Manley Performance Severe Duty Exhaust Valves 40,000 PSI Fatigue Tested

Manley Performance Severe Duty Exhaust Valves — 40,000 PSI Fatigue Tested Engineered for extreme duty , Manley Performance Severe Duty Exhaust Valves are built to withstand the highest stresses and temperatures found in modern high-performance gasoline engines. Proven in controlled fatigue testing at 40,000 psi and 1400°F , these valves survived up to 100,000,000 cycles , outperforming competitors by orders of magnitude. Key Features Extreme fatigue resistance — Validated endurance at 40,000 psi; sustained life under repeated seat impact and high-stress operation. High-temp materials — Unique XH-428 exhaust material offers nearly double the ultimate tensile strength at 1500°F versus typical EV-8 alternatives. Precision intake option — NK-844 intake material provides exceptional strength at elevated temps, outperforming rival intake alloys. Durable construction — Chrome stems and hard tips for superior wear resistance and extended service life. Optimized flow — Swirl-polished under-head areas and fully machined combustion faces for improved airflow and combustion efficiency. Why Choose Manley Severe Duty For racers, builders, and performance enthusiasts demanding long-term reliability under extreme conditions, these valves deliver unmatched tensile strength, heat resistance, and proven fatigue life. Choose Manley for components that keep high-temperature engines running stronger, longer.