PORSCHE RACING HISTORYPorsche 911 S - Chassis No. 230 1687
4 February 1973 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 77 | Porsche 911 S | 230 1687 | GT+2.0 | George Stone (USA)/Bruce Jennings (USA)/Mike Downs (USA) | Silverstone Racing (USA) | 4th | 3rd | 32nd | 638 laps |