Turning torque for engine
@Slappy told us in the 1st post that he has checked all cooling system stuff, but I agree with all the posts here, there's still something going on.
I think an engine would kill itself before any hard-to-turn issues caused overheating.
Be happy, Slappy, (See what I did there?) engine issues are a much bigger problem than cooling system issues, of course. (Unless it's Hard-Blok, or something like that.)
Is there a thread you could link that shows us what you've tried?