PORSCHE RACING HISTORYBob Harmon (USA)
1978
18 March 1978 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 911 Carrera RSR | GTX | Bill Freeman (USA)/Bob Harmon (USA)/Byron Leydecker (USA) | Bill Freeman Racing | 54th | 14th | 72nd | 62 laps - Mechanical |
30 July 1978 - Sears Point 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 75 | Porsche 911 Carrera RSR | 911 360 0601 | GTX | Bob Harmon (USA) | 9th | 8th | 17th | 38 laps |