It could be the chain. There could be a failing tensioner. The best thing to do is purchase an automotive stethoscope and place it on the timing chain cover to see if that is where the sound is coming from.
Also, if it is loud enough, record it and upload it for me to hear. I may be able to recognize it.
When they replaced the chain, were any other components replaced at the same time? I attached an exploded view of the timing chain and components. Take a look.
Let me know.
Image (Click to make bigger)
Thursday, May 4th, 2023 AT 8:24 PM