PORSCHE RACING HISTORYChassis No. 911 360 0307 R3
4 February 1973 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 911 Carrera RSR | 911 360 0307 R3 | S3.0 | Mark Donohue (USA)/George Follmer (USA) | Penske Racing (USA) | DNF | 12th | 405 laps - Engine |
21 July 1973 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 911 Carrera RSR | 911 360 0307 R3 | GT | Al Holbert (USA)/John McComb (USA) | Holbert's Porsche-Audi (USA) | DNF | 19th | 140 laps - Suspension |