SBC R/M 1.600in Exhaust Valve

The SBC R/M 1.600in Exhaust Valve from MANLEY is a precision-engineered intake or exhaust valve purpose-built for small-block Chevrolet engine builds and high-performance modifications. This valve serves as a critical component in any serious SBC cylinder head upgrade, whether you're building a street engine, strip-focused race motor, or restomod application. Designed for engines requiring exact valve sizing and superior heat rejection, the 1.600-inch head diameter makes this valve compatible with popular SBC R/M (Race/Modified) cylinder head configurations that demand OEM or better reliability under boost, nitrous, or naturally aspirated high-RPM conditions.

MANLEY exhaust valves are forged from premium stainless steel or chrome-moly alloys engineered to withstand extreme combustion temperatures and thermal cycling without warping, cracking, or losing sealing geometry. The 1.600-inch diameter specification optimizes flow characteristics while maintaining structural integrity during sustained high-load operation—critical for forced-induction builds or competition engines running extended dyno sessions or track events. The valve's stem diameter and head-to-stem ratio are precisely calculated to work within R/M head casting tolerances, ensuring proper valve-guide clearance and reliable seating. MANLEY's manufacturing process includes rigorous dimensional inspection and hardness verification, guaranteeing that each valve meets exacting aerospace-grade standards.

This SBC R/M 1.600in Exhaust Valve is ideal for engine builders, performance shops, and enthusiasts restoring or upgrading small-block Chevrolet heads—particularly those working with Edelbrock, Trick Flow, or factory Performance R/M castings. Installation requires standard valve-spring changes and proper shimming or lash adjustment depending on your lifter type and camshaft profile. Always replace valve seats and verify chamber volumes when switching valve sizes, and confirm compatibility with your specific cylinder head casting before purchase. Pair this valve with matching intake valves, quality springs, retainers, and locks to ensure balanced combustion and longevity across the entire RPM range your build demands.