BBC 357cc CNC Alum Heads Magnum 121cc Assembled

The Air Flow Research BBC 357cc CNC Aluminum Heads Magnum 121cc Assembled is a precision-engineered upgrade designed for serious big-block Chevy builders who demand maximum flow and reliability. These cylinder heads are ideal for high-performance street, strip, and competition engines, where every cubic centimeter of displacement and fuel efficiency is crucial.

Constructed from CNC-ported aluminum, these heads are optimized for peak volumetric efficiency across the RPM band, featuring a 357cc intake port volume and a 121cc combustion chamber. This design ensures port-to-port consistency, eliminating the hand-port variation found in lesser aluminum heads, and allows for compatibility with both carbureted and fuel-injected systems.

These heads are suitable for BBC platforms ranging from 427 to 632 cubic inches, making them versatile for various applications, including restomods and bracket racing. When paired with appropriate fuel mapping and ignition tuning, they integrate seamlessly with modern EFI systems and traditional carburetors, providing the performance needed for serious enthusiasts.