OEM MerCruiser Valve-Pcv 21-8M2017060
PCV valve 8M2017060 is for V-8 MerCruiser engines made by General Motors (305, 350, 377 and 454 cid) plus the 575 SCi. PCV valve is an important part of the crankcase ventilation system. It helps maintain optimal level of vacuum in the engine crankcase to extract the products of blow-by along with potentially damaging, excess moisture. Check your owner's manual or service manual for replacement schedule, specific application and installation instructions.