Thanks again for the update.
Sense were not using any coolant
we don't have any fuel getting pumped into the radiator,
so we know the head is ok,
if there was still some contamination in the block this would be cleared up by now.
the low oil presser will come back in time i think with the crank case making h2o and possible co in the crank case
Here is my experience with this problom
i asked about pitting in the bearing surfaces this says h20 has been in the crank case for a while
a oil sample test right now will tell you what is going on in the crankcase
we can have a problom with
the spacer plate between the head and block there is a bunch of o rings between this and the block a cracked o ring on between the spacer plate and cylinder jug will let burnt compressed gases into the crank case this will cause h20 watter in the crank case
also a cracked o ring on the top of the cylinder jug between the jug and block will do this too
and then there is pitting of a cylinder jug not enough to let antifreeze into the combustion chamber but let the compressed burnt gases into the crank case and doing what your experiencing,
if you pull the oil fill cap and hold your hand over the filler tube and it is pushing your hand away
i would pull the head and spacer plate and push out all of the cylinder packs
you can have just one of these problems or all described.
Let me know if i can help more!