PORSCHE RACING HISTORYTom Alan Marx (USA)
1983
24 April 1983 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 911 Carrera RSR | GTO | Tom Alan Marx (USA)/Dennis Lanfre (USA)/Connie Fern (USA) | RSR Associates (USA) | 30th | 12th | 47th | 105 laps - DNF |
24 July 1983 - Sears Point 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 911 Carrera RSR | GTO | Tom Alan Marx (USA)/Bill Follmer (USA) | RSR Associates (USA) | 22nd | 6th | 24th | 63 laps - DNF |
31 July 1983 - Portland 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 31 | Porsche 911 Carrera RSR | GTO | Tom Alan Marx (USA)/Bill Follmer (USA) | Marx-Lanfre Racing (USA) | 14th | 5th | 33rd | 128 laps |