TOMEI OVER SIZE VALVE SET For EVO 10 4B11 163405Brand TOMEI Product Number 163405 Compatible Car EVO 10 Compatible Engine 4B11 Product Description Tuned engines require as much fuel mixture to enter the combustion chamber as possible. So a larger diameter design was selected to optimize flow rates. Due to the extremely high temperature conditions experienced in the combustion chamber during high power runs the durability of the valves were also addressed to improve resistance to high heat