Brodix 1171000 BR 7 series cylinder heads for GM LS-Series engines. Assembled with 2.204in intake and 1.614in exhaust valves, 262cc intake runner, and 71cc chamber. Features 1.350in springs, angle plugs, and A-356 aluminum construction. Designed for high-performance racing, offering increased airflow and horsepower for street-strip applications. Sold as a pair.