BBM 240 Cylinder Head 78cc Assembled

The BBM 240 Cylinder Head 78cc Assembled is a high-performance drop-in cylinder head engineered for Mopar B and RB-series engines, delivering the displacement and combustion efficiency demanded by vintage muscle car enthusiasts and performance rebuilds. This fully assembled unit eliminates machine-shop downtime and integration complexity, providing a ready-to-bolt solution for engine builders who prioritize reliability and proven power delivery. Built for drivers seeking authentic 1960s–1970s platform performance without compromise, the BBM 240 represents the intersection of OEM-specification engineering and modern assembly standards.

This cylinder head features a 240 cubic centimeter intake port paired with a 78 cubic centimeter combustion chamber, optimized for the breathing characteristics of classic B and RB-series platforms. The dual-valve design incorporates 2.190-inch intake and 1.760-inch exhaust valves with 1.460-inch valve springs, balancing flow dynamics for consistent performance across a broad RPM range. Aluminum construction delivers thermal conductivity superior to cast iron while maintaining structural integrity under sustained high-boost or high-RPM operation. The straight-plug configuration ensures compatibility with original and period-correct ignition systems, and full assembly—from valve seats to spring retainers—eliminates the risk of incomplete or mismatched components that plague used cores.

Professional engine builders, muscle car restoration specialists, and hot-rodders targeting Mopar B and RB platforms will find the BBM 240 essential for street, strip, or show builds. Direct bolt-on compatibility with 1962–1979 B-series and 1958–1979 RB-series engines eliminates machine-work variables and accelerates assembly timelines. The 35.1-pound weight and compact footprint (10 x 9 x 23.5 inches) facilitate shipping and storage while maintaining the thermal mass required for consistent detonation control. Verify exact year and displacement of your Mopar engine block before ordering to ensure optimal gasket sealing and port alignment.