Where Does Oil Where Block Bolts on Come From?

Dennis Terdy

"Oil in ledge under engine side plates (10 bolts each side)"

I have not seen a Crosley yet without oil pooled in the ledge beneath the side plates (ones covering cylinders on both sides) of CIBA engine. I have tightened the oil pressure connection to the block on both of my Crosleys - still leaking. What is the source? Please advise. Thank you.

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