I did find a broken head stud (bottom-forward on #6), laying in the stud recess with the nut off!!! (I don't think the nut could have come off all by itself. Hm... Did someone put it back in there?)
Only one broken on #6. But the top-forwared stud on #6 was not up to the 24ft-lb spec, so I retightened it. I can't afford to rebuild the engine now.
I'm using a mahle oil filter, brand new, same as I always use.
If the oil pump is being starved, would it make a whining/squealing noise?
BTW, this saga sort of follows after by previous thread
Popping when on the gas under load .
Jim: Is the cam-tower to head stud nut one of the six 13mm regular hex nut on each side on the bottom?