PORSCHE RACING HISTORYPorsche 935 K3 - Chassis No. 009 00015
1979 - Whittington Brothers
10 June 1979 - Le Mans 24 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 41 | Porsche 935 K3 | 009 00015 | Gr.5+2.0 | Bill Whittington (USA)/Klaus Ludwig (D)/Don Whittington (USA) | Porsche Kremer Racing (D) | 1st | 1st | 3rd | 307 laps |
25 November 1979 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 93 | Porsche 935 K3 | 009 00015 | GTX | Don Whittington (USA) | Whittington Brothers Racing (USA) | 2nd | 2nd | 1st | 47 laps |
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 |
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 |
15 June 1980 - Le Mans 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 85 | Porsche 935 K3 | 009 00015 | Gr.5 | Don Whittington (USA)/Hurley Haywood (USA)/Dale Whittington (USA) | Whittington Bros. (USA) | DNF | 21st | 151 laps - Differential |
5 July 1980 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 85 | Porsche 935 K3 | 009 00015 | Gr.5 | Don Whittington (USA)/Hurley Haywood (USA)/Dale Whittington (USA) | Whittington Brothers Racing (USA) | 9th | 9th | 8th | 130 laps |