Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.540in O/A Length, 0.3110in Stem - 11359-8

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.

Features

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

Specs

• Manley Valve
• Exhaust, Valve-S/D 1.600,+600
• Exhaust, Valve-S/D 1.600,+.600
• Product Market: Domestic
• Head Diameter: 1.600
• Valve Head Diameter: 1.600
• Stem Diameter: 0.3110
• Valve Stem Diameter: 0.3110
• O/A Length: 5.540
• Valve Length: 5.540
• Valve Tip Length: 0.290
• Tip Length: 0.290
• Margin Width: 0.080
• Seat Width: 0.100
• Top of Head: 9 Degree Dish
• Valve Head Shape: 9 Degree Dish
• Underhead Angle: 15.00
• Underhead Radius: 1/2
• Valve Series: Severe Duty? Series
• Valve Material: Stainless Steel
• Valve Type: Exhaust
• Product Type: Engine Exhaust Valve Kit
• Valve Quantity: 8
• Engine Valve Quantity: 8
• Industry: Automotive