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01-02-2004 07:57 AM #2
it does increase lift & CAN in crease HP... its trial & error, some people use 1.6 on intake & exhause, some do it just on exhaust...or intake...depends what works.
As I recall your ZZ4 uses self aligning rockers, so keep that in mind if buying rockers.John75 GMC C-15 factory 454, automatic, lowered





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It would be nice if this up and down crap would cease.
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