LS1 P/F 2.000in Intake Valve

The MANLEY LS1 P/F 2.000in Intake Valve (MPN 11360-1) is a precision race-spec intake valve engineered for LS1 and LS2 engine platforms in GM LS-Series applications. This stainless steel valve is designed for high-RPM, high-load cylinder head environments where stock components fall short of performance demands. The 2.000-inch head diameter and 0.313-inch valve stem are OEM-compatible dimensions, ensuring direct installation into factory-spec valve seats while delivering superior flow characteristics and durability under sustained boost and aggressive tuning.

MANLEY's Race Flo intake valve geometry optimizes breathing efficiency across the full RPM band, critical for forced-induction and naturally aspirated power builds pushing beyond factory limits. The 4.874-inch length accommodates standard pushrods and rocker geometry without modification. Stainless steel construction resists thermal cycling and chemical corrosion from fuel additives and combustion byproducts, maintaining valve face sealing integrity through extended track sessions and street duty. Each valve ships individually, allowing targeted replacement of worn or damaged components during head rebuilds or performance upgrades.

This intake valve serves engine builders, performance shops, and LS-platform enthusiasts undertaking cylinder head work—from mild street cam packages to competition-level boosted setups. Proper valve seat matching and installation in a properly prepared head is essential for reliable sealing and long-term performance. MANLEY components are specified across professional racing programs where repeatability and durability under extreme conditions determine success.

The LS engine family continues as the dominant platform for high-performance builds across street, strip, and circuit applications. OEM intake valves often limit peak power in modified engines; upgrading to purpose-built race components like this MANLEY valve ensures the cylinder head can support intended power targets without sacrificing reliability or sealing consistency.