This is the underneath of the head the circle things on the second cylinder look darker than the others and on top of cylinder three one of the holes is gunked up. Haven’t found any cracks yet but I think I am just going to take the head to a machine shop and get it magnafluxed to verify. however it is a couple weeks lead time on that test. I sprayed the open part on the inside down with degreaser wiped it off and coated it with fogging oil. Anything else I should do to avoid rust?Flip the head over. And see if the valves are all closed.
I Can see a little black, which is carbon from your exhaust between 2 and 3 3 and 4. It might be there, but I would think those other cylinders would low on compression. Try to wiggle the piston in the bore.