Remove the valves.

Measure the valve in these areas.

Intake Valve Dimensions
A Standard (New):	27.85−28.15 mm (1.096−1.108 in.)
B Standard (New):	118.55−119.15 mm (4.667−4.691 in.)
C Standard (New):	5.48−5.49 mm (0.2157−0.2161 in.)
C Service Limit:	5.45 mm (0.215 in.)
Exhaust Valve Dimensions
A Standard (New):	22.85−23.15 mm (0.900−0.911 in.)
B Standard (New):	117.25−117.85 mm (4.616−4.640 in.)
C Standard (New):	5.45−5.46 mm (0.2146−0.2150 in.)
C Service Limit:	5.42 mm (0.213 in.)