Cylinder head, 14cc, ported and milled. 3 angle on valve seats. With its increased compression and improved flow, this cylinder head is an excellent choice for the racer looking to take his/her GX160/GX200 to the next level. Milling these heads .065" works best for most applications bringing compression to a little over 12:1. Increased flow and velocity from our porting makes this head an excellent choice for performance and value.