Mr. Gasket Ultra-Seal Stock Port Exhaust Gaskets are designed and constructed to improve the sealing of exhaust header flanges. The height of the gasket is 1.48"and its width is 1.78". Ultra-seal exhaust gaskets incorporate a graphite-impregnated facing and a steel expanded metal core. Gaskets offer superior tensile strength to resist cracking under the excessive heat and pressure that is common in the exhaust system.