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