Description
AA 501 Series Casting, It is set up to build the performance Head of your needs. It Comes bare with a 12mm plug hole, and with out Seats or Guides. Giving you the the ability to build any possible combo Street/Drag head you want. Seat Pockets start with the Stock 35.5×32 valve size Configuration and can be machined up to the 44×37.5mm
The 501 Series Castings come STD with: Increased material at the intake surface giving you the ability to make much bigger ports. 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 Spark Plugs, to reduce the chance of cracking between the Valve seat and Plug.
Casting: AA 501
Valve Size: N/A
Head Bore: 85.5
Plug Size: 12mm (ReplacementNGK Number is D8EA)
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