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I need to choose some headgaskets for the High compression 3.1 build. This is an aluminum head engine with iron head pistons in it, about 12 to one depending onthe gaskets used. Might as well go with the thinnest gaskets that are easily avaliable and what others have had success with. Any experience and part numbers or engines that they are intended origionally for and any modifications I need to make to them would be appreciated. Money is an object, but I don't want to cheap out either. Larry