Was there any water in the oil?Was the oil milky?Like others asked was there any rust or discoloration around what you think is a crack?If you cant magnaflux it maybe see if there is another way to test it like with some dye. Putting sleeves in the deepfreeze overnight works.You still want to have a big block of oak or something to lay on top and hit with a hammer to get them all the way down in case one hangs.If you hit the sleeve with a hammer its a good chance it will break right where you hit it.I had to tap one down with an oak block and a hammer on my H and didnt have any trouble. You dont want anything between the sleeve and the block if you can keep from putting anything in there.Maybe if you arent sure about that crack you could put some JB weld over it,but you would have to sand most of the JB Weld off to get the sleeve in. Others might have a better idea for that.If its cracked it wont work very good and you might need a different block.Actually,if you cant check it any other way,you ought to pull the block out and take it to a machine shop and have them check for cracks.That way you will know when you are putting it together what you have.Overheating means you need to look very closely for stuff that might cause that. Was there an obvious blown out place in the head gasket?If not then was it low on water all the time?If there was no obvious blown place and it was boiling the water out,then you should be able to see if it was cracked. You could pour hot water into the block if nothing else and see if it leaks.After you block off any place the water can leak out then pour hot water in until its up as high as you can get it and see if it leaks.It shouldnt be too hard to get 2 or 3 gallons of hot water.If there is a way to get about 10 pounds of pressure on it with hot water in it,thats even better. You dont want to put anything on the liner because it wont transfer heat right.
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