Valve Guide: Specifications

OVERSIZE VALVE GUIDE HOLE:
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)

STEM TO GUIDE CLEARANCE:
Intake 0.02 - 0.09 mm (0.0008 - 0.0020 inch)
Exhaust 0.05 - 0.09 mm (0.0020 - 0.0035 inch)

DIMENSIONS:
Inner Diameter 6.6 mm (0.260 inch)
Outer Diameter 12.1 mm (0.476 inch)
Projection From Head Upper Surface 19.5 mm (0.77 inch)