Valve Guides
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Valve guides are part of cylinder head (not replaceable). If valve stem-to-guide oil clearance is not within specification, ream valve guides using Reamer Set (J-7049) and install oversize valves. See CYLINDER HEAD table under ENGINE SPECIFICATIONS. Valves are available in .003" (.08 mm) and .015" (.38 mm) oversize.