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Originally Posted by G-string
what do you mean finer finish ?
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He means the surface of the head and block need to be as smooth as possible otherwise you woun't get the best seal. With oem type gaskets it does not have to be as smooth because it can mold better to sufaces that aren't purfectly smooth. I just had head gasket work done to my Supra, had to get a new head, and two Knock sensors too.
