I have a cracked block and am wondering what to do. I have highlighted the cracks. There is also a small crack between 2 of the sleeves. Only good news is the vertical crack is a hairline.  I leaning more every day towards making it a parts tractor. Other options are fix it right for hundreds of dollars which will melt the Babbitt out making even more expense, Nickel weld which is near impossible to make look good, Brass weld, or epoxy.  
I hate to give up on such a rare block but It may just not be worth fixing.
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