HotRodDave I may have misspoken on double roller chain now that I research more. My mind is stuffed with various engines and info. My apology.

Mike I agree failure rate seems to be equal on MDS/non MDS. This particular car I'm working on is a pursuit with 153,000 miles and tons (I forgot the exact right now) of idle and engine hours so I have nothing bad to say about it. I'm just theorizing that maybe the dealership never did the tensioner despite the paperwork. Engine as gotten quieter and I hear the clack far less often since oil change. Doubt it's permanent so still researching and planning lifter/cam and we'll see what else when I'm in there. Looks like Comp Cams part #15820=16 or OEM Hellcat Lifters is the way to go for lifters.

Very interesting video!

https://www.youtube.com/watch?v=9B2jKRoCvOU


Facts are stubborn things.