the XPZ can technically be run on stock heads, but wont make any power because it wont be able to flow like the cam needs.
but yes, i would run 130# springs with ported heads.
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08-31-2009
the XPZ can technically be run on stock heads, but wont make any power because it wont be able to flow like the cam needs.
but yes, i would run 130# springs with ported heads.
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