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The Manley Extreme Duty exhaust valve for Chevrolet Big Block engines is engineered for high-heat, specialized competition use where extreme strength and fatigue resistance are required. Suited to Top Fuel and Funny Car drag racers, Big Block marine work and Small Block restricted-carburetor circle-track applications, it uses XH-432 XtremeAlloy construction with chrome stems, hard tips, swirl-polished underheads and fully machined combustion faces to improve airflow and combustion efficiency under extreme conditions.
Manley Chevrolet Big Block Exhaust Valve Kit - 1.880in Head Dia. 5.454in O/A Length, 0.3715in Stem
