PORSCHE RACING HISTORYBobby Unser (USA)
b. 20 February 1934 (Colorado Springs, Colorado, US) - d. 2 May 2021 (Albuquerque, New Mexico, US)
Wikipedia
Robert William Unser
1973 19741973 : IROC Riverside 1 - 2nd : IROC Riverside 3 - 2nd
27 October 1973 - IROC Riverside 1 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 911 Carrera RSR | 911 460 0116 | Bobby Unser (USA) | Roger Penske (USA) | 2nd | 5th | 30 laps |
27 October 1973 - IROC Riverside 2 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 911 Carrera RSR | 911 460 0035 | Bobby Unser (USA) | Roger Penske (USA) | 6th | 11th | 30 laps |
28 October 1973 - IROC Riverside 3 - IROC - International Race of Champions
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 911 Carrera RSR | 911 460 0116 | Bobby Unser (USA) | Roger Penske (USA) | 2nd | 7th | 30 laps |