Cylinder head for kit DR Racing black Ø40,3mm 50cc engine or origin minarelli am6

Here the cylinder head high compression at DR Racing, this cylinder head is the replacement of the kit 50cc black DR Ø40,3mm Racing, it can also be mounted on a cylinder origin minarelli am6 euro 2 (cast iron) to improve performance original engine by optimizing the compression ratio. The room is a hemispherical pattern, blasted finish.