1.all the OEM for Alfa 2.materials:intake valve:SUH1&SUH3,exhaust valve:SUH3& ... parts, intake valve and exhaust valve is the main parts for Toyota,Niaasn, Mitsubishi, Honda, Suzuki, Daihatsu, Isuzu, Mazda, Buick, Peugeot ... we are dealing in.2.The specification for ALFA engine parts as following:3.The materials for valve as your reference4.High quality ...