PORSCHE RACING HISTORYBob Garretson (USA)
1979 : Sebring 12 Hours - 3rd overall : Le Mans 24 Hours - 3rd in class
17 March 1979 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 935 | 930 770 0959 | GTX | Bob Garretson (USA)/Gary Belcher (USA)/Bob Bondurant (USA) | Dick Barbour Racing (USA) | 3rd | 3rd | 7th | 235 laps |
22 April 1979 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 4 | Porsche 935 | 930 770 0959 | GTX | Skeeter McKitterick (USA)/Bob Garretson (USA)/Gary Belcher (USA) | Dick Barbour Racing (USA) | 9th | 7th | 12th | 179 laps |
10 June 1979 - Le Mans 24 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 72 | Porsche 935 | 930 770 0910 | IMSA+2.5 | Edwin Abate (USA)/Bob Garretson (USA)/Skeeter McKitterick (USA) | Dick Barbour (USA) | 8th | 3rd | 54th | 279 laps |
7 July 1979 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 72 | Porsche 935 | 930 770 0910 | TA-II | Skeeter McKitterick (USA)/Buzz Marcus (USA)/Bob Garretson (USA) | Dick Barbour Performance (USA) | 9th | 4th | 16th | 161 laps |
2 September 1979 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 4 | Porsche 935 | 930 890 0024 | GTX | Skeeter McKitterick (USA)/Bob Garretson (USA) | Dick Barbour Racing (USA) | 19th | 7th | 5th | 106 laps |