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Clean the cooling system real well, and use some type of ceramic sealer as above suggested
or some type of glass sealer. I have seen some high temp epoxies used in exhaust port
That I never thought would work but they did. I Don’t remember what it was though.
If you could find some I’d use both.
When you try and braze in an area like that you can cause the crack to run further if the whole block is not heated and then cooled down properly.