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