That rod bearing is ugly. Likely the cause of the knock. Doesn't take much out of spec for a rod bearing to make a hell of a noise.. Hope that clears it up for you and glad you didn't ventilate the block.
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Retired US Army 82nd Airborne Division.
- There's no such thing as a perfectly good aircraft. I have the option to get out while you have the pleasure of riding it in.
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