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The Manley Severe Duty exhaust valve for Chevrolet Big Block engines delivers exceptional strength and high-temperature durability for demanding gasoline applications. Constructed from exclusive alloys (XH-428 for exhaust, NK-844 for intake) with chrome stems, hard tips, swirl-polished underheads and fully machined combustion faces, these valves improve airflow, efficiency and wear resistance. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles while competitors failed after 100,000.
Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 6.450in O/A Length, 0.3415in Stem
