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Fel-Pro’s performance head gaskets were a perfect match for our 383 build. Our set (PN 1003) featured a 4.166-inch bore and 0.041-inch thickness. They also feature a PermaTorque/blue head gasket body with a solid-steel core to minimize torque loss and blowout. A wire ring combustion chamber seat with stainless steel provides extra sealing force around each combustion chamber.