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 911 Carrera RSR | 911 460 0050 | Emerson Fittipaldi (BR) | Roger Penske (USA) | 3rd | 10th | 30 laps |
14 February 1974 - IROC Daytona - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 911 Carrera RSR | 911 460 0050 | Peter Revson (USA) | Roger Penske (USA) | 2nd | 2nd | 25 laps |