Performance World 63171A SB Mopar 171cc Cylinder Heads pair (Complete)

SB Mopar 171cc Complete Aluminum Cylinder Heads. 63cc Combustion Chamber. CNC pocket ported. Manufactured from A356-T6 aluminum. Assembled with 1.46" 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. Note: Will not work on '68-'71 340 engines using OE pistons - positive deck. Download Data here - DOWNLOAD