it all depends on valve spacing. and what diameter seats are in the heads now. doing it your self is a BAD idea. having it done by a pro shop is the smartest idea. And i hope you realize unless you fully rework the intake ports for the new valve size you will gain nothing in flow. and it will put you closer to PTV. get a real set of heads. dont bother trying to make Decent heads great. it will never happen.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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01-24-2011, 10:24 PM
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