Brodix 2031016 BB-3 Xtra cylinder head for Big Block Chevy engines. Assembled with 2.300in intake and 1.880in exhaust valves, 345cc intake runner, and 119cc chamber. Features 1.645in springs, angle plugs, and A-356 aluminum construction. Flows over 415 cfm as cast, designed for pro-street racing with out-of-the-box horsepower. Sold as each.