What would cause the very noisy lifters in my 5.4 with approx 63,000 miles

 

How about if you elaborate more on your question and give us exact details about this noise problem you're having. Then maybe, we can assist you better in determining where the problem exist, what caused the problem, how you can fix it, and when you would expect to have the problem again.

 

If your talking about why it sounds like a really calm diesel, its because of a bad cam phaser, you can replace it but it will in time wear out again. Just live with it.