Easy way to check piston to valve clearance

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#6 (permalink)

01-16-2008, 08:25 AM

Jerry Clayton Jerry Clayton is offline

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Join Date: Jul 2005

Location: Bartlett, Ill

Cobra Make, Engine: Everett-Morrison LS1

Posts: 2,448

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The reason is-----the point of closest contact is not at tdc or max valve opening---it is a few degrees before tdc as the exhaust valve opens and a few degrees after tdc as the intake opens---the piston is chasing the exhaust valve as it closes and the intake valve is chasing the piston as the piston starts down

A little rocker ratio change really doesn't amount to much at those points so unless you are really near the limits you will probably be ok, but I would check anyway

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