Cylinder Head

CYLINDER HEAD SPECIFICATIONS
Gasket Thickness (Compressed) 0.7 mm (0.0276 in.)
Valve Seat Angle 44.5 - 45.0 °
Valve Seat Runout (MAX) 0.051 mm (0.002 in.)
Valve Seat Width
Intake 1.75 - 2.36 mm (0.0698 - 0.0928 in.)
Exhaust 1.71 - 2.32 mm (0.0673 - 0.0911 in.)
Guide Bore Diameter (Std.) 6.975 - 7.00 mm (0.2747 - 0.2756 in.)
Cylinder Head Warpage (Flatness) 0.0508 mm (0.002 in.)

VALVES
Face Angle 45 - 45.5 °
Head Diameter
Intake 48.52 - 48.78 mm (1.9103 - 1.9205 in.)
Exhaust 36.87 - 37.13 mm (1.4516 - 1.4618 in.)
Length (Overall)
Intake 113.45 - 114.21 mm (4.4666 - 4.4965 in.)
Exhaust 114.92 - 115.68 mm (4.5244 - 4.5543 in.)
Stem Diameter
Intake 6.931 - 6.957 mm (0.2729 - 0.2739 in.)
Exhaust 6.902 - 6.928 mm (0.2717 - 0.2728 in.)
Stem-to-Guide Clearance
Standard
Intake 0.018 - 0.069 mm (0.0008 - 0.0028 in.)
Exhaust 0.047 - 0.098 mm (0.0019 - 0.0039 in.)
Maximum Allowable (Rocking Method)
Intake 0.069 mm (0.0028 in.)
Exhaust 0.098 mm (0.0039 in.)
Valve Lift (Zero Lash)
Intake 11.25 mm (0.443 in.)
Exhaust 10.90 mm (0.4292 in.)

VALVE SPRINGS
Free Length (Approximately)
Intake and Exhaust 48.6 mm (1.9134 in.)
Spring Force (Valve Closed)
Intake and Exhaust 315.5 - 352.5 N @ 40.89 mm
(70.92722 - 79.24515 lbs. @ 1.6099 in.)
Spring Force (Valve Open)
Intake and Exhaust 786.0 - 860.0 N @ 29.64 mm
(176.6998 - 193.3357 lbs. @ 1.167 in.)
Number of Coils
Intake and Exhaust 6.69
Wire Diameter
Intake and Exhaust 4.2799 - 4.3561 mm (0.1685 - 0.1715 in.)
Installed Height (Spring Seat to Bottom of Retainer)
Nominal Intake 40.97 mm (1.613 in.)
Exhaust 40.81 mm (1.606 in.)