Located directly above the cylinder head, a valve cover is a critical component that prevents oil from escaping through the top of an engine. Oil keeps temperatures down and reduces friction between ...

Due to their high resistance to corrosion and low weight, plastic butterfly valves have already proven to be superior to metal valves in many ways. Their lifetime is up to three times longer, and they ...

Modern engine bays are filled with black plastic where bright cast aluminum once sat, and few parts symbolize that shift more clearly than valve covers. Automakers have largely traded metal for molded ...