PORSCHE RACING HISTORY1983 - Trans-Am Road America
31 July 1983 - Road America, USA
Ludwig Heimrath, Sr fourth in a Porsche 935
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 935 | 930 770 0958 | Ludwig Heimrath, Sr (CDN) | Heimrath Racing (CDN) | 4th | 9th | 25 laps | ||
| 91 | Porsche 934 | John Klug (USA) | John Klug Racing (USA) | 27th | 42nd | 24 laps | |||
| 36 | Porsche 924 Carrera GTR | Paul Miller (USA) | Paul Miller (USA) | 34th | 5th | 19 laps - Oil Pump | |||
| 34 | Porsche 924 Carrera GTR | George Drolsom (USA) | Rexroat Porsche/Audi (USA) | 54th | 56th | 1 lap |
Trans-Am
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