JUN Machine Shop has been producing original processing and the engine parts based on our experience of internal combustion engine and various race activities. We substantiated theoretically based on the data obtained from practice. Furthermore, high engine processing of quality is realized by employing original know-how efficiently. The processing set menu was prepared for the head of each engine, and each block in order to offer the highly precise engine processing technology of JUN machine shop. They are processings for demonstrating the durability at the time of an engine upgrade, and the performance of a part is pulled out to the maximum extent. Furthermore, the set menu which combined processing and the JUN high performance part is also prepared.