PORSCHE RACING HISTORYBill Koll (USA)
1980 : Daytona 24 Hours - 1st in class
3 February 1980 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 914/6 | 914 043 0593 | GTU | Bill Koll (USA)/Jim Cook (USA)/Greg LaCava (USA) | William J. Koll (USA) | 5th | 1st | 48th | 632 laps |
27 April 1980 - Riverside 5 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 45 | Porsche 914/6 | 914 043 0593 | GTU | Ray Ratcliff (USA)/Bill Koll (USA) | R. F. Ratcliff (USA) | 21st | 6th | 49th | 137 laps |
17 August 1980 - Mosport 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 911 | GTU | Bill Koll (USA)/Jim Cook (USA) | Koll Motor Sport (USA) | 16th | 4th | 26th | 202 laps |
31 August 1980 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 911 | GTU | Bill Koll (USA)/Jim Cook (USA) | Koll Motor Sports (USA) | 33rd | 13th | 25th | 58 laps - DNF |
30 November 1980 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 911 | GTU | Bill Koll (USA) | Koll Motor Sports (USA) | 62nd | 22nd | 36th | 3 laps - DNF |