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Re: Yukon knocking noise?
Get some GM E.O.S. assembly lube and dump it in. I've done it on several 3.4 v6 vans to get em to quit making noise. I'd try some additives first, but be warned they can damage other stuff if used incorrectly. You can buy a used 5.3 or less than $2200... It'd probably cost less to put a used engine in it than the cost of pulling the heads to replace a lifter. Last 5.3 I had with a cracked head it was cheaper to put a lower mile than the truck used 5.3 than it was to buy a new head/gaskets/added labor....
Josh
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