PORSCHE RACING HISTORYBill Koll (USA)
1979 : Riverside 6 Hours - 3rd in class : Brainerd 100 Miles - 2nd in class
4 February 1979 - 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) | Koll Motorsports (USA) | 17th | 7th | 39th | 511 laps - DNF |
17 March 1979 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 914/6 | 914 043 0593 | GTU | Bill Koll (USA)/Jim Cook (USA)/Dennis Aase (USA) | Koll Motor Sports (USA) | 22nd | 6th | 20th | 182 laps |
22 April 1979 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 914/6 | 914 043 0593 | GTU | Bill Koll (USA)/Bill Bean (USA) | Koll Motor Sports (USA) | 13th | 3rd | 31st | 174 laps |
17 June 1979 - Brainerd 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 914/6 | 914 043 0593 | GTU | Bill Koll (USA) | Koll Motor Sports (USA) | 22nd | 2nd | 16th | 29 laps |
4 July 1979 - Daytona Paul Revere 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 914/6 | 914 043 0593 | GTU | Bill Koll (USA)/Jim Cook (USA) | Koll Motor Sports (USA) | 16th | 5th | 31st | 56 laps |
15 July 1979 - Mid-Ohio 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 914/6 | 914 043 0593 | GTU | Bill Koll (USA)/Jim Cook (USA) | Koll Motor Sports (USA) | 29th | 9th | 24th | 58 laps - DNF |
2 September 1979 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 914/6 | 914 043 0593 | GTU | Bill Koll (USA)/Jim Cook (USA) | Koll Motor Sports (USA) | 13th | 4th | 24th | 112 laps |