The 4 valve head will out perform any 2 valve head. It comes with a sport cam good through all rpm ranges. However on some of the heads you will need a piston with 4 valve reliefs and it comes with a longer timing chain for which you will have to split the case to install. It is possible to replace the chain using a chain breaker than threading the new chain through but is tedious and should be left to someone who has done it before. Hoca used to make a great head however as of late not such a great head for the money.
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