PORSCHE RACING HISTORYTom Sheehy (USA)
1978 : Daytona Finale 250 Miles - 2nd in class
18 March 1978 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | GTU | Ray Mummery (USA)/Jack Refenning (USA)/Tom Sheehy (USA) | Miami Auto Racing | 52nd | 23rd | 50th | 70 laps - Clutch |
2 April 1978 - Talladega 6 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | GTU | Ray Mummery (USA)/Jack Refenning (USA)/Tom Sheehy (USA) | Ray Mummery | 15th | 5th | 26th | 142 laps |
29 May 1978 - Lime Rock 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 | GTO | Tom Sheehy (USA) | 21st | 7th | 25th | 55 laps |
26 November 1978 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | GTU | Ray Mummery (USA)/Tom Sheehy (USA) | Miami Auto Racing | 24th | 2nd | 55th | 56 laps |