Motor issues.
Where I live at 4600' 160-180# is real good.
160 is good, and 180 is real good but;
If you are saying that yours fall between those number,
then the range is NOT good.
Yes I know it falls into the factory acceptable range, but that don't mean much(squat) in the real world.
If it was mine, I'd be running a LeakDown Test, and I'd probably end up pulling the heads, cuz I have never had an engine with a variance that big, and that there wasn't something wrong with it.
