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 Chevrolet Small Block Intake Valve Kit - 2.080in Head Dia. 4.935in O/A Length, 0.3133in Stem
Severe Dty. SBC Int. Vlv Kit - 2.080 in. Head Dia.,4.935 in. O/A ,.3133 in. Stem
Swirl polishing and machined faces improved airflow/optimized efficiency
Exotic alloys for superior tensile strength, reliability, and longevity
Manley Valve - Intake, Valve-P/F 2.080, .3133 STEM .
Manley Valve - Intake, Valve-P/F 2.080, .3133 STEM
Proven fatigue strength for extreme performance
Chrome stems and hard tips enhance durability
Valve-P/F 2.080, .3133 STEM
Engine Intake Valve
Valve - Intake
