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 Big Block Exhaust Valve Kit - 1.900in Head Dia. 5.522in O/A Length, 0.3110in Stem
Severe Dty. BBC Ex. Vlv Kit - 1.900 in. Head Dia.,5.522 in. O/A ,.3110 in. Stem
Swirl polishing and machined faces improved airflow/optimized efficiency
Exotic alloys for superior tensile strength, reliability, and longevity
Proven fatigue strength for extreme performance
Manley Valve - Exhaust, Valve-S/D 1.900,+.100.
Manley Valve - Exhaust, Valve-S/D 1.900,+.100
Chrome stems and hard tips enhance durability
Manley Valve - Exhaust, Valve-S/D 1.900,+100
Valve-S/D 1.900,+.100
Engine Exhaust Valve
Valve - Exhaust
