During this (sloooow) build/restoration, I've sandblasted a lot. I mean a lot, I've probably run through $150 in sandblasting sand over the past few years. Anyhow, I'm getting closer to the end (I see light at the end of the tunnel!), so I pull my SM465-SBC bellhousing off the shelf, and it's still nasty as hell. I remember soaking it for weeks in my parts washer and still it has caked on crud, taking it out and saying to myself I'll finish cleaning that thing later and putting it on the shelf. Is there any problems in sandblasting aluminum? I've done it before, on very small pieces that don't show anywhere, and not on anything critical. Am I going to damage this thing at all if I blast it?