No holes. I pooled up degreaser in there and none bled through. Stopping any future corrosion but also sealing it from leaking incase it is so thin that it would have leaked in the future. Yes block rot is a fairly common issue on these engines. This is not a common fix as far as I know and I am sure I will catch some flack for doing it. Heat shouldn't be an issue as JB Weld is rated for over 500 degrees F.
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