BBM R/M 1.940in Exhaust Valves

The BBM R/M 1.940in Exhaust Valves by Manley represent purpose-built components engineered for high-performance Mopar 426 Hemi engine builds. These race-grade exhaust valves are designed for users who demand maximum flow efficiency and durability under extreme combustion conditions, whether in vintage muscle car restoration, drag racing, or serious engine performance applications. Built to OEM specifications yet optimized for competition use, this eight-piece set delivers the precision control needed when peak horsepower and reliability are non-negotiable.

Each valve features a 1.940-inch head diameter paired with a 0.308-inch valve stem, engineered to optimize exhaust gas scavenging and minimize restriction in the cylinder head port. Constructed from stainless steel, these valves resist thermal fatigue and corrosion while maintaining structural integrity across repeated high-heat cycles—critical when intake charge temperatures approach 900°F. The 4.865-inch overall length ensures proper seating geometry and clearance margins within the Hemi's specific valve train architecture, while the Race Master designation confirms Manley's commitment to competitive-grade material selection and dimensional tolerancing.

Builders restoring or upgrading 426 Hemi engines will find this set indispensable for any build prioritizing cylinder head flow and longevity. Complete set of eight ensures matched performance across all cylinders, eliminating asymmetric combustion issues that can compromise drivability and durability. These valves are compatible exclusively with Mopar 426 Hemi platforms and should be installed by experienced technicians familiar with Hemi valve train specifications and proper seat checking procedures.