Mr. Gasket 152 - Header Gaskets - Performance - 396-454 Chevrolet Big Block Mark IV 1965-90

Port Diameter 1.45" Port Shape .062" Collector Gaskets Included 3 This is a high quality gasket that has proven to be an excellent performer in all applications, works well on stock heads or heads that have minor port matching done. Can be used for high performance street, drag race and oval track use.