Remflex Exhaust Header Gaskets, Graphite, D-port, Pontiac V8, Pair # REM12-001Remflex Exhaust Header Gaskets, Graphite, D port, Pontiac V8, Pair # REM12 001 Exhaust Header Gaskets, Graphite, D port, Pontiac V8, Pair Port Style: D port Gasket Material: Graphite Port Height (in): 1. 813 in. Port Width (in): 1. 375 in. Thickness (in): 0. 125 in. Quantity: Sold as a pair. Remflex exhaust header gasket sets feature 100 percent flexible graphite construction that's effective up to 3,000 degrees F, far exceeding any vehicle's exhaust