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The Manley Extreme Duty exhaust valve is a heavy-duty replacement built for high-force, high-heat applications such as Top Fuel and Funny Car drag racing, Big Block Chevy marine setups, and restricted Small Block Chevy circle track builds. Constructed from XH-432 XtremeAlloy with chrome stems and hard tips, each valve features swirl-polished underhead areas and machined combustion faces for improved flow, combustion efficiency, and extended wear resistance.
Manley Big Block Chevrolet 1.880 Diameter Stock Length Extreme Duty Exhaust Valves - Set of 8
