150cc GY6B Cylinder Head - Non-Emission

57mm Non-Emissions Cylinder Head for 150cc GY6B 4-stroke ZNEN engines commonly found in Lance Phoenix, Flyscooters Cadenza, ZNEN ZN150T-18, Xingyue ITA-150, Motorino Cassini, CMS Prodigy, BMS Pathfinder and many more.

• Overall Height: 73mm
• Bore Diameter: 57mm
• Intake Port Diameter: 22.5mm
• Exhaust Port Diameter: 24mm 
• Pre-Installed Valve Guides
• Non-Emission Style