BBC 325cc Pro-1 Head 121cc R/P 2.25/1.88 Bare

The BBC 325cc Pro-1 Head 121cc R/P 2.25/1.88 Bare cylinder head is engineered for serious big-block Chevrolet engine builders targeting high-flow performance and maximum cylinder head potential. This bare casting is ideal for builders who want complete control over the porting, polishing, and valve train configuration without factory compromises or unwanted modifications.

At its core, the BBC 325cc Pro-1 Head features 325 cubic centimeters of intake runner volume, optimized for efficient fuel and air delivery across a broad RPM range. The 121 cubic centimeter combustion chamber, combined with the 2.25-inch intake and 1.88-inch exhaust valve sizing, delivers a proven platform that balances scavenging efficiency with flow characteristics. As a bare head casting, you receive the raw component without valves, springs, or guides installed, allowing custom valve selection, spring rates, and pushrods tailored to your specific engine combination and intended application.

The substantial 33.94-pound weight reflects the robust iron construction necessary for street durability and sustained performance demands. Experienced engine builders and performance shops will find this Pro-1 architecture provides the foundation for substantial horsepower gains and improved breathing efficiency, making it suitable for street performance engines, competition platforms, or classic muscle car restorations.