PORSCHE RACING HISTORYJoseph Hamilton (USA)
1977 : Sebring 12 Hours - 2nd in class
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 |