BBC 315cc Alum Heads Magnum 121cc Assembled

The BBC 315cc Alum Heads Magnum 121cc Assembled cylinder head from Air Flow Research represents a performance-engineered solution for big-block Chevrolet engine builds. Purpose-designed for high-output applications requiring superior airflow characteristics and reliable combustion chamber geometry, this assembled pair delivers the precision engineering demanded by engine builders, restoration specialists, and performance enthusiasts. The pre-assembled configuration eliminates guesswork and installation variables, ensuring consistent valve timing and spring preload across both heads.

Constructed from premium aluminum alloy, the BBC 315cc Alum Heads feature a 315 cubic centimeter intake port volume paired with a compact 121 cubic centimeter combustion chamber, optimizing the intake charge velocity and flame propagation characteristics critical for efficient fuel burn. The 2.250-inch intake and 1.880-inch exhaust valve configuration provides maximum breathing capacity while maintaining structural integrity. Angle-plug design positions the spark plug for optimal ignition geometry, reducing flame travel distance and promoting complete combustion. The 1.625-inch valve spring package is engineered to manage valve float across a wide RPM range, ensuring durability under sustained high-load conditions typical of street performance and racing applications.

Professional engine builders and restoration specialists benefit most from this complete assembled solution, particularly when constructing or refreshing big-block Chevrolet powerplants requiring modern performance standards without sacrifice of originality. The pair configuration addresses both sides of the engine simultaneously, guaranteeing symmetrical port flow and balanced cylinder-to-cylinder performance. Installation requires proper deck surface preparation and standard gasket sealing procedures; compatibility is assured across all BBC applications utilizing conventional manifold configurations and standard spark plug access requirements.