PORSCHE RACING HISTORYRay Mummery (USA)
1979
4 February 1979 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | GTU | Ray Mummery (USA)/Tom Sheehy (USA)/Luis Sereix (USA) | Miami Auto Racing | 16th | 6th | 44th | 522 laps - Differential |
17 March 1979 - 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)/Tom Sheehy (USA)/Luis Sereix (USA) | Miami Auto Racing | 49th | 18th | 43rd | 80 laps - DNF |
4 July 1979 - Daytona Paul Revere 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | GTU | Ray Mummery (USA) | 17th | 6th | 40th | 56 laps |