It wasn't very long. I can't remember right off hand but I think it was 6 or 7 months.
I don't know the noise Brian is talking about... I didn't hear anything unusual. I have PAC beehive springs so I they might help keep down the vibes and noises. Just guessing on that.
Last question, are you still running the melling lifters, and how are they holding up if they are still in the truck. I had contacted Richard awhile back, so he is on my radar as well as an option.