PORSCHE RACING HISTORYBob Garretson (USA)
1978 : Sebring 12 Hours - 1st overall
18 March 1978 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 | 930 890 0037 | GTX | Brian Redman (GB)/Charles Mendez (USA)/Bob Garretson (USA) | Dick Barbour Performance (USA) | 1st | 1st | 5th | 240 laps |
11 June 1978 - Le Mans 24 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 935/77A | 930 890 0033 | IMSA+2.5 | Bob Garretson (USA)/Bob Akin (USA)/Steve Earle (USA) | Dick Barbour Racing (USA) | DNF | 31st | 159 laps - Accident |