GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

VALVE LASH

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All engines covered in this guide are equipped with hydraulic valve lifters. Engines so equipped operate with zero clearance in the valve train; because of this the rocker arms are non-adjustable. The hydraulic lifters themselves do not require any adjustment as part of the normal tune-up, although they occasionally become noisy (especially on high mileage engines) and need to be replaced. Hydraulic lifter service is covered in Engine & Engine Overhaul .

 
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