PORSCHE RACING HISTORYHarry Bytzek (CDN)
1977 : Mosport 6 Hours - 3rd in class
6 February 1977 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 911 Carrera RSR | GTO | Klaus Bytzek (CDN)/Harry Bytzek (CDN)/Rudy Bartling (CDN) | Bytzek Automotive Design (CDN) | 27th | 16th | 26th | 343 laps - DNF |
20 August 1977 - Mosport 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 911 Carrera RSR | TA-II | Klaus Bytzek (CDN)/Rudy Bartling (CDN)/Harry Bytzek (CDN) | Bytzek Automotive Design (CDN) | 5th | 3rd | 13th | 224 laps |