Manley Intake Valves Discover the pinnacle of performance and racing excellence with Manley's Severe Duty Valves. Exhaust valves crafted from XH-428 material, these valves stand as a testament to their unwavering commitment to superiority in the industry. Severe Duty Valves outshine the competition in every aspect. these valves have gone under rigorous fatigue tests and also are designed fro high tempurature gasoline engines. The chrome stems and hard tips are for ehanced durability and longevity. |