Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo/Severe Duty Exhaust Valve (Single) - 12361-1

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 L83 53L 1.560, .3136 STEM
• Exhaust, Valve-S/D L83 5.3L 1.560, .3136 STEM
• O/A Length: 5.208
• Valve Length: 5.208
• Valve Tip Length: 0.160
• Tip Length: 0.160
• Margin Width: 0.065
• Seat Width: 0.110
• Top of Head: 18 Degree Dish
• Valve Head Shape: 18 Degree Dish
• Underhead Angle: 25.00
• Underhead Radius: 7/16
• Valve Series: Severe Duty? Series
• Valve Material: Stainless Steel
• Valve Type: Exhaust
• Product Type: Engine Exhaust Valve
• Valve Quantity: 1
• Engine Valve Quantity: 1
• Industry: Automotive
• Out of Stock Message: Call for Availability
• Title: Manley Valve - Exhaust, Valve-S/D L83 5.3L 1.560, .3136 STEM
• Prop 65 Yes/No: Yes
• Prop 65 (C, R or CR): CR
• Prop 65 - Short Label: Prop 65 Warning Label.JPG