Remove the valves.

Measure the valve in these areas.

Intake Valve Dimensions
A Standard (New):	34.85−35.15 mm (1.372−1.384 in.)
B Standard (New):	108.5−109.1 mm (4.272−4.295 in.)
C Standard (New):	5.475−5.485 mm (0.2156−0.2159 in.)
C Service Limit:	5.445 mm (0.214 in.)
Exhaust Valve Dimensions
A Standard (New):	29.90−30.10 mm (1.177−1.185 in.)
B Standard (New):	108.4−109.0 mm (4.268−4.291 in.)
C Standard (New):	5.450−5.460 mm (0.2146−0.2150 in.)
C Service Limit:	5.42 mm (0.213 in.)