I know this is an older thread but I recently got a good deal on a 2010 6.1 with the Hemi tick…. #5 cyl was the culprit with BOTH lifters bad…. I believe the exhaust(3rd from the back?) was toast with the roller flat spotted and the plunger retainer had popped out? The other lifter was still barely operational as it had a ton of play in the needle bearings and the roller had a ton of clearance….. all the rest of the lifters were like new. Engine was just recently rebuilt I was told and I believe it as it’s super clean and no hardly any carbon deposits….. cyl #5 was super clean……. I’m putting in a Comp 220/230 HRT cam/springs and I’m going to measure exact pushrod length and get custom pushrods for extra insurance against failure……. And of course I have new hellcat lifters going in……. I know this info is old but it may help someone…….