Performance World 60170-CNCA SB Ford CNC Aluminum Heads (complete)

SB Ford 170cc (with 5-axis CNC bowl blend) Aluminum Cylinder Heads. 2.02" intake, 1.60" exhaust, 60cc combustion chambers. Manufactured from A356-T6 aluminum. 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. NOTE: Not for use with factory pistons. Check piston to valve clearance in all applications.