Description
Made from an AA 501 Series Casting, It is set up to build the performance Head of your needs. It Comes with Seats 44x37.5, Guides,with a 12mm plug hole.
The 501 Series Castings come STD with: Increasedmaterialat the intakesurfacegivingyou theabilityto make much bigger ports. 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 501
Valve Size: 44x37.5
Head CC: 55cc
Head Bore: 85.5
Plug Size: 12mm (ReplacementNGK Number is D8EA)