It's the cam , XE have fast ramps and the valves tend to slam shut.
I meant to write this very thing! Forgive me John, I'm starting to emulate your way of thinking! Summit warrantied the first cam when it went bad. After the second one crapped out, I felt that I was pushing my luck so I just let it slide. I slipped back in a cam referred as THE Dinosaur.... the Mopar Performance 292/509. In the time since, Comp began offering that hardening process for their product line. I agree that a Hydraulic roller cam would be a better choice in terms of reliability, but the cost is just too hard to take! I'd have to sell a few parts or scrap a few cars to feel okay about spending $1000 for a cam swap!
