High-temperature Ultra-Seal header gaskets designed to fit 1970–1979 Ford 351C, 351M, and 400 engines equipped with 2-barrel cylinder heads. These gaskets feature rectangular ports measuring 1.58 in. x 1.96 in. and are built for dependable sealing in performance or OE-replacement applications. The steel-core/graphite construction provides excellent heat resistance, durability, and long-term torque retention. The expanded steel core prevents flange distortion and gasket failure, while the graphite facing conforms to minor imperfections and transfers heat away from the head. The material’s high recovery characteristics allow the gasket to maintain a seal even if clamp load changes. Can be trimmed for port-matched or modified applications. Suitable for street performance, drag racing, and oval-track use.