canadianregal
Building from the grnd up
- Joined
- Jan 20, 2006
- Messages
- 101
![Confused :confused: :confused:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png)
They list the NA 231 at 9.5 to one ratio --both the throttle body and the carb version but the carb has 42.7 cc heads and the throttle body has 36.5 cc heads
The turbo version has 8.6 ratio with 42.7 cc heads
Wheres the different ratios coming from
![Confused :confused: :confused:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png)
![Confused :confused: :confused:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png)
would it be the thicnkness of the head gaskets--i doubt it would change from 8.6 to 9.5 though