Just to hit back on the blasting question, i'd recommend using a coarse media such as aluminum oxide or black magnum, which is dirt cheap. Stay away from silica sand, its bad bad stuff unless used properly. In your case you're doing engine componests which are probally either beefy cast aluminum or beefy cast iron, so a more coarse abrasive wont hurt it like it would a thinner sheet metal. I too do a lot of automotive parts and run 3 cabinets, one with walnut shell/plasti-grit for paint removal, one with glass bead/alum oxide mix for lighter more delicate things, and one with black magnum for heavy blasting on intake manifolds etc. Good luck and feel free to ask questions. We like helping!
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