PORSCHE RACING HISTORYChassis No. 930 890 0023
2 April 1978 - Talladega 6 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA)/Don Whittington (USA) | Whittington Brothers Racing (USA) | 2nd | 2nd | 13th | 167 laps |
16 April 1978 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Don Whittington (USA) | Whittington Brothers Racing (USA) | 7th | 7th | 10th | 37 laps |
30 April 1978 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 14th | 11th | 10th | 47 laps |
7 May 1978 - Hallett 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Don Whittington (USA) | Whittington Brothers Racing (USA) | 12th | 6th | 6th | 47 laps |
29 May 1978 - Lime Rock 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 2nd | 2nd | 4th | 64 laps |
18 June 1978 - Brainerd 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Don Whittington (USA) | Whittington Brothers Racing (USA) | 3rd | 3rd | 3rd | 33 laps |
30 July 1978 - Sears Point 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 23rd | 12th | 5th | 10 laps - DNF |
6 August 1978 - Portland 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 3rd | 3rd | 4th | 50 laps |
27 August 1978 - Mid Ohio 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA)/Jim Busby (USA) | Whittington Brothers Racing (USA) | 1st | 1st | 6th | 104 laps |
4 September 1978 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 3rd | 3rd | 2nd | 40 laps |
26 November 1978 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | GTX | Bill Whittington (USA) | Whittington Brothers Racing (USA) | 7th | 7th | 2nd | 62 laps |
7 July 1979 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 94 | Porsche 935/77A | 930 890 0023 | Gr.5 | Don Whittington (USA)/Klaus Ludwig (D)/Bill Whittington (USA) | Whittington Bros/Kremer Racing (USA) | 1st | 1st | 2nd | 175 laps |
23 September 1979 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 95 | Porsche 935/77A | 930 890 0023 | GTX | Dale Whittington (USA) | Whittington Brothers Racing (USA) | 9th | 9th | 33rd | 38 laps |
25 November 1979 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 95 | Porsche 935/77A | 930 890 0023 | GTX | Dale Whittington (USA) | Whittington Brothers Racing (USA) | 55th | 11th | 9th | 14 laps - DNF |
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 |
21 September 1980 - Road Atlanta 50 Miles - Heat 1 - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 95 | Porsche 935 K3 | 930 890 0023 | GTX | Dale Whittington (USA) | Whittington Brothers Racing (USA) | 2nd | 2nd | 6th | 20 laps |
21 September 1980 - Road Atlanta 50 Miles - Heat 2 - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 95 | Porsche 935 K3 | 930 890 0023 | GTX | Dale Whittington (USA) | Whittington Brothers Racing (USA) | 4th | 4th | 6th | 13 laps |
30 November 1980 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 95 | Porsche 935 K3 | 930 890 0023 | GTX | Dale Whittington (USA) | Whittington Brothers Racing (USA) | 35th | 9th | 2nd | 44 laps - DNF |
29 November 1981 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 95 | Porsche 935 K3 | 930 890 0023 | GTX | Dale Whittington (USA)/Randy Lanier (USA) | Whittington Bros (USA) | 30th | 11th | 8th | 50 laps |