Cylinder Head: Valves

After valve service, measure valve stem and rotator height as shown. See Fig 1 . There should be .015" (.38 mm) clearance between valve stem and gauge. Clearance between valve rotator and valve stem must be greater than .005" (.13 mm). If not within specifications, replace components as necessary.

Fig 1: Checking Valve Stem & Rotator Height

Courtesy of GENERAL MOTORS CORP.