the tensioner came about for the chain harmonics seen on the 3.9l V6, which is essentially 3/4 of a 318. Nothing else, which ought not be an issue on the v8's, especially when you consider that Mopar didn't put them on the v8's of the same time frame. [/quote]

Ok, maybe not the same time frame, but today most if not all modern engines utilize them. I realize mopar v8s have MDS, and perhaps chrysler engineers thought it would be a good additional benefit, or maybe there's more?

And refresh my memory a second, did magnum v8s use tensioners?