Pontiac 400 455 Remflex Exhaust Manifold Gasket Set 1968 - 1974 # REM12-002Pontiac 400 455 Remflex Exhaust Manifold Gasket Set 1968 1974 # REM12 002 Exhaust Header and Manifold Gaskets, Round Port, Graphite, Pontiac, 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 F, far exceeding any vehicle's exhaust system temperature. They will rebound 30 percent when tightened, creating an optimum seal that eliminates the