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.
Head Diameter: 2.165 in. - Stem Diameter: 0.3133 in. - O/A : 5.200 in. - Hollow Stem
Manley Chevy L-99 Severe Duty Series 2.165in Head Diameter Intake Valve (Single)
Manley Severe Dty. Intake Vlv - Chevrolet Gen IV Small Block - LS3, L92, L99
Swirl polishing and machined faces improved airflow/optimized efficiency
Exotic alloys for superior tensile strength, reliability, and longevity
Manley Valve - Intake, Valve-L-92 P/F 2.165, +.300 HOLLOW.
Manley Valve - Intake, Valve-L-92 P/F 2.165, +.300 HOLLOW
Proven fatigue strength for extreme performance
Chrome stems and hard tips enhance durability
Valve-L-92 P/F 2.165, +.300 HOLLOW
Engine Intake Valve
Valve - Intake
