50cc QMB139 4-stroke 47mm, Non Emissions Cylinder Head with 64mm Valves for use with 72cc Big Bore Kit!Please see our Warranty & Returns Policy. For Use with 72cc Big Bore KitValve Length: 64mmOverall Height: 59.5mmIntake Port Diameter: 17mmExhaust Port Diameter: 18mmIntake Bolt Hole Spacing: 44.5mmExhaust Bolt Hole Spacing: 50mm
