Description
Made from an AA 502 Series Casting, It is set up to build the performance Head of your needs. It comes with Seats 40×35.5, Guides, with a 12mm plug hole.
The 502 Series comes with our Stage 2 porting with a modernized combustion chamber for increased head flow & performance. There is 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 502
Head Bore: 85.5
Plug Size: 12mm (Replacement NGK Number is D8EA)
Head CC’s:55
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