"If the previous owner represe
"If the previous owner represented the boat as "lake ready", you may have some recourse. Saying that it's "Lake Ready" and selling it 'as is' can be two different things. He wouldn't need to offer a warranty but it shouldn't have any problems, either. You did run it or put it in the water before buying it, right? I would never buy something like this from a private owner without running it and taking it out on the water or doing a lot of checking out (compression, check all fluids, try every accessory or boat function).
I have heard of people grinding a small V along the center of the crack and filling it with Marine Tex. If it blew out a freeze plug AND cracked the block, I doubt that it'll end there. If the crack goes into the hole for the freeze plug, I'm not sure it'll be a long-term solution.
If you bought this boat recently, talk to a lawyer after negotiating with the seller. He told you it was lake ready and it clearly is not. He misrepresented the seaworthiness but after reading these posts, it doesn't sound like you did anything to avoid being in this position. A good marina would have done a complete survey for you and that would have avoided this whole situation.
Good luck with this."