Two piece Small Block Chevy rear mains are famous for marking the driveway, and the original rope seal is usually the reason. Silicone stays flexible at oil temperatures that harden rope, and because it is injection molded it goes in as a defined shape rather than something you pack and hope.

Mr. Gasket 1960 Silicone Rear Main Seal Features:

• Fits 1959-1985 Chevrolet Small Block Chevy engines with a two piece rear main seal.
• Repairs a leaking rear main seal.
• Silicone rubber withstands extreme engine oil temperatures.
• Upgrade for rope seal equipped engines, or a direct replacement for a rubber main seal.
• Injection molded for a precise fit.