PORSCHE RACING HISTORYR. D. Whittington (USA)
1978
4 September 1978 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 | GTX | R. D. Whittington (USA) | Whittington Brothers Racing (USA) | 17th | 8th | 25th | 35 laps |
26 November 1978 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 | GTX | R. D. Whittington (USA)/Dale Whittington (USA) | Whittington Brothers Racing (USA) | 56th | 20th | 22nd | 13 laps - Accident |