BBC 385cc CNC Alum Heads Magnum 121cc Assembled

The BBC 385cc CNC Alum Heads Magnum 121cc Assembled by Air Flow Research is a high-performance solution for serious big-block Chevy builders who demand maximum flow efficiency without the complexities of custom porting. These cylinder heads are designed for engines exceeding 500 horsepower, making them suitable for competitive street, strip, and performance applications where optimal airflow is crucial for power generation.

Constructed from premium aluminum and finished with CNC precision machining, these heads feature a Magnum chamber design with a combustion volume of 121cc. The intake port volume is 385 cc, which maximizes fuel-air mixture velocity across the RPM range while ensuring excellent atomization characteristics. Air Flow Research's meticulous CNC work guarantees that every valve seat, port surface, and chamber contour meets tight tolerances, eliminating the need for secondary porting.

These fully assembled heads are compatible with BBC applications running compression ratios from 10:1 to 12.5:1, making them ideal for naturally aspirated big-block engines. Whether you're building a restomod or a dedicated race engine, these heads provide the performance and reliability needed to meet modern demands.