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

Stock HeadWith seatsand guides 35.5mm Intake 32mm Exhaust, with a 14mm long reach plug Made from an AA 500 Series Casting itcomes 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: 35.5x32 Head Bore: 85.5 Plug Size: 14mm (Replacement Bosch Number is W8CCor NGKis B5ES.)