GY6 4 Valve Performance Cylinder Head

The 4v head is the cream of the crop! Max out the potential of your engine with this bad boy! More air in, more air out = MORE PERFORMANCE :-). We have this head available for the GY6 “A” with the 54mm stud spacing (to be used with a 63mm bore) or the GY6 “B” with the 57mm stud spacing (to be used with a 67mm bore).  Kit Includes: 24mm Intake/ 22mm Exhaust Valve 4 Valve Camshaft 4 Valve Rocker Arm 4 Valve Cover Timing Chain for +8.2 Stroker Crankshaft Head Stud for +8.2 Stroker Crankshaft PLEASE NOTE: This head will require the cases to be split to install the timing chain.