Valve Guide

Valve Guide Inside Diameter 6.6 mm (0.260 inch)
Valve Guide Outside Diameter 12.1 mm (0.476 inch)
Valve Guide Projection From:
Cylinder Head Upper Surface 19.5 mm (0.77 inch)
Oversize Rework Dimensions Of Valve Guide Hole:
Both Intake and Exhaust:
0.05 Oversize 12.05 - 12.07 mm (0.4744 - 0.4752 inch)
0.25 Oversize 12.25 - 12.27 mm (0.4823 - 0.4831 inch)
0.50 Oversize 12.50 - 12.52 mm (0.4921 - 0.4929 inch)