About Product About the Brand Moroso GM LT1/LT4/L86 (w/6.2L Heads) Valve Cover - Billet Aluminum - PairMoroso GM LT1/LT4/L86 (w/6.2L Heads) Valve Cover - Billet Aluminum - Pair Whether its for a full rebuild or some standard maintenance, the proper engine components are needed to make sure your vehicle is running smooth. Valve covers are used to seal off an engine's valves and prevent any dirt from getting into the engine. Valve covers are also designed to seal the engnine and prevent oil from leaking out of the top end. About Moroso Moroso Performance Products is one of the worlds most respected suppliers of automotive equipment for racing and street performance applications. Moroso manufactures over 4000 products, from oil pans and oiling systems, to ignition wire, ignition components, valve covers, fuel system equipment, air cleaners, hard-core racing tools, chassis and suspension equipment and numerous other performance parts. The company has an impressive list of customers, ranging from grass-roots racers to top level NASCAR® and NHRA/IHRA race teams.