Manley Performance Pro Flo Exhaust Valves 40,000 PSI Fatigue Tested

Manley Performance Pro Flo Exhaust Valves — 40,000 PSI Fatigue Tested Engineered for extreme duty , the Manley Performance Pro Flo Exhaust Valves are designed for high-temperature gasoline engines and severe duty applications. Proven in laboratory testing, these valves withstand the intense stresses of modern performance engines. Key Benefits Exceptional fatigue life: Tested at 40,000 psi and 1400°F , surviving up to 100,000,000 cycles —far outperforming typical competitor valves. High-temperature strength: Proprietary XH-428 exhaust material retains nearly double the ultimate tensile strength at 1500°F versus common alternatives. Durable construction: Chrome stems and hard tips provide superior wear resistance and long service life. Optimized combustion: Swirl-polished under-head areas and fully machined combustion faces improve airflow, sealing, and combustion efficiency. Complementary intake material: NK-844 intake material offers outstanding high-temperature tensile strength (over 4× better at 1000°F vs. competing intake alloys). Why Choose Manley Pro Flo Valves? When valves are subjected to seat bounce and extreme loads—routinely reaching 40,000–60,000 lbs—component durability is critical. Manley’s Pro Flo valves deliver unmatched reliability, strength, and thermal stability for racing, forced induction, and high-RPM applications. Upgrade your valvetrain with valves proven to resist failure under the harshest conditions and keep your engine performing at peak levels.