PROPRIETARY COATING -- Nonstick anti-friction coating seals small surface scratches and imperfections SEALING TECHNOLOGIES -- Exclusive sealing innovations and technologies with proprietary materials and unique design features to ensure a superior seal for your repair NO RETORQUE DESIGN -- Steel core helps eliminate the need for retorquing head bolts STRONG AND DURABLE -- Features graphite or reinforced fiber facing material and steel armor for strength and durability DESIGNED FOR IMPERFECT SEALING SURFACES -- Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces Designed for Chevy 366/427/454 engines Head gasket Stainless steel Composition type; Marine Sold individually Fel-Pro® gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust