Check out the various header gasket sets Spectre offers for Chevy Big Block engines. We offer header gasket sets for the stock rectangular port, round 1.70 inch, 1.93 inch ports, and the 1.90 inch by 2.0 inch square ports. Spectre header gaskets are made from compressed ceramic fiber (CCF). CCF far exceeds typical non-asbestos type gaskets and are designed to not deteriorate or crack from excessive heat or pressure. Our extra thick 1/8 inch gaskets provide superior sealing with even, uneven or slightly warped header flanges.