... engine parts 1.We are the professional manufacturer(factory) that produce all kinds of engine valves,we have motorcycle valves, diesel engine valves ,auto engine ... 40Cr) ; EXHAUST VALVE IS SUH3(4Cr9Si2). 3. our engine valves are suitable for TOYOTA,AUDI,BESFORD,BMW,CATERILLAR,CUMMINS ... , surfacing nitration treatment.Of course , we can produce engine valves according to your samples . 5.if you are ...