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.
Severe Dty. SBC Ex. Vlv Kit - 1.600 in. Head Dia.,4.911 in. O/A ,.3415 in. Stem
Swirl polishing and machined faces improved airflow/optimized efficiency
Exotic alloys for superior tensile strength, reliability, and longevity
Manley SBC 1.600 Severe Duty Exhaust Valves (Set of 8)
Proven fatigue strength for extreme performance
Chrome stems and hard tips enhance durability
Manley Valve - Exhaust, Valve-SBC S/D 1.600.
Manley Valve - Exhaust, Valve-SBC S/D 1.600
Engine Exhaust Valve
Valve-SBC S/D 1.600
Valve - Exhaust
