PORSCHE RACING HISTORYAl Holbert (USA)
1981 : Sebring 12 Hours - 1st overall : Mid-Ohio 500 km - 2nd in class
1 February 1981 - Daytona 24 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 11 | Porsche 924 Carrera GTR | WP0ZZZ93ZBS720003 | GTO | Al Holbert (USA)/Rick Mears (USA)/Doc Bundy (USA) | Holbert Racing (USA) | 40th | 15th | 26th | 263 laps - Engine |
21 March 1981 - Sebring 12 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 86 | Porsche 935 K3/80 | 000 00024 | GTX | Hurley Haywood (USA)/Al Holbert (USA)/Bruce Leven (USA) | Bayside Disposal Racing (USA) | 1st | 1st | 3rd | 245 laps |
24 May 1981 - Lime Rock 200 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 30 | Porsche 935/81 | JR-001 | GTX | Gianpiero Moretti (I)/Al Holbert (USA) | Momo/Penthouse (I) | 4th | 4th | 7th | 125 laps |
30 August 1981 - Mid-Ohio 500 km - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 924 Carrera GTR | WP0ZZZ93ZBS720003 | Gr.4 | Doc Bundy (USA)/Al Holbert (USA) | Holbert Racing (USA) | 6th | 2nd | 14th | 121 laps |