Dual Port Head with seats and guides 35.5mm Intake 32mm Exhaust

Description: Stock Head With seats and guides 35.5mm Intake 32mm Exhaust, with a 14mm long reach plug Made from an AA 500 Series Casting it comes STD with: Clean flowing cooling vanes, for maximum cooling through the head, and around the intake ports for increased HP and over all cooling. A modernized Combustion chamber, for increased head flow & performance. A second Full Fin, so you can Fly cut your heads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stop possible oil leaks. Long reach 3/4 Inch Spark Plugs, to reduce the chance of cracking between the Valve seat and Plug Casting: AA 500 Valve Size: 35.5x32 Head Bore: 85.5 Plug Size: 14mm (Replacement Bosch Number is W8CC or NGK is B5ES.)