This was water jet cut from a chunk of alum. Amazing what a stream of H20 can do. It's called "Adamization" after the fabricator.
I don't consider this a "billet" piece, it's a aluminum component that provides a function not covered by any other sourse. BILLET, as refered to in an automotive sense, is an aluminum piece made from aluminum just for the sake of replacing a mundane component for the WOW factor. Has anyone ever refered to a fully machined piston as a billet piece? I think not!! Frank