My question is: why? As multiple people have pointed out, you are rolling the dice on a $15k engine and the odds are stacked
heavily against you. Are you not satisfied with the tried and true "safe" power of a 650 kit? The limits of the S65 internals are fairly well known at this stage of the game so why reinvent the wheel at your own expense?
If you are prepared to drop in a new engine and you're just doing this for fun to see what's possible before it blows, then have at it. But if this is your DD I just don't understand why you would push the limits so hard.
Either way,
