Valvetrain Geometry

Newbomb Turk said

I thought the compressive forces of drawing (or pushing I forget how it’s done…maybe it’s both ways) the bar stock through successive dies changed the grain structure or probably more correctly lets the grain flow bend and shape around the part, making it stronger than if rocker or whatever part was machined from a round or whatever shape of materiel you start with rather than just machining it.

Do I have that correct?

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Lot of good info in this post.

You do have it correct, to a point. There is a skin effect when you push/draw the material through the die, with compression of material on the outside. But since the billet material goes though the same process, I don't' think there is a significant benefit for the drawn rocker, unless the center hole is drawn as well, which i doubt it is. I could be wrong. I just in general have a disdain for the whole "billet" part description because it infers superior strength that isn't present. Forged aluminum on the other hand is a whole different animal. Much stronger, and much more expensive.