Cylinder Head Rebuilding Specifications

CYLINDER HEAD

Flatness of Gasket Surface 0.05 mm (0.002 in.)
Grinding Limit of Gasket Surface 0.2 mm (0.008 in.)

Manifold-Flatness:
Intake 0.10 mm (0.004 in.)
Service Limit 0.2 mm (0.0008 in.)
Exhaust 0.15 mm (0.006 in.)
Service Limit 0.3 mm (0.001 in.)

Valves Thickness of Valve Head (Margin)
Intake 1.2 mm (0.047 in.)
Service Limit 0.7 mm (0.027 in.)
Exhaust 2.0 mm (0.079 in.)
Service Limit 1.5 mm (0.059 in.)

Valve Stem to Guide Clearance:
Intake 0.03 to 0.06 mm (0.001 to 0.002 in.)
Service Limit 0.10 mm (0.004 in.)
Exhaust 0.05 to 0.09 mm (0.0019 to 0.003 in.)
Service Limit 0.15 mm (0.006 in.)

Valve Face Angle 45° to 45° 30'

Valve Overall Length:
Intake 103.0 mm (4.055 in.)
Exhaust 102.7 mm (4.043 in.)

Valve Stem Diameter:
Intake 7.960 to 7.975 mm (0.313 to 0.314 in.)
Exhaust 7.930 to 7.950 mm (0.312 to 0.3125 in.)

Valve Guide Overall Length:
Intake 44 mm (1.732 in.)
Exhaust 48 mm (1.889 in.)

Valve Guide
O.D 13.055 to 13.06 mm (0.514 to 0.5143 in.)
I.D 8.000 to 8.018 mm (0.314 to 0.315 in.)

Valve Seat:
Seat Surface Angle 44° to 44°.3'
Contact Width 0.9 to 1.3 mm (0.035 to 0.051 in.)
Sinkage Service Limit 0.2 mm (0.078 in.)