So I air pressure tested the block by plugging the thermostat housing outlet and pressuring the water inlet to 20 psi. It held rock solid. I put 4 fresh quarts in her and took it out in the lake for an hour. Oil is pristine. I really think it was just condensation from the PO not running it long enough to cook off any moisture. A week of worry for nothing. Lesson learned.
Last edited by Banjo5; 04-11-2021 at 12:11 PM.
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