I think I found the answer. According to federal mogul a TO20 piston compression height is 1.980 and a TO30 is 1.875 which is .105 difference....that"s quite a bit. The reason I was asking is my TO20 runs great but it doesn"t have the pulling power that the TO30 I grew up with had. I"ve got a set of 3 5/16 sleeves...so all I need is a TO30 crank and I guess the pistons would have to be custom made with a 3 5/16 diameter and the 1.875 compression height....which would get me close to the power of a TO35 but still use theTO20 block. I know the valve sizes and combustion chamber is different between the two engines but that is a pretty easy fix. Does this sound like a plan?
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