Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block with Rectangle Port Heads

Ultra-Seal intake manifold gaskets are manufactured from cellulose/nitrile composition gasket material. Provides excellent sealing and durability. Incorporates Silicone beading around each intake and water outlet port to provide additional sealing strength on both sides of each gasket. No gasket sealer is required. For OE replacement, high-performance street, drag race, and oval track use. Includes manifold end seals and distributor gasket.