Brodix 1008104 Track 1 KC cylinder heads for Small Block Chevy engines. CNC ported for maximum consistency, assembled with 2.080in intake and 1.600in exhaust valves, 227cc intake runner, and 68cc chamber. Features 1.550in springs, angle plugs, and A-356 aluminum construction. Designed for drag or oval track racing, offering enhanced airflow and horsepower. Sold as a pair.