SB Chevrolet 180cc Aluminum Cylinder Heads. Fits 4.00" and larger bore. 2.02" intake, 1.60" exhaust. 70cc combustion chambers. Manufactured from A356-T6 aluminum, they feature bronze guides, straight plug design and can accept center bolt or perimeter bolt valve covers. Assembled with 1.25" OD springs for hydraulic flat tappet (non-roller) cams up to .525" lift. Each pair comes assembled with a detailed flow sheet and assembly blueprint. Vacuum tested. Download Data here -
DOWNLOAD Sold as pairs.