PORSCHE RACING HISTORYBill Johnson (USA)
1981 : Daytona 24 Hours - 3rd in class
1 February 1981 - Daytona 24 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 34 | Porsche 911 Carrera | GTO | George Drolsom (USA)/Rob Hoskins (USA)/Bill Johnson (USA) | Drolsom Racing (USA) | 15th | 3rd | 62nd | 563 laps |
21 March 1981 - Sebring 12 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 39 | Porsche 911 | GTU | John Higgins (USA)/Chip Mead (USA)/Bill Johnson (USA) | The Foreign Exchange | 38th | 13th | 45th | 136 laps |