I have used Belzona on a cracked block. It works well but as has been said it is expensive. I have also used a cast iron "stitching" firm who did a fantastic job.
One thing to remember about a frost crack like this is that the crack you can see will always be only half the story. Where the metal has been forced out there will be one or two corresponding cracks that you can't see... usually in parallel. These other cracks may or may not leak but will be there. Guaranteed.
For what it's worth I would source a better block.
One thing to remember about a frost crack like this is that the crack you can see will always be only half the story. Where the metal has been forced out there will be one or two corresponding cracks that you can't see... usually in parallel. These other cracks may or may not leak but will be there. Guaranteed.
For what it's worth I would source a better block.