PORSCHE RACING HISTORYBill Koll (USA)
1981 : Daytona 24 Hours - 3rd overall, 1st in class
1 February 1981 - Daytona 24 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 911 SC | GTU | Bill Koll (USA)/Jeff Kline (USA)/Rob McFarlin (USA) | Kegel Enterprises (USA) | 3rd | 1st | 31st | 644 laps |
21 March 1981 - Sebring 12 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 911 S | GTU | Bill Koll (USA)/Jeff Kline (USA) | Kegel Enterprises (USA) | 43rd | 15th | 28th | 121 laps - DNF |
26 April 1981 - Riverside 6 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 62 | Porsche 911 SC | GTU | Bill Koll (USA)/Jeff Kline (USA) | Kegel Enterprises (USA) | 22nd | 6th | 29th | 158 laps |