PORSCHE RACING HISTORYBill Whittington (USA)
1980 : Sebring 12 Hours - 3rd overall : Road Atlanta 100 Miles - 1st overall
3 February 1980 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 93 | Porsche 935 K3 | 009 00015 | GTX | Bill Whittington (USA)/Don Whittington (USA)/Dale Whittington (USA) | Whittington Bros. (USA) | 16th | 8th | 1st | 509 laps - DSQ Assistance |
22 March 1980 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 93 | Porsche 935 K3 | 009 00015 | GTX | Don Whittington (USA)/Bill Whittington (USA)/Dale Whittington (USA) | Whittington Bros. (USA) | 3rd | 3rd | 3rd | 247 laps |
13 April 1980 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 95 | Porsche 935 K3 | 930 890 0023 | GTX | Bill Whittington (USA) | Whittington Bros. Racing (USA) | 1st | 1st | 3rd | 19 laps |
27 April 1980 - Riverside 5 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 935 K3 | 009 00015 | GTX | Don Whittington (USA)/Bill Whittington (USA) | Whittington Brothers Racing (USA) | 30th | 8th | 1st | 114 laps - Turbocharger |
21 September 1980 - Road Atlanta 50 Miles - Heat 1 - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935 K3 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 32nd | 16th | 4th | 2 laps - DNF |
30 November 1980 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935 K3 | 930 990 0028 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 67th | 16th | 3rd | 0 laps - DNF |