Performance World 64200-CNCA-2 SB Chevrolet CNC Aluminum Heads (complete)

SB Chevrolet 200cc (with 5-axis CNC bowl blend) 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. Assembled with 1.47" OD springs for hydraulic roller cams up to .625" lift. Requires 7/16" stud rocker arms. Each pair comes assembled with a detailed flow sheet and assembly blueprint. Vacuum tested. Sold as pairs. Download Data here - DOWNLOAD