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I don't know much...having a hard time deciding. I heard 347's do not last as long. Also any recommendations on a good book or source on how to convert a 302 to a 331 or 347?
I've heard the same thing about 347's wearing out bearings. Also I think that with a 347 you have to notch out the bottom of the cylider wall for rod bolt clearance. I personally would go with the 331.
331 or 347?
