PORSCHE RACING HISTORYDave Helmick (USA)
1973 : Sebring 12 Hours - 1st overall
4 February 1973 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 43 | Porsche 911 S | 911 230 0921 | GT+2.0 | Dave Helmick (USA)/John O'Steen (USA)/Stephen Behr (USA) | Dave Helmick (USA) | 11th | 8th | 31st | 558 laps |
24 March 1973 - Sebring 12 Hours - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 59 | Porsche 911 Carrera RSR | 911 360 0705 | GTO | Peter Gregg (USA)/Hurley Haywood (USA)/Dave Helmick (USA) | Dr. Dave Helmick (USA) | 1st | 1st | 4th | 226 laps |
21 July 1973 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 43 | Porsche 911 Carrera RSR | 911 360 0915 | GT | Dave Helmick (USA)/John O'Steen (USA) | Ecurie Escargot (USA) | 12th | 4th | 24th | 164 laps |