When you say rocks in a can... do you mean it sounds like pinging or rod-knock.
Has he redlined the engine at all? (leads to spun bearing)
Did you drain the engine oil to see if it is milky? (blown head gasket)
I had this happen on a chevy engine when I spun bearing.
I over-revved the engine 3 times before this happened.
Hope this helps. - Better yet, I hope I am dead wrong.
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Steve K.
98 GT w/ 3.73
Your car is fast, are you?
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