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i’ve tried to track it down it sounds like it’s on the passenger side lower part of the engine
Check the end bolt on the exhaust manifold, very common to find this bolt broken off on the 4.8 and 5.3. I repaired it the hard way by taking the head off and drilling the bolt out, BUT there is a clamp on the market that bolts to the back of the block and uses a third bolt to compress the exhaust manifold.
 
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