deteriorate blowout or burnout ideal for race street tow vehicles and motor ... block round port big block round port ford small block rectangle port ford small ... coating · better sealing · more forgiving of surface · better removability multi- ... supercharged and nitrous oxide engines made from viton coated spring steel two ... leak-proof seal from cylinder head to engine block withstands shearing forces ... application chevrolet 283-350 57-96 gasket bore 4.060 .040 thickness 283- ... 350 57-96 gasket bore 4.125 .040 thickness 283- ... 350 57-96 gasket bore 4.165 .040 thickness 283- ... 350 57-96 gasket bore 4.200 .040 thickness 350 ... -99 gasket bore 4.540 .040 thickness ford 289-351w 65-95 gasket bore 4.030 .040 ... retains sufficient clamp load ideal for street race tow vehicles motor homes ...