PORSCHE RACING HISTORYBilly Sprowls (USA)
1976
1 February 1976 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 97 | Porsche 911 Carrera RSR | 911 360 1099 | GTO | Juan Carlos Bolaños (MEX)/Billy Sprowls (USA)/Gustavo Bolanos (MEX) | Juan Carlos Bolanos (MEX) | 31st | 14th | 27th | 318 laps - DNF |
20 March 1976 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 91 | Porsche 911 Carrera RSR | 911 360 1099 | GTO | Juan Carlos Bolaños (MEX)/Billy Sprowls (USA)/Eduardo Lopez Negrete (MEX) | Adams Apple (MEX) | 11th | 10th | 17th | 206 laps |
13 June 1976 - Le Mans 24 Hours - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 47 | Porsche 935 K1 | 006 00019 | GP.5 | Juan Carlos Bolaños (MEX)/Hans Heyer (D)/Billy Sprowls (USA) | Porsche Kremer Racing (D) | DNF | 11th | 272 laps - Fire |