Wow. Thanks for all the time you spent on writing that. I looked at those websites and they were very interesting. I still can't figure out how much to mill off. These formulas aren't making sense since they are not incorporating the octane or anything to do with fuel for that matter. What do they mean by new displacement? I'm not changing the displacement. Maybe someone on here has figured this out before? All I need to know is how much to mill off. Using 3 3/4 pistons, stock 4 inch stroke, and 91 octane fuel. How do I know if it has been plained before? When it comes to porting is there quite a bit of material to work with in the head or does it get thin in spots? Thanks for everyones input.
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