Cylinder head, 22cc, 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. This is a stock 6.5hp head which has been milled .065" bringing compression to 10.0:1. This is a great cylinder head for classes that require the stock 22cc head.