Cylinder Head Assembly
Cylinder HeadCombustion Chamber Volume 53.407 cc3.259 cu in.)
Valve Guide Bore - Exhaust 6.000-6.020 mm (0.2362-0.2370 in.)
Valve Guide Bore - Intake 6.000-6.020 mm (0.2362-0.2370 in.)
Valve Guide Installed Height 14.050-14.550 mm (0.5531-0.5728 in.)
Valve Lifter Bore Diameter 12.008-12.030 mm (0.4728-0.4736 in.)
Valve System
Valves
Valve Face Angle 44.25 degrees
Valve Face Runout 0.038 mm (0.0015 in.)
Valve Face Width - Exhaust 2.750 mm (0.1083 in.)
Valve Face Width - Intake 2.180 mm (0.0858 in.)
Valve Head Diameter - Exhaust 30.470-30.730 mm (1.1996-1.2098 in.)
Valve Head Diameter - Intake 36.830-37.090 mm (1.4500-1.4602 in.)
Valve Installed Height 35.23-36.69 mm (1.3870-1.4445 in.)
Valve Length - Exhaust 97.110 mm (3.8232 in.)
Valve Length - Intake 101.230 mm (3.9854 in.)
Valve Seat Angle - Seating Surface 45 degrees
Valve Seat Angle - Relief Surface 30 degrees
Valve Seat Angle - Undercut Surface 60 degrees
Valve Seat Runout - Maximum 0.050 mm (0.0020 in.)
Valve Seat Width - Exhaust Seating Surface 1.400-1.800 mm (0.0551-0.0709 in.)
Valve Seat Width - Exhaust Relief Surface 0.700-0.900 mm (0.0276-0.0354 in.)
Valve Seat Width - Intake Seating Surface 1.000-1.400 mm (0.0394-0.0551 in.)
Valve Seat Width - Intake Relief Surface 0.500-0.700 mm (0.0197-0.0276 in.)
Valve Stem Diameter - Exhaust 5.945-5.965 mm (0.2341-0.2348 in.)
Valve Stem Diameter - Intake 5.955-5.975 mm (0.2344-0.2352 in.)
Valve Stem-to-Guide Clearance - Exhaust 0.035-0.075 mm (0.0014-0.0030 in.)
Valve Stem-to-Guide Clearance - Intake 0.025-0.065 mm (0.0010-0.0026 in.)
Valve Lifters
Valve Lifter Diameter 11.489-12.000 mm (0.4523-0.4724 in.)
Valve Lifter-to-Bore Clearance 0.037-0.041 mm (0.0015-0.0016 in.)
Rocker Arms
Valve Rocker Arm Ratio 1.68 to 1
Valve Rocker Arm Roller Diameter 17.750-17.800 mm (0.6988-0.7008 in.)
Valve Springs
Valve Spring Coil Thickness 3.250 x 3.900 mm (0.1280 x 0.1535 in.)
Valve Spring Diameter - Inside Top 12.090-12.590 mm (0.4760-0.4957 in.)
Valve Spring Diameter - Outside Top 20.140 mm (0.7929 in.)
Valve Spring Diameter - Inside Bottom 17.950-18.450 mm (0.7067-0.7264 in.)
Valve Spring Diameter - Outside Bottom 26.000 mm (1.0236 in.)
Valve Spring Free Length 42.050-44.850 mm (1.6555-1.7657 in.)
Valve Spring Installed Height - Closed 35.000 mm (1.3779 in.)
Valve Spring Installed Height - Open 24.000 mm (0.9449 in.)
Valve Spring Load - Closed 247-273 N (56-61 lb)
Valve Spring Load - Open 598-662 N (134-149 lb)