Cylinder Head Specifications

CYLINDER HEAD

Valve Seat
Angle 44.25 - 44.75 °
Runout (Max) 0.0762 mm (0.003 in.)
Valve Seat Width (Finish)
Intake 1.016 - 1.542 mm (0.040 - 0.060 in.)
Exhaust 1.524 - 2.032 mm (0.060 - 0.080 in.)

VALVES

Valve Face Angle 43.25 - 43.75 °
Valve Head Diameter
Intake 48.666 mm (1.916 in.)
Exhaust 41.250 mm (1.624 in.)
Valve Length (Overall)
Intake 124.28 - 125.92 mm (4.893 - 4.918 in.)
Exhaust 124.64 - 125.27 mm (4.907 - 4.932 in.)
Valve Lift (@ Zero Lash) 10.973 mm (0.432 in.)
Valve Stem Diameter 7.899 - 7.925 mm (0.311. 0.312 in.)
Valve Guide Bore Diameter 7.950 - 7.976 mm (0.313 - 0.314 in.)
Valve Stem to Guide Clearance
Standard 0.0254 - 0.0762 mm (0.001 - 0.003 in.)
Service Limit (Rocking Method) 0.4318 mm (0.017 in.)

VALVE SPRINGS

Free Length 49.962 mm (1.967 in.)
Spring Tension
Valve Closed 378 N @ 41.66 mm (85 lbs. @ 1.64 in.)
Valve Open 890 N @ 30.89 mm (200 lbs. @ 1.212 in.)
Number of Coils 6.5
Installed Height 41.66 mm (1.64 in.)
Wire Diameter 4.50 mm (0.177 in.)