Buick 400 430 455 Remflex Exhaust Manifold Gaskets Square Port # REM13-001Buick 400 430 455 Remflex Exhaust Manifold Gaskets Square Port # REM13 001 Header Gaskets, Rectangular Port, Graphite, Buick, V8, Pair Port Style: Rectangular Gasket Material: Graphite Port Height (in.): 1. 938 in. Port Width (in.): 1. 313 in. Thickness (in.): 0. 125 in. Quantity: Sold as a pair. Remflex Exhaust Header Gasket Sets Remflex exhaust header gasket sets feature 100 percent flexible graphite construction that's effective up to 3,000 degrees