BBM R/M 1.940 Exhaust Valve

The Manley BBM R/M 1.940 Exhaust Valve is a precision-engineered, race-grade valve designed for serious engine builders and performance enthusiasts who demand maximum reliability under extreme conditions. Built for high-revving naturally aspirated and forced-induction engines, this exhaust valve serves as a critical upgrade path for those pushing past stock limitations and seeking competition-level durability.

The BBM R/M 1.940 features a 1.940-inch head diameter, optimized for mid-range displacement engines requiring balanced scavenging and thermal management. The proprietary Borderline Metallurgy alloy composition resists thermal fatigue, corrosion, and erosion, ensuring durability even under sustained high-temperature cycles typical of competition environments. The R/M (Race/Modified) series undergoes tighter tolerances and more rigorous quality control than standard valves, ensuring consistent sealing geometry and repeatable performance.

Engine builders will benefit from the installation of the Manley BBM R/M 1.940 Exhaust Valve, which requires proper valve seat machining and alignment with corresponding intake valve specifications for your engine platform. This valve is ideal for those building dedicated track cars, preparing for road racing, or engineering show engines, delivering the quality and consistency that professional shops and OEM manufacturers trust.