BBM R/M 1.940 Exhaust Valve

The Manley BBM R/M 1.940 Exhaust Valve is a race-grade valve engineered for high-performance Mopar 426 Hemi engine builds. This 1.940-inch head diameter exhaust valve combines precision stainless construction with specifications optimized for sustained high-RPM operation and maximum flow characteristics demanded in competitive and performance engine applications.

Manley's Race Master valve series is recognized for exacting manufacturing tolerances and material selection. The 0.308-inch valve stem diameter provides the proper seat contact area and thermal conductivity for sustained combustion cycles, while the 4.865-inch overall length ensures correct seating depth and margin geometry in Hemi cylinder heads. Stainless steel construction resists corrosion and thermal fatigue at extreme operating temperatures typical of race engines. Each valve is individually manufactured to specification, with no assembly required—ready for installation upon receipt.

This exhaust valve is specified for Mopar 426 Hemi platforms where port velocity, flow optimization, and durability under sustained boost or high-rev conditions are critical. The 1.940-inch head size balances exhaust scavenging efficiency with structural integrity. Builders restoring vintage performance engines, developing street-strip combinations, or supporting competitive motorsports programs depend on Race Master valves to maintain head integrity and performance consistency across multiple heat cycles.

Manley valves are engineered for engines where precision and reliability directly impact lap times and durability. The BBM R/M 1.940 exhaust valve meets the exacting demands of serious Hemi builders and is sold individually, allowing customers to specify exact quantities for complete valve train assemblies.