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The Cometic StreetPro top-end gasket kit for GM Gen-5/6 454 Big Block includes the MLS .040" cylinder head gasket for a 4.375" bore and supplies common top-end gaskets and seals needed for a street rebuild. StreetPro kits prioritize quality gasket materials—MLS, AFM, Aramid Fiber and Armor Clad—delivered as a complete, budget-focused package for street-rod engines.
Cometic Street Pro GM Gen-5/6 454 Big Block 4.375in Bore .040in Top End Gasket Kit
