Valve train should not be that noisy. Even if they were solid lifters, which are noisy when cold and quiet down when at temp. Something is rotten in Demark. I has heard a few MBZ with the AMG treatment and even at full honk, I have never heard a noisy valve train.
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.