URGENT!! Crack on block

I found a method to totally fix a water jacket crack. Not same as this problem but wanted to get it out for your info. I had a 3 corner crack in water jacket on 350 boat motor. A guy used a method called stitching. It can be done on anything. I had to tear down the block but he charged only $100. Pressure tested at twice the normal pressure and held for several years, I sold the boat and it was still good. A new marine short block was around $2000 so it was terrific deal.