Mr. Gasket Exhaust Gaskets are made of high-grade materials to reduce the chance of a blowout under high exhaust temperatures or pressure. They fit best to small race ports with a port dimension of 1.12" and 1.48" width and height. The super performance of these exhaust gaskets helps in the stock rebuild. Gaskets prevent exhaust leakage out of the connection and also ensure that all exhaust gas will flow through the catalytic converter for treatment. These exhaust gaskets are fabricated from large-fiber gasket material bonded by a high-heat resistant compound. Exclusively designed for Ford.