"Honestly I think the cam goes bad because a roller quits rolling and starts sliding"

The 2015 6.4 I picked up last week suffered from this, the roller on Intake No4 was stuck , wiped the cam lobe.


"How does the stock 5.7 tune do with a 6.4 cam? I've heard that a tune isn't necessary but really wakes them up if you get one. Noticeable power increase with a 6.4 cam?"


Wondering that myself.