PORSCHE RACING HISTORYPreston Henn (USA)
1980
22 March 1980 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935 K3 | 930 890 0021 | GTX | John Paul Sr. (USA)/Preston Henn (USA)/Al Holbert (USA) | Thunderbird Swap Shop (USA) | 4th | 4th | 11th | 239 laps |
13 April 1980 - Road Atlanta 100 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 930 890 0021 | GTX | Preston Henn (USA) | Preston Henn (USA) | 24th | 13th | 14th | 16 laps - DNF |
27 April 1980 - Riverside 5 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935 K3 | 930 890 0021 | GTX | John Paul Sr. (USA)/Preston Henn (USA) | John Paul Racing (USA) | 57th | 19th | 9th | 19 laps - Blown Engine |
25 May 1980 - Nürburgring 1000 km - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 935 JLP-2 | 009 00043 | Gr.5 | Brian Redman (GB)/Preston Henn (USA)/John Paul Sr. (USA) | JLP Racing (USA) | DNF | 13th | 27 laps - DNF |
5 July 1980 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 73 | Porsche 935 JLP-2 | 009 00043 | Gr.5 | John Paul Sr. (USA)/John Paul, Jr. (USA)/Preston Henn (USA) | JLP Racing (USA) | 14th | 13th | 10th | 116 laps |
17 August 1980 - Mosport 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 930 890 0021 | GTX | Dale Whittington (USA)/Preston Henn (USA) | Thunderbird Racing (USA) | 9th | 8th | 12th | 219 laps - Spin |
31 August 1980 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935 K3 | 930 890 0021 | GTX | Dale Whittington (USA)/Preston Henn (USA) | Preston Henn (USA) | 4th | 4th | 6th | 121 laps |
21 September 1980 - Road Atlanta 50 Miles - Heat 1 - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 8 | Porsche 935 | GTX | Preston Henn (USA) | 10th | 10th | 14th | 19 laps |
30 November 1980 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 935 K3 | 930 890 0021 | GTX | Preston Henn (USA) | Preston Henn (USA) | 57th | 14th | 6th | 11 laps - DNF |