Thermal Cleaning...Check it out.

Sure.
First the part goes into a thermal oven. Each oven features a main burner that will bake and
carbonize any grease,oil, paint, debris, or dirt on the work piece.Basically turning everything in to ash.

After baking, the parts are transfered to a blasting cabinet. The part is blasted using a special media (stainless steel pellets in my case). Both cabinets turn the part like a chicken on a rotiseree.

And thats basically it.
Cost me $50. But now I have a close to new 340 intake. :)

Be careful when trying to use this for blocks. I've got a friend who had this done on a 440 block and ended up with a ruined crank and bearings because of the stainless shot left in the oil passages.