PORSCHE RACING HISTORYJoseph Hamilton (USA)
1980
3 February 1980 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 52 | Porsche 911 S | GTU | Joseph Hamilton (USA)/Tom Cripe (USA)/Fred Snow (USA) | Snowmobile Racing | 38th | 12th | 63rd | 301 laps - Accident |
22 March 1980 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 28 | Porsche 911 S | GTO | Robert Overby (USA)/Joseph Hamilton (USA)/Herb Forrest (USA) | Hamilton House Racing (USA) | 75th | 33rd | 32nd | 12 laps - DNF |