Taida GY6 Big Port Cylinder Head Millimeters:57mm Note: This unit is for

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Taida GY6 Big Port Cylinder Head Millimeters:57mm Note: This unit is forThe Taida GY6 Big Port Head is a great match for the 180cc Displacement GY6. The larger ports will allow more air to flow into the cylinder to match the displacement of 150cc and up GY6 engines. We now offer this Big Port Head for both the 54mm standard and the 57mm "B" upgrade head stud case. Want more flow? Opt in for the port and polish! Application: GY6 125cc and 150cc engine 54 or 57mm Head Stud Spacing 28 23mm Intake and Exhaust Port 63mm 67mm