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Old 04-15-2013, 09:05 PM
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the best online CR calculator is techinspector1
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Old 04-17-2013, 11:28 PM
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Ok, I'll throw another idea or wrench into the equation.

I think i'd like to keep the rotating assembly I have (12cc round dished pistons) and just decide on a head selection that will fit best with what I have. I will zero deck the block and use the felpro 0.041 thick head gasket for my quench. So that leaves me with using the 72cc sportsman ii iron heads for a CR of 9.4 or I could perhaps use a set of aftermarket aluminum vortec style heads 64cc that will give me 10.24 CR. What is the best choice? More CR and the aluminum heads or lower CR and iron heads? Thanks.
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Old 04-17-2013, 11:45 PM
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the camshaft needs to match the "head flow" and cr. You need to determine the HP required.Then decide the engine size you want. The math involved matching head flow to make the HP and the rpm needed for your engine to use all the flow,,,it all counts,not just alloy/cast iron and dcr.
your fuel air flow management needs to match and the exhaust needs to breathe the correct amount

to para phrase tech,its the total combination,,,
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