Increased airflow volume and speed are essential for drag racing and powerboat applicationshat seek to improve horsepower and torque. The Pro Elite Aluminum Cylinder Heads are CNC-ported to maximize airflow and ensure port-to-port consistency in runner shapes and sizes. The CNC-ported intake and exhaust runners optimize both the air volume and speed while the CNC-ported combustion chambers relieve the valve shrouding that commonly occurs inas castchambers. With more standard features than any Big Block Chevy head in the aftermarket the Pro Elite series is sure to give your Big Block Chevy the boost in horsepower and performance it deserves.