Manley 11634-8 Stainless Steel Performance Engine Valve 44.5mm Head

The Manley 11634-8 is a high-performance stainless steel engine valve engineered to deliver superior flow, durability, and precision fitment. With over 40 years of manufacturing excellence, Manley Performance has established itself as the industry standard for aftermarket valves — from mild street builds to 1,000+ horsepower race applications.

Valve Specifications:

• Head Diameter: 44.5 mm
• Stem Diameter: 0.2750"
• Overall Length: 4.630"
• Tip Length: 0.470"
• Underhead Angle/Radius: 10 x 3/8"
• Margin: 0.050"
• Seat Width: 0.080"
• Top of Head: 5 Dish
• Installed Height: Stock
• Weight: 77g (0.170 lbs)

Key Features:

• Manufactured from Manley's proven Race Series stainless steel alloy for exceptional strength and corrosion resistance
• Chrome-plated stem for reduced friction and long-term durability
• Swirl-polished underhead geometry promotes optimized airflow into the combustion chamber
• Fully hardened tip for consistent rocker arm contact and reduced wear
• Completely machined combustion face for a precise, repeatable seal
• Tightly controlled margin heights and exact stem-to-seat concentricity for a superior finished product
• Pro-Flo design reduces stem diameter in the fillet area, increasing airflow while minimizing valve weight

Manley stainless steel valves are designed to outperform in even the most demanding environments — from daily-driven street cars to all-out race engines. Each valve undergoes strict quality control to ensure it meets the exacting tolerances required by high-performance engine builders.