Well playing with it again.Pat/Richard if I go to the RHS TQ 64cc head and go .010 down it works out to be cr of 9.47.
I plugged in the correct numbers in the formula below.It won't copy and paste that way.
Engine Compression Ratio (CR) Calculator
That would get us back to where we wanted with the added bonus of the head intake runner we wanted too.
Damm,don't know where I came up with the pistons being 12's.:confused:
Richard the heads are not purchased yet.We are spec'ing this build out.So to change out to a 64cc head .010 down is no problem at all.