JonnyK
The flashing in these things can be loose, one of my friends scored a cylinder wall when a loose flake of this about 1/4" in diameter and razor thin dropped into one of the cylinders. It ended up in the valve relief of the piston. So if you buy one, inspect it thouroughly. He inspected the intake and found a couple other spots where rubbing it with a finger could dislodge a piece that was razor thin and about the size of a dime. The intake was replaced by the company but he was out for a shortblock.
This is not the same as the bumpy surface left by the casting process, found in all unported manifolds.
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