PORSCHE RACING HISTORYBill Johnson (USA)
1980
22 March 1980 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 34 | Porsche 911 | GTU | George Drolsom (USA)/Bill Johnson (USA)/Rob Hoskins (USA) | Drolsom Racing (USA) | 18th | 5th | 76th | 206 laps |
27 April 1980 - Riverside 5 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 28 | Porsche 914/6 | 473 29 24107 | GTU | Bob Zulkowski (USA)/Bill Johnson (USA) | Metal Craft Racing (USA) | 39th | 15th | 57th | 67 laps |
31 August 1980 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 34 | Porsche 911 | GTU | George Drolsom (USA)/Bill Johnson (USA) | Drolsom Racing (USA) | 18th | 5th | 42nd | 103 laps |