SHOT BLASTING !!!....OEM Intake Manifolds

[CamarosRus]

I have no way to prove my thoughts..........but Im thinking that some/many/most old school OEM Winters Intake Manifolds
were shot blasted with metal media after casting.

I am not a fan of the cosmetic look when sand cast intakes are glass beaded.

Does anybody have experience or knowledge of: 1) Vibratory Tumbling (What Media) of OEM Sand Cast Intakes, Sand Cast Muncie Cases
2) Shot Blasting, Wheelabrator of Sand Cast Intakes and Trans Case

Thanks for your sharing your thoughts and suggestions