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Message: <blockquote data-quote="96blak54" data-source="post: 1569837" data-attributes="member: 14727"><p>Lifters begin to pump up within that rpm range. Remember,lifter and valve spring are a harmonized dance of dominance with cam lobe ramp rates as rpm increase, so does psi to the lashers, causing them to "bleed slower". Oil weights affect lashers bleed rate and the wrong oil weight will cause them to hydraulic. This oil psi at high rpm is no more than 20psi. If you believe its mechanical like valve spring pressure, I would suggest solid lashers before springs. Heck, if youre running anything other than synthetic normal 5w-20/30 oil, the lasher bleed and hydraulic action will not be correct. Even 5w-20 "high milage" oil screws with their purpose</p></blockquote><p></p>