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Cometic Mercury / Chevy Big Block 4.5in Bore .040 inch MLS Headgasket - cgC5638-040 import_2022_03_21_012537 -cc Drivetrain::Valve Bodies 2006-2007 ChevroletCometic Head Gaskets are developed with the performance enthusiast in mind. With so many individual requirements for each motor Cometic offers a number of options to suit your specific motor and needs. *MLS* The Cometic MLS gasket is comprised of three layers of Stainless Steel. Cometic uses Stainless steel for increased strength, its ability to rebound and corrosion resistance. The outer layers of the gasket are embossed and coated on both sides with