Brodix 2021024 BB-2 Xtra cylinder head for Big Block Chevy engines. Assembled with 2.300in intake and 1.880in exhaust valves, 365cc intake runner, and 119cc chamber. Features 1.550in springs, angle plugs, and A-356 aluminum construction. Designed for high-performance racing, offering increased airflow and horsepower for drag racing applications. Sold as each.