JUN AUTO Racing Valve Spring For MITSUBISHI 4G92 1009M-M001Brand JUN AUTO Product Number 1009M M001 Compatible Car MITSUBISHI Compatible Models 4G92 Product Description When valve speed increases by high rotation ization of engine, 'valve bounce' may occur by the factory valve springs. Moreover, since inherent pitch is low, 'Surging' may occur in a high rotation region. In JUN, the valve spring with which the load optimal at the time of a set and a valve lift is acquired was manufactured. Even when the amount