Manley Performance Chevy LS-7 Small Block Severe Duty Exhaust Valves Set of 8

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 Valve - Exhaust, Valve-LS7 S/D 1.615.

• Swirl polishing and machined faces improved airflow/optimized efficiency
• Exotic alloys for superior tensile strength, reliability, and longevity
• Proven fatigue strength for extreme performance
• Chrome stems and hard tips enhance durability

Upgrade your engine's performance with the Manley Performance LS-7 Small Block Severe Duty Exhaust Valves. Crafted from exclusive materials such as XH-428 and NK-844 alloys, these valves offer exceptional tensile strength, making them ideal for high-temperature racing and demanding automotive applications. Designed to withstand extreme conditions, they feature chrome stems, hard tips, and swirl-polished underheads that improve airflow and optimize engine efficiency. These enhancements contribute to better combustion, increased horsepower, and sustained durability during intense engine operation.
Built for precision and longevity, each valve is fully machined with combustion faces that promote superior airflow and wear resistance. Extensive fatigue testing has demonstrated their exceptional durability, withstanding over 100 million cycles at 40,000 psi and 1400°F, far surpassing typical industry standards. This makes them a reliable choice for high-performance engines requiring consistent, race-winning strength. Whether you’re building a race engine or upgrading your daily driver, these valves deliver the reliability and endurance you need.
Designed and manufactured by Manley Performance, these valves are an ideal upgrade for those demanding maximum performance from their LS-7 small block engine. The set includes eight valves, ensuring a comprehensive upgrade for your engine's exhaust system. With their proven durability and optimized airflow design, they are the perfect choice for enthusiasts who prioritize engine efficiency, longevity, and performance in demanding conditions.

Features:

• Swirl polishing and machined faces improve airflow and engine efficiency

• Exotic alloys XH-428 (exhaust) and NK-844 (intake) offer superior tensile strength and durability

• Proven fatigue strength with over 100 million cycles at 40,000 psi and 1400°F

• Chrome stems and hard tips enhance durability and wear resistance

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1