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JBA premium header gasket for Chevrolet 396–502 big-block round ports. Sold as a pair, these gaskets provide a precise flange seal to support installation of JBA headers and improve exhaust flow and tone when replacing restrictive factory seals. Constructed extra thick from a specially formulated material for an exact port match with JBA headers; rated to handle exhaust pressures up to 3700 psig and temperatures to 1100°F.
JBA Chevrolet 396-502 BBC Round Port Header Gasket - Pair
