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Stock Head?

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Nov 20, 2008 | 07:00 PM

#1

Hot Wheelz

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From: NJ

Stock Head?

How much Power can be made with a stock head by just upgrading the valve springs? No porting work or valve job.

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Nov 20, 2008 | 07:18 PM

#2

mandy1

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From: puerto rico

on a evo8 i made 628hp 35 psi with stock head supertech duals.

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