Hi:
It's most likely a rod bearing, main bearing, cam bearing. Something was starved for oil and has been damaged. Because I'm not there to hear it, I recommend you allow a mechanic listen to it. He / she will most likely be able to give you an idea of what bearing it is based on it's sound.
If you have any other questions, let me know.
JOe
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Friday, October 17th, 2008 AT 8:54 PM