Valve Guide

Valve Guide Internal Diameter 6.6 mm (0.260 inch)
Valve Guide Projection 17.0 mm (0.670 inch)
Oversize Valve Guide Hole Diameter:
0.05 Oversize 12.050 - 12.068 mm (0.4744 - 0.4752 inch)
0.25 Oversize 12.250 - 12.268 mm (0.4823 - 0.4831 inch)
0.50 Oversize 12.500 - 12.518 mm (0.4921 - 0.4929 inch)