PORSCHE RACING HISTORYJoseph Hamilton (USA)
1979
4 February 1979 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 89 | Porsche 911 S | GTU | Joseph Hamilton (USA)/Rob Hoskins (USA)/Herb Forrest (USA) | Hamilton House Racing (USA) | 35th | 16th | 46th | 329 laps - DNF |
4 July 1979 - Daytona Paul Revere 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 88 | Porsche 911 S | GTU | Joseph Hamilton (USA)/Robert Overby (USA) | Hamilton House Racing | 39th | 14th | 35th | 18 laps |
25 November 1979 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 89 | Porsche 911 S | GTU | Joseph Hamilton (USA) | Hamilton House Racing | 49th | 18th | 54th | 19 laps - DNF |