GY6 61mm Performance big valve cylinder head
If you are doing a 171cc big bore kit and want to kick it up a bit more here ya go. This big valve head with larger porting will allow more air in and more air out, resulting in more power!! This will fit all qmj157 and qmj152 engines.
- Exhaust Valve Diameter: 23mm
- Intake Valve Diameter: 27.75mm
- Exhaust Port Diameter: 26.5mm
- Intake Port Diameter: 27.5mm
THIS HEAD HAS A 54MM STUD SPACING (GY6 A)