Chevrolet Performance 19419908 - RS-X Spread-Port Aluminum Cylinder Head, CNC-ported - Bare

Includes: - Fully machined and assembled - 449cc intake port - 161cc exhaust port - Intake port volume (nominal): 449 cc - Exhaust port volume (nominal): 161 cc - Chamber volume (nominal0): 70 cc - Intake flow: 481 cfm @ 0.787" - Exhaust flow: 347 cfm @ 0.787" - Rocker bar required - Designed for shaft-mount roller rocker arms - Designed for 7/16" pushrods - Requires custom exhaust headers