K 3500 Truck 4WD V8-5.7L VIN R (1998)
Valve Guide Seal: Specifications
Valve Stem Oil Seal Installed Height * ....................................................................................................................... 1 - 2 mm (0.03937 - 0.07874 inch)
*
Measured From The Top Of The Large Diameter Valve Guide Bevel To The Bottom Of The Valve Stem Oil Seal