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The JBA premium header gasket pair for Small Block Chevrolet 265–400 engines is a thick, application-specific gasket designed for D-port header installations. Manufactured from a specially formulated material, it provides an exact port match and seals exhaust pressures up to 3700 psig while tolerating temperatures to 1100°F. The gasket supports reliable flange sealing for performance exhaust systems and replacement header installs.
JBA Chevrolet 265-400 SBC D-Port Header Gasket - Pair
