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JBA premium header gasket for Chevrolet 265–400 small-block rectangle ports. This pair provides a precise seal to aid fitment with JBA headers during an exhaust upgrade, helping restore proper flow and exhaust tone by replacing restrictive factory sealing. Made extra thick from a formulated gasket material for an exact port match with JBA headers; handles exhaust pressures up to 3700 psig and temperatures to 1100°F for reliable sealing under high-heat conditions.
JBA Chevrolet 265-400 SBC Rectangle Port Header Gasket - Pair
