Brodix 1321001 Dragon Slayer cylinder heads for Small Block Chevy engines. Assembled with 2.080in intake and 1.600in exhaust valves, 225cc intake runner, and 68cc chamber. Features 1.550in springs with steel retainers for roller cams, angle plugs, and A-356 aluminum construction. Designed for drag racing, offering increased airflow and horsepower. Sold as a pair.