PORSCHE RACING HISTORYJack Griffin (USA)
1985 : Sebring 12 Hours - 3rd in class
3 February 1985 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 35 | Porsche 911 Carrera RSR | 911 460 9113 | GTO | M. L. Speer (USA)/Bobby Hefner (USA)/Jack Griffin (USA) | Team Dallas | 31st | 12th | 60th | 395 laps - Oil Leak |
23 March 1985 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 35 | Porsche 911 Carrera RSR | 911 460 9113 | GTU | Jack Griffin (USA)/Bobby Hefner (USA)/Skip Winfree (USA) | Team Dallas | 25th | 3rd | 73rd | 178 laps |
1 December 1985 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 35 | Porsche 911 | GTU | Bobby Hefner (USA)/Jack Griffin (USA) | 33rd | 6th | 59th | 73 laps |