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I was wondering if anyone could help me out with a diagnosis. I've got an 07 6.0 that I bought off of a friend relatively cheap, as it was going to need injectors soon and he just didn't want to deal with the truck anymore. Let me preface with saying that this truck had a lifter failure, and he...

Yeah those numbers sound normal. I would keep it in a lower tune setting if you could while towing and keep on truckin.

What rpms are you turning at 70? Those temps don't seem too crazy if that is when you are towing. Unloaded on a 200hp 10mm tune I am anywhere from 600-850*F at 75-80 mph. My truck as 3.55s as well, so that's around 1700-2000 rpms at those speeds.

When towing you would typically want a tune in the 80-100 hp range. Who's tunes do you currently have on the SCT?