PORSCHE RACING HISTORYRay Mummery (USA)
1977 : Sebring 12 Hours - 2nd in class
6 February 1977 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | 304 823 | GTU | Ray Mummery (USA)/Jack Refenning (USA)/Ralph Noseda (USA) | SVD Automotive | 12th | 5th | 51st | 581 laps |
19 March 1977 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | 304 823 | GTU | Ray Mummery (USA)/Jack Refenning (USA)/Joseph Hamilton (USA) | Miami Auto Racing | 9th | 2nd | 70th | 203 laps |
17 April 1977 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | GTU | Ray Mummery (USA) | Miami Auto Racing | 33rd | 9th | 21st | 6 laps - DNF |
15 May 1977 - Mid-America 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 27 | Porsche 911 S | GTU | Ray Mummery (USA) | Miami Auto Racing | 12th | 4th | 16th | 31 laps |