Wehrli Custom Fab Duramax Billet Upper Valve Cover Set LLY, LBZ, LMM



WCFab Billet Upper Valve Cover set with -10AN breather ports on each side. ***NOTE: These valve covers do not have OEM style bosses to accept factory fuel filter housing bracket or upper coolant pipe and other OEM type items*** These are designed for high horsepower race applications and modifications to wire harness tabs and mounting brackets are necessary.