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Was the lifters and rockers replaced? If not you will need to pull the valve cover again and inspect all the rocker arms as well as the lifters, and if you had a bad lifter it will eat the camshaft up too so you will need to check things over again..
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How about the lifters/tappets? I have repaired many of these and we are having issues with the 3.6 head and misfires. You will need to recheck the lifters/tappets, rockers and see if the camshaft has been chewed up. Are you doing the work or is it warranty?
You will need to pull the valvecover to inspect and if our 100% sure the noise is coming from there don't put the valvecover back on until you find the issue..
If your 100% sure the noise is under the valvecover then I would not put it back together until you find the issue. I can't inspect it over chat so you will need to recheck everything.
Yes it can still tick and not set a code but if it's not repaired it will eventually cause a check engine light.