Well…. I just picked up a cheap 2010 SRT8 6.1 with a bad Hemi tick……. Got the heads off and cyl 5 exhaust lifter was toast….. it dug a groove into the cam lobe and was just starting to hit the bottom of the lifter body outer supports……. AND…. Cyl 5 intake lifter was about to fail….. roller had a huge amount of play but was still spinning……. I have read that 90% or more of lifter failures were from cylinder #5……. I’m putting in a nice cam upgrade/springs with the new hellcat lifters and the Melling 10342HV oil pump……. TBF