Please take into account that the true CR can be less than quoted by the factory. Doing the math based on actual measurements I had to skim the block with 4,6 pistons to get even close to factory figure of 9,35. Pistons were down in the bore about .040" at TDC. After skimming they are now about .015 down the bore, I use 28 cc heads and thin gaskets. CR is around 10.3 with my components.
Like Stevie said, measure what you have and do the math. One thing though, does every block have enough room to clear a 4,6 crank ?
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