Cylinder Head
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
If surface warpage exceeds specification, replace cylinder head. See CYLINDER HEAD table under ENGINE SPECIFICATIONS. DO NOT machine cylinder head surface. Measure cylinder head thickness (distance between valve cover gasket surface and cylinder head gasket surface). If thickness is less than specified, replace cylinder head.