This is a brand new big valve cylinder head. The Head comes with stainless steel intake and exhaust valves, hardened keepers, chromoly retainers, and single or dual high rev springs. It is ready to install.
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. This increases 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) 14mm spark plugs to reduce the chance of cracking between the Valve seat and plug.
Casting: AA Performance 500
Plug Size: 14mm (Replacement Bosch Number is W8CC or NGK is B5ES.)
Single High Rev
Dual High Rev
Valves Sizes Available:
Bore Sizes Available:
85.5, works with 85.5,87, and 88 slip in kits
92, works with 88 thick wall, 90.5 and 92mm kits
94, works with 92 thick walls K and M, and 94mm kits