Performance World 64180-CNC SB Chevrolet CNC Aluminum Heads (bare)

SB Chevrolet 180cc (with 5-Axis CNC Bowl Blend) Bare Aluminum Cylinder Heads. Fits 4.00" and larger bore. 2.02" intake, 1.60" exhaust, 64cc combustion chambers. These heads offer a huge increase in flow over the non-ported 64180. Manufactured from A356-T6 aluminum, they feature bronze guides, straight plug design and can accept center bolt or perimeter bolt valve covers. Each head comes with a detailed flow sheet. Download Data here - DOWNLOAD Ready for assembly and sold as pairs. Download Installation Tech here - DOWNLOAD