Valve Guide Servicing: Inspection
WARNING: This page is about a different car, the 1985 Chevrolet Sprint. However, it is still accessible from the selected car via links, so may be relevant.
Using a micrometer and bore gauge, take diameter readings on valve stems and guides to determine stem clearance in guide. Be sure to take readings at more than 1 position along length of stem and guide. Replace valve or guide as necessary.