PORSCHE RACING HISTORYTom Spalding (USA)
1978 : Sebring 12 Hours - 3rd overall
18 March 1978 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 13 | Porsche 935 | 930 670 0180 | GTX | Hal Shaw, Jr. (USA)/Tom Spalding (USA) | Ore House - Vail (USA) | 3rd | 3rd | 8th | 239 laps |
2 April 1978 - Talladega 6 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 13 | Porsche 935 | 930 670 0180 | GTX | Tom Spalding (USA)/Hal Shaw, Jr. (USA) | Hal Shaw Racing (USA) | 23rd | 9th | 7th | 127 laps |