Valve Stem to Guide Clearance

Check the valve stem-to-valve guide clearance of each valve in its respective valve guide with Dial Indicator with Bracketry 100-002 (TOOL-4201-C) and Valve Stem Clearance Tool 303-004 (TOOL-6505-E) or equivalent. Use a flat-end indicator point.
Install the tool on the valve stem until it is fully seated, and tighten the knurled setscrew firmly. Permit the valve to drop away from its seat until the tool contacts the upper surface of the valve guide.
Position Dial Indicator with Bracketry 100-002 (TOOL-4201-C) or equivalent with its flat tip against the center portion of the tool's spherical section at approximately 90 degrees to the valve stem center axis. Move the tool back and forth in line with the indicator stem. Take a reading on the dial indicator without removing the tool from the valve guide upper surface. Divide the reading by two, the division factor for the tool. If valve stem-to-valve guide clearance exceeds the wear limit, install new valve and recheck clearance. If clearance is still beyond specification limit, replace valve guide.
If the valve and/or valve seat has been refaced, it will be necessary to check the clearance between the rocker arm bearing surface or valve tappet surface (depending upon application) and base circle of the camshaft lobe with the valve train installed in the engine.