Performance World 64200-CNC SB Chevrolet CNC Aluminum Heads (bare)

SB Chevrolet 200cc (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 an 8% increase in flow on the intake and a WHOPPING 33% increase on the exhaust over the non-ported 64200. 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. Ready for assembly and sold as pairs.Download Data here - DOWNLOAD Download Installation Tech here - DOWNLOAD