PORSCHE RACING HISTORYChuck Grantham (USA)
1982
31 January 1982 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 42 | Porsche 911 S | 119 220 830 | GTU | Gary Wonzer (USA)/Bill Bean (USA)/Chuck Grantham (USA) | Gary Wonzer | 41st | 9th | 46th | 361 laps |
20 March 1982 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 42 | Porsche 911 S | 119 220 830 | GTU | Gary Wonzer (USA)/Bill Bean (USA)/Chuck Grantham (USA) | Gary Wonzer | 25th | 8th | 40th | 164 laps - Engine |