Shop foreman took me to meet with a guy working in the back. I'd guess he was around 70. Shop foreman says this guy needs to see if we can sleeve his engine. Has a crack in it. He never said the word hole, or drilled. I said actually it's a couple of holes I drilled in it. Man looks at me and says "frost plug was giving you trouble, huh"? Smiles and says "seen that a few times before".
We went out and looked at my block. He looks it over good, I spin it over so he can see how far down the piston goes. "We can fix it", he says. Goes over the whole process. I asked him what to do with the holes after the sleeve is in. "Nothing", he says. Says the liner will fit so well, I would really have to overheat it to get any antifreeze past it. As for the Antifreeze hurting the liner, he said unless your PH is way off, it won't hurt the liner. It's made of the same thing as the rest of the block. I mentioned possibly putting permatex in the holes from the frost plug hole and he said it wouldn't hurt, but not necessary.
Says unless you have a crack from top to bottom, they can usually sleeve a cylinder.