PORSCHE RACING HISTORYAl Holbert (USA)
1980 : Daytona 24 Hours - 2nd overall
3 February 1980 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935/77A | 930 890 0021 | GTX | John Paul Sr. (USA)/Al Holbert (USA) | Thunderbird Swap Shop (USA) | 2nd | 2nd | 13th | 682 laps |
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 |
27 April 1980 - Riverside 5 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 935/79 | 930 990 0030 | GTX | Peter Gregg (USA)/Al Holbert (USA) | Brumos Porsche Audi (USA) | 54th | 17th | 3rd | 27 laps - Oil Pressure |
15 June 1980 - Le Mans 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 924 Carrera GT | WP0ZZZ93ZBS720003 | GTP | Derek Bell (GB)/Al Holbert (USA) | Porsche System (D) | 13th | 6th | 34th | 306 laps |