Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
First, remove the valve covers.
Turn the valve rocker arm nut clockwise until the valve lash is felt in the valve pushrod.
Turn the valve rocker arm counterclockwise until all the valve lash is removed (zero valve lash).
Zero valve lash can be felt by moving the valve pushrod up and down between your thumb and forefinger until there is no more up and down movement of the valve push rod.
When all the valve lash is removed, then turn the rocker arm nut clockwise 1 additional turn (360 degrees).
Repeat adjustment same as for the other cylinders.
Reinstall the valve covers using new gaskets.
Valve lash... 0 plus one turn.
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