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 Exhaust Valve Kit - 1.600in Head Dia. 4.950in O/A Length, 0.3136in Stem
Severe Dty. SBC Ex. Vlv Kit - 1.600 in. Head Dia.,4.950 in. O/A ,.3136 in. Stem
Swirl polishing and machined faces improved airflow/optimized efficiency
Exotic alloys for superior tensile strength, reliability, and longevity
Manley Valve - Exhaust, Valve-S/D 1.600, .3136 STEM .
Manley Valve - Exhaust, Valve-S/D 1.600, .3136 STEM
Proven fatigue strength for extreme performance
Chrome stems and hard tips enhance durability
Valve-S/D 1.600, .3136 STEM
Engine Exhaust Valve
Valve - Exhaust
