What"s the cost to repair severe internal engine damage to a 2003 Toyota Tacoma.

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I was attempting to change my timing belt myself, but couldn't get my engine to manually turn clockwise, so I tried turning it counter clockwise without knowing it's not suppose to rotate in that direction. It would only move about an inch in either direction so I put the timing marks back where they were when I started and put everything back together without even replacing the timing belt. I tried starting it shortly after only to hear a slight ping from the engine. Now I'm just worried I done something that can't be fixed easily. Please help!