S/D 2.350 Intake Valve

The S/D 2.350 Intake Valve from Manley is engineered for serious engine builders and performance enthusiasts who demand precision valve components. This intake valve serves as a critical flow control element in high-revving and modified engines where stock valves fall short of volumetric efficiency requirements. Whether you're building a street performance engine, preparing for track duty, or restoring a classic with modern power goals, the S/D 2.350 delivers the durability and design consistency that separates quality builds from compromises.

Manley's S/D (Super Duty) designation indicates enhanced material composition and manufacturing tolerances designed to withstand elevated cylinder pressures, aggressive cam profiles, and extended operating RPM ranges. The 2.350-inch head diameter provides optimized flow characteristics for engines requiring larger valve seats without excessive weight penalty. Premium valve steel construction ensures resistance to thermal stress and valve seat recession, critical factors when running higher compression ratios or forced induction systems. Precision machining and shot-peening processes improve fatigue resistance and longevity under demanding conditions, making this valve suitable for both naturally aspirated and boosted applications.

Engine builders, machine shops, and dedicated enthusiasts rely on Manley intake valves for cylinder head refreshes on performance-modified engines spanning multiple platforms and displacements. The 2.350-inch diameter pairs effectively with competition-grade valve seats and spring packages in applications where flow efficiency directly impacts horsepower and torque delivery. Installation requires proper valve seat machining, correct installed height setup, and matching with compatible rocker arms or lifter geometry—tasks best handled by experienced builders familiar with your specific engine platform. Verify compatibility with your cylinder head casting, valve seat pocket dimensions, and overall engine specifications before ordering.