I used a melling tensioner on my 5.9 magnum. Had about 1,000 miles on it when I tore it apart for a cam swap. The chain dug into the guides and sent bits of plastic through the engine. The crank journals were fine but the soft bearings were pretty trashed. I'll get pics when I get home later.
Like I said before, the tensioner was made for a silent chain, not a roller with its triple row of raised links. Your mileage may vary on if it chews the nylon. I cant really see how it does that unless its not oiled.
