Mr. Gasket Copper Seal collector gaskets are made from inDead Soft in solid Copper .043 in thick. This gasket incorporates .051 in embossment around each port to seal irregular surfaces, total gasket thickness is .094 in. Provides excellent sealing and durability. Conforms to and seals minor surface irregularities. designed for high-performance street, drag race, oval track and turbo-charged (extreme heat) applications.
Mr. Gasket CopperSeal collector gaskets part no. 7176C have an inside diameter 2.5".