I have an 85 Honda CRX with a 1.5 that I race. A fellow racer has an 85 Prelude with a 1.8. The engines look very simular, except for the fact he has dual carbs. My question is, do the two engines share the same block? Can I turn my 1.5 into a 1.8, and still pass it off as a 1.5? Is it just a matter of different crankshafts? Anyone know?