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 LS-1/LS-2 (LS-6) Head Small Block Severe Duty/Pro Flo Hollow Intake Valves (Set of 8)
Head Diameter: 2.080 in. - Stem Diameter: .3133 in. - O/A : 4.874 - Hollow Stem
Severe Dty. Intake Vlv Kit - Chevrolet Gen III/IV Small Block - LS1, LS2, LS8
Swirl polishing and machined faces improved airflow/optimized efficiency
Exotic alloys for superior tensile strength, reliability, and longevity
Manley Valve - Intake, Valve-LS1 P/F 2.080 HOLLOW.
Manley Valve - Intake, Valve-LS1 P/F 2.080 HOLLOW
Proven fatigue strength for extreme performance
Chrome stems and hard tips enhance durability
Valve-LS1 P/F 2.080 HOLLOW
Engine Intake Valve
Valve - Intake
