BBC 300 CFM CNC Cylinder Heads (pr) O/P Assem.

The BBC 300 CFM CNC Cylinder Heads from Air Flow Research are designed for serious big-block Chevy engine builders and hot rodders who seek maximum flow efficiency. These cylinder heads are engineered to deliver professional-grade performance, making them ideal for applications ranging from street engines to high-performance competition platforms.

Crafted with CNC-ported precision, these heads ensure consistent and repeatable power across the entire RPM range. The 300 CFM flow rating indicates optimized flow characteristics, supporting aggressive cam profiles and fuel injection systems while maintaining street drivability. The open-chamber design enhances combustion efficiency, and the durable cast nodular iron construction withstands high-boost conditions and repeated heat cycling.

These cylinder heads are perfect for BBC applications with displacements ranging from 427 to 496 cubic inches. They pair seamlessly with modern fuel injection, carbureted, or forced-induction setups, making installation straightforward on existing big-block Chevy engines. The included outlet assembly ensures compatibility with standard BBC bolt patterns and gasket surfaces.