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The Manley Severe Duty hollow intake valve for Chevrolet big-block engines features a 2.250in head diameter, 5.494in overall length and a 0.3110in stem, designed to reduce reciprocating mass in high-rpm builds. Manley uses NK-844 intake alloy with swirl-polished underheads and machined combustion faces, plus chrome stems and hard tips for improved airflow and longevity; Severe Duty valves are validated for exceptional fatigue life under extreme testing.
Manley Chevrolet Big Block Intake Valve Kit - 2.250in Head Dia. 5.494in O/A Length, 0.3110in Stem
