5 axis CNC ported to increase flow and performance
48 cc combustion chamber (Stock head is 51 cc)
Increased size 35.0 mm intake valves (Stock intake valve is 34 mm)
Increased size inconel 38.5 mm exhaust valves (Stock exhaust valve is 37.5 mm)
Intake runner volume: 214cc (Stock 174cc)
Exhaust runner volume: 73cc (Stock 62cc)
Intake flow rate at .600 lift: 291 CFM
Exhaust flow rate at .600 lift: 191 CFM (no pipe)
Fully assembled with bronze guides, light-weight steel retainers,upgraded valve springs
Includes Ford 4.6L 3-Valve Cam Phaser Limiter Kit
Does not include camshaft, followers and hydraulic lash adjusters
Use head changing kit M-6067-3V46.
Requires 2008-2010 12mm spark plugs
Heads will fit early cars originally equipped with "High Thread" design spark plugs. Requires spark plug and ignition coil update.
NOTE: Engines with late style 12mm spark plugs can be identified by coil engineering number 8L3E. Engines with early style 16mm "High Thread" design spark plugs can be identified by coil engineering 3L3E part number.