Description
AA 500 Series CastingWith seatsand guides40mm Intake 35.5mm Exhaust, It is set up to build the performance Head of your needs.
The 500Series Castings come STD with: Cleanflowingcooling vanes, formaximumcooling through the head, and around the intake ports forincreasedHP and over all cooling. Amodernized Combustionchamber, for increased head flow & performance. AsecondFull Fin, soyoucanFlycutyourheads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O-ring and stoppossibleoil leaks. Long reach 3/4 Inch SparkPlugs, toreduce the chance of cracking betweenthe Valve seat and Plug.
Casting: AA 500
Valve Size: N/A
Head Bore: 85.5
Plug Size: 12mm (ReplacementNGK Number is D8EA)