Hoca 50mm QMB139 Performance Head, Part #169-70

Hoca 50cc QMB139 4-stroke 50mm, performance cylinder head. replaces Cylinder Heads with 64mm Valves (Short Valve Style). Intake Valve Diameter: 21.5mm. Intake Port Diameter: 24mm. Exhaust Valve Diameter: 18.9mm. Exhaust Port Diameter: 22mm. Valve Length: 62.3mm (compatible with 64mm Short Valve Style Heads). Does not come with camshaft.