Ford 351 Cleveland 4bbl Carbie Remflex Exhaust Manifold Gaskets REM3007 Rate_40 Are you looking for a Are you looking for a set of entry level street performance heads for your modern street rod Water Neck Gasket Included:No Heating and cooling of the exhaust system causes header and manifold flanges to warp resulting in gaps between the head and header which Remflex exhaust gaskets seal completely due to the thickness and compressibility of the 100 percent flexible graphite Remflex exhaust gaskets come in a standard 1 8 inch thickness and are designed to crush 50 percent allowing them to fill any pits or gaps in the flange surface up to 1 16 inch