YZ450f +23 Head Porting with +1mm Valves and Installation

This is a complete kit which includes head porting on customers head, and +1mm titanium valves and all machine work. When you send in your head we will completely port the intake and exhaust, then cut the valve seats to +1mm size, modify the chamber, and set the head up for maximum power. This is highly recommended to complement the 102mm big bore kits for monster power gains.