I hope you are not using the synthetic oil . I doubt the rings have had time to take a seat .
Mine is supposed to have 44K on it but I will hold off on saying if that is accurate until I have a peek inside . I can turn it over with a wrench - That happened when I was taking off the flywheel . I was thinking it should be tougher to turn over . I am not sure what the compression is like . I will not know until the truck has passed inspection and is insured.
The engine does not burn blue and smokes only when i screw up on a shift .
175K is not a lot of miles for a 4B by any means. 500K maybe. You'll go through a rebuild of the injection pump before the anything in the block wears out, IMHO.
I can't tell you how many miles were on my 4B when I bought it. The only PM I did was have the injectors rebuilt after I did my repower.
Mine probably has 200k on it and it still runs good, I recently had an issue with the I/P and getting loads of diesel in the motor oil, therefore low oil pressure; as long as that didn't mess anything up I have faith in it for another 100k...