PORSCHE RACING HISTORYPreston Henn (USA)
1984
24 March 1984 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 935 K4 | K4-01 | GTP | Bob Wollek (F)/John Graham (CDN)/Hugo Gralia (USA)/Preston Henn (USA) | John Fitzpatrick Racing (GB) | 6th | 6th | 6th | 246 laps |
17 June 1984 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 61 | Porsche 962 | 962-104 | GTP | Preston Henn (USA)/Edgar Dören (D)/Michel Ferté (F) | Preston Henn | DNF | 27th | 247 laps - Ignition |
25 November 1984 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 16 | Porsche 935 L | 935 L | GTP | Preston Henn (USA) | Henn's Swap Shop (USA) | 72nd | 31st | 24th | 8 laps - DNF |