GY6 QMJ157 61mm Performance Big Valve Cylinder Head
Regular price $146.00
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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 most QMJ157. Please refer to video in this listing for fitment because there are SOME engines this will not work on and we explain why!
- Exhaust Valve Diameter: 23mm
- Intake Valve Diameter: 28mm
- Exhaust Port Diameter: 27mm
- Intake Port Diameter: 28mm
- 8mm exhaust studs and nuts (included)
- 6mm intake studs (included)
THIS HEAD HAS A 54MM STUD SPACING (GY6 A)