Manley 11636B-8 Ford 4.6L Modular Race/Marine 44.5mm Black Nitrided Intake Valve

The Manley 11636B-8 is a high-performance intake valve engineered for Ford 4.6L Modular engines used in race and marine applications. Featuring a 44.5mm head diameter and a durable Black Nitrided (B/L) finish, these valves are built to withstand the extreme heat cycles and elevated RPM demands of performance and marine engine builds.

Manley's Black Nitriding treatment significantly increases surface hardness and wear resistance at the valve stem and face, reducing friction against the valve guide and seat while improving corrosion resistance — a critical advantage in marine environments. This surface treatment also helps the valve retain lubrication more effectively under high-load conditions.

Key Features:

• 44.5mm head diameter for optimized intake flow on the Ford 4.6L Modular platform
• Black Nitrided finish for enhanced hardness, wear resistance, and corrosion protection
• Race/Marine (R/M) specification — designed for high-RPM and high-heat environments
• Manufactured from high-quality one-piece forged stainless steel for superior strength and longevity
• Precision-machined stem for consistent fit in OEM and performance valve guides

Manley Performance is a trusted name in professional engine building, supplying race teams and performance engine builders with valvetrain components across drag racing, circle track, road racing, and marine applications. The 11636B-8 is a direct upgrade over OEM valves for builders seeking improved durability and performance from the Ford 4.6L Modular engine.