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Re: What's going wrong inside my 350?
The sound definitely gets louder as you moved the cam towards the front and based on what your mechanic said about isolating it to under the timing cover, I would be pulling that water pump and balance and removing that timing cover for a look see. If nothing was apparent I'd be dropping the oil pan in no uncertain terms. I wouldn't run it unnecessarily anymore as you will make a bad situation worse.
Thats metal on metal and that isn't a good sound on an ICE...
Get your wrenches out and start checking.
Good luck
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