Chev 454 Remflex 2003 Exhaust Manifold Gasket Set Square Port # REM2003Chev 454 Remflex 2003 Exhaust Manifold Gasket Set Square Port # REM2003 Header Gasket, Graphite, 1. 875 in. x 1. 813 in. Port, 0. 125 in. Thick, Chevy, Big Block, Set Port Style: Square port Gasket Material: Graphite Port Height (in.): 1. 875 in. Port Width (in.): 1. 813 in. Thickness (in.): 0. 125 in. Quantity: Sold as a set. Remflex Exhaust Header Gasket Sets Remflex exhaust header gasket sets feature 100 percent flexible graphite construction