Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.
Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo/Severe Duty Exhaust Valves (Set of 8)
Severe Dty. Chevy 6.2L LT1 Ex. Vlv Kt-1.590 in. ,5.205 in. O/A ,.3136 in. Stm
Swirl polishing and machined faces improved airflow/optimized efficiency
Exotic alloys for superior tensile strength, reliability, and longevity
Manley Valve - Exhaust, Valve-S/D LT1 6.2L 1.590, .3136 STEM.
Manley Valve - Exhaust, Valve-S/D LT1 6.2L 1.590, .3136 STEM
Proven fatigue strength for extreme performance
Chrome stems and hard tips enhance durability
Valve-S/D LT1 6.2L 1.590, .3136 STEM
Engine Exhaust Valve
Valve - Exhaust
