PORSCHE RACING HISTORYChassis No. 935 L
25 April 1982 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 935 L | 935 L | GTP | Al Holbert (USA)/Harald Grohs (D) | Andial/Meister Racing (USA) | 2nd | 2nd | 46th | 190 laps |
28 November 1982 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 L | 935 L | GTP | Al Holbert (USA)/Doc Bundy (USA)/Preston Henn (USA) | 4th | 4th | 5th | 83 laps |
6 February 1983 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 L | 935 L | GTP | Bob Wollek (F)/Claude Ballot-Léna (F)/Preston Henn (USA)/A. J. Foyt (USA) | Henn's Swap Shop Racing (USA) | 1st | 1st | 1st | 618 laps |
27 February 1983 - Miami GP - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935 L | 935 L | GTP | Bob Wollek (F) | Henn's Swap Shop Racing (USA) | 9th | 9th | 5th | 27 laps |
19 March 1983 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935 L | 935 L | GTP | Derek Bell (GB)/Michael Andretti (USA)/John Paul, Jr. (USA) | Henn's Swap Shop Racing (USA) | 56th | 9th | 1st | 125 laps - Engine |
24 April 1983 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935 L | 935 L | GTP | A. J. Foyt (USA)/Mario Andretti (USA)/Bill Whittington (USA) | PPG Industries (USA) | 37th | 11th | 10th | 81 laps - DNF |
3 July 1983 - Daytona 250 Miles Paul Revere - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 L | 935 L | GTP | Hurley Haywood (USA)/A. J. Foyt (USA) | Henn's Swap Shop Racing (USA) | 1st | 1st | 1st | 65 laps |
21 August 1983 - Road America 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 935 L | 935 L | GTP | John Paul, Jr. (USA)/Preston Henn (USA) | Henn's Swap Shop Racing (USA) | 33rd | 8th | 3rd | 63 laps - DNF |
27 November 1983 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 L | 935 L | GTP | A. J. Foyt (USA)/Bill Adam (CDN) | Henn's Swap Shop Racing (USA) | 29th | 12th | 4th | 75 laps |
5 February 1984 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 L | 935 L | GTP | A. J. Foyt (USA)/Bob Wollek (F)/Derek Bell (GB) | Henn's Swap Shop Racing (USA) | 2nd | 2nd | 4th | 631 lps |
26 February 1984 - Miami 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 L | 935 L | GTP | A. J. Foyt (USA)/Bob Wollek (F) | Henn's Swap Shop Racing (USA) | 4th | 4th | 10th | 115 laps |
24 March 1984 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 L | 935 L | GTP | Derek Bell (GB)/A. J. Foyt (USA)/Bob Wollek (F) | Henn's Swap Shop Racing (USA) | 3rd | 3rd | 5th | 258 laps |
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 |
3 February 1985 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 16 | Porsche 935 L | 935 L | GTP | Harald Grohs (D) | Henn's Swap Shop Racing (USA) | 74th | 28th | 22nd | 15 laps - Engine |
23 March 1985 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 935 L | 935 L | GTP | Bob Wollek (F)/Don Whittington (USA)/Preston Henn (USA) | Henn's Swap Shop Racing (USA) | 35th | 12th | 14th | 121 laps - DNF |