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If the block is no longer available or super-expensive you could gouge the cracks out and nickel weld them with a stick welder. That's what I would do.
Or JB Weld it and cross your fingers.
If you can get a new block then you should go that route, assuming you want longevity.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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