CHEV 496 8.1L ROCKER COVER GASKETS # VS50356 Valve Cover Gaskets, Molded rubber, Chevy, GMC, Each Gasket Material: Molded rubber compound Thickness (in.): 0.270 in. Quantity: Sold individually. Mahle Original Valve Cover Gaskets Regardless of what application you're trying to seal, you can count on Mahle doing the research and testing to provide the optimum material and technology for that specific task. No other gasket distributor offers their application-engineered approach to sealing an engine. Most Mahle Original valve cover gaskets come as complete sets, which contain the valve cover gasket(s), spark plug tube seals when required, and any grommets needed to remove and replace the valve cover. One set does both valve covers on V6 and V8 engines. On some popular engines, valve cover gaskets are sold individually. When sold individually, tube seals and grommets are not included. Over 700 models are available for vehicles from the 1940s and up.