1983 hydraulic engine

I didnt know really how to check the cylinders/pistons for broken/bad rings other than to disassemble/measure things which I dont want to get into on the bottom end.

I took the advice given to me and filled the cylinders with kerosine, waited, no drainage, the kerosine stayed within the top of the cylinder. Thats almost gotta mean no severe damage, that and inspecting each cylinder whilst turning over the engine every so often.

I took the opportunity of having the kerosine in the cylinders and cleaned everything up within reason. Vacuumed out all the loose particles from lifter galleys/cylinders and at this point I am hoping to be good to go with bottom half.

Someone had been into this thing before, permatex or some sort of gasket sealer on the head gasket.

Noticeable enough ridge at the top of the cylinder wall but I have felt worst. A couple of small areas at the top of the cylinders where I am guessing it sat for so long and condensation got into the cylinder causing a bit of rust/pitting but as far as I can see it is at the very top above compression ring.