A Cleveland 4V has large ports and coolant crossings right alongside them, so an intake gasket has to seal air and water on the same face. The silicone beads sit proud of the composition base and take the clamp load first, which is what stops coolant creeping into a port.

Mr. Gasket 5836 Ultra-Seal Intake Manifold Gaskets Features:

• Fits 1970-1974 Ford 351C 4V engines.
• Manufactured from cellulose and nitrile composition gasket material.
• Incorporates silicone beading around each intake and water outlet port.
• Beading provides additional sealing strength on both sides of each gasket.
• Provides excellent sealing and durability.