... 3)Nitrided or chromed and polis CUMMINS ISC Engine valve 1.We are the professional manufacturer(factory) that produce ... high temperature,resist deformation and also called Martensite. Exhaust valve is high exhaustion strength,withstand high temperatures, resist deformation, ... are suitable for TOYOTA,AUDI,BESFORD,BMW,CATERILLAR,CUMMINS,DAF,DAIHATSU,DAEWOO,FORD,FIAT,HILLMAN,HINO,HONDA,HYUNDAI,ISUZU, ...