Valve Guide: Specifications

Valve Guide Hole Diameter
0.05 (0.002) O.S. 12.05 - 12.068 mm (0.474 - 0.475 inch)
0.25 (0.010) O.S. 12.25 - 12.268 mm (0.482 - 0.483 inch)
0.50 (0.020) O.S. 12.50 - 12.518 mm (0.492 - 0.493 inch)

Stem Diameter
Intake 6.565 - 6.580 mm (0.258 - 0.259 inch)
Exhaust 6.530 - 6.550 mm (0.257 - 0.258 inch)
Face angle 45° - 45.5°

Clearance (stem-to - guide)
Intake 0.02 - 0.05 mm (0.0009 - 0.0020 inch) 0.1 mm (0.0039 inch)
Exhaust 0.05 - 0.085 mm (0.0020 - 0.0033 inch) 0.15 mm (0.0059 inch)


Valve guide Length
Intake 45.5 mm (1.7913 inch)
Exhaust 50.5 mm (1.9882 inch)
Service oversize 0.05, 0.25, 0.50