NCY Big Valve High-Flow Cylinder Head – 61mm GY6 (171cc)

Description

Maximize your motor’s torque and top-end breathing capacity with the premium NCY Big Valve High-Flow Cylinder Head. Engineered specifically to complement large-displacement performance upgrades, this 61mm cylinder head features optimized porting and oversized valves that allow your engine to move air in and out of the combustion chamber far more efficiently. The result is an immediate boost in throttle response, cleaner acceleration, and smoother operation across your entire power band.

Please note: This item is sold without any additional parts.It is the cylinder head body by itself.

Advanced Performance Features

• Oversized Valve Setup: Equipped with large 27.8mm intake and 22.9mm exhaust valves to drastically decrease intake restriction and optimize cylinder head breathing.
• High-Flow Porting Matrix: Cast and precision-finished in Taiwan with smooth internal runners that eliminate factory restrictions and fuel puddling.
• Thermal Management Layout: Constructed from a premium-grade aluminum alloy with wide cooling fins to quickly shed heat under extreme, high-bore engine loads.

Vehicle & Engine Fitment

This high-performance big valve head is tailored as a premium bolt-on upgrade for standard (B-Case) air-cooled GY6 4-stroke platforms. Built strictly for 61mm / 171cc cylinder kits (SKU 1100-1288).

OEM replacement valves are Sku: 1100-1257 NCY High-RPM Racing Valve Set – 28/23mm for GY6