SBC R/M 1.940in Intake Valve

The MANLEY SBC R/M 1.940in Intake Valve (part number 11860-1) is a precision-engineered component designed for small-block Chevrolet engine builders and performance enthusiasts seeking reliable, high-flowing intake valves. This valve serves as a critical upgrade path for stock engine rebuilds, mild stroker combinations, and naturally aspirated performance builds where improved breathing and durability matter.

Built to OEM specifications with modern metallurgy, the 1.940-inch head diameter on this intake valve is engineered to maximize flow while maintaining structural integrity under sustained RPM and combustion pressure. MANLEY's proven heat-treated steel composition resists warping, burning, and seat recession—common failure modes in stock valves pushed beyond their design limits. The R/M designation indicates this valve meets racing and modified engine specifications, offering superior hardness and surface durability compared to standard OEM pieces.

This intake valve is most beneficial for builders upgrading cylinder heads with compatible aftermarket or ported heads, as well as those looking to enhance the performance of their small-block Chevrolet engines. The compact weight ensures minimal inertial load on your valvetrain, reducing stress on pushrods, rocker arms, and cam lobes during high-lift, high-RPM operation, ultimately supporting your power goals without compromise.