Cylinder Head Overall Specifications

Valve Lifter Hydraulic Roller
Valve Rocker arm Ratio 1.70:1
Valve Lash Net Lash-No Adjustment
Valve Face Angle 45 degrees
Valve Seat Angle 46 degrees
Valve Seat Runout 0.05 mm (Maximum) (0.002 inch (Maximum))
Valve Seat Width (Intake) 1.02 mm (0.04 inch)
Valve Seat Width (Exhaust) 1.78 mm (0.07 inch)
Valve Stem Clearance
(Production-Intake) 0.025 - 0.066 mm (0.001 - 0.0026 inch)
Valve Stem Clearance
(Production-Exhaust) 0.025 - 0.066 mm (0.001 - 0.0026 inch)
Valve Stem Clearance (Service-
Intake) 0.093 mm (Maximum) (0.0037 inch (Maximum))
Valve Stem Clearance (Service-
Exhaust) 0.093 mm (Maximum) (0.0037 inch (Maximum))
Valve Stem Diameter
(Production) 7.955 - 7.976 mm (0.313 - 0.314 inch)
Valve Stem Diameter
(Service) 7.9 mm (Minimum) (0.311 inch (Minimum))
Valve Spring Free Length 52.9 mm (2.08 inch)
Valve Spring Pressure
(Closed) 340 N at 45.75 mm (76 lbs. at 1.80 inch)
Valve Spring Pressure
(Open) 980 N at 35.55 mm (220 lbs. at 1.32 inch)
Valve Spring Installed Height
(Intake) 45.75 mm (1.8 inch)
Valve Spring Installed Height
(Exhaust) 45.75 mm (1.8 inch)
Valve Lift
(Intake) 11.99 mm (0.472 inch)
Valve Lift
(Exhaust) 12.15 mm (0.479 inch)
Valve Guide Installed Height (Measured from the Cylinder Head Spring Seat Surface to the Top of the Valve Guide) 17.32 mm (0.682 inch)
Valve Stem Oil Seal Installed Height (Measured from the Valve Spring Shim to Top Edge of Seal Body) 18.1 - 19.1 mm (0.712 - 0.752 inch)