PORSCHE RACING HISTORYAl Holbert (USA)
1979 : Riverside 6 Hours - 2nd overall : Watkins Glen 6 Hours - 2nd in class
4 February 1979 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 935 JLP-1 | JLP-1 | GTX | John Paul Sr. (USA)/Al Holbert (USA)/Michael Keyser (USA) | JLP Racing (USA) | 65th | 21st | 5th | 12 laps - Electrics |
17 March 1979 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 935 JLP-1 | JLP-1 | GTX | John Paul Sr. (USA)/Al Holbert (USA) | JLP Racing (USA) | 24th | 8th | 3rd | 176 laps - Transmission |
22 April 1979 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 935 JLP-1 | JLP-1 | GTX | John Paul Sr. (USA)/Al Holbert (USA) | JLP Racing (USA) | 2nd | 2nd | 2nd | 195 laps |
7 July 1979 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 935 JLP-1 | JLP-1 | TA-II | John Paul Sr. (USA)/Al Holbert (USA) | J.L.P. Racing, Inc. (USA) | 6th | 2nd | 7th | 167 laps |