[demarpaint]

Sorry.

I wonder if they only replaced the lifters and not other worn parts. Causing the good lifters to go bad again.
Kinda strange its making noise so quick after you fixed. Wonder if they even replaced them or just through some MMO in the crank and called it a day ??

Hope all turns out well

Yep I learned that the hard day back in the 70's. Changed all the lifters in a 302 Mustang, and guess what? I still had the noise. Anytime I change lifters I change the cam now as a result of that lesson. Changing noisy/bad lifters w/o replacing the cam is asking for trouble.

 

[demarpaint]

I would think this is the most likely cause. There have been incidents where Mexico assembled engine blocks weren't thoroughly cleaned which have caused problems. Take a look at your window sticker which will indicate where your engine and trans was assembled. Not 100%, but maybe an indicator.

+1
It could be one of the Mexican engines. Now that they replaced lifters and tossed a bunch of $$$ at it they might learn. When you change lifters change the cam. I hope the OP gets an engine out of the deal now.