Ford Performance M-6049-Z304D Cylinder Head

Aluminum - For Use w/302/351W - Bare - 63cc CNC Combustion Chamber - 1 pc. Designed Using Solid Modeling Technology Cast From Prime A356 T6 Aluminum Heads are Cast w/High-Flow Ports 20 Degree Inline Valves Required Competition Valve Job and Bowl Belding Steel Alloy Intake/Exhaust Vale Seats Installed Manganese-Bronze Valve Guides Installed w/Semi-Finished ID 63cc CNCd Combustion Chamber 85cc Exhaust Port Volume As Cast Raised Exhaust Port Exit; Custom Headers May Be Required Made in the USA Product Documents: Installation Instructions Ford Performance Parts - Cylinder Head P/N M-6049-Z304D: Cast from prime A356 T6 aluminum, these "Z" heads from Ford Racing were designed using solid modeling technology. They feature high-flow ports and steel alloy intake and exhaust valve seats installed (they do require a competition valve job and bowl blending). The manganese-bronze valve guides are installed with a semi-finished I.D. and the combustion chambers are CNC-machined. Laser-cut guideplates are included, and they accept both tapered seat and gasket-style 14mm spark plugs.