rear freeze plug leaking, mortal engine wound

340, the odd thing is that there is nothing wrong with the plug once I removed it(except for the screwdriver hole:))It was leaking between the plug and engine block. It was not rusted or thin. The engine only has about 4k on the rebuild which included new freeze plugs. I bought a brass plug and just finished putting that in. I'll see how that works. I also cleaned up the hole with 220 sandpaper. On the old one you could see the water stains all the way down the outside bottom edge causing the leak.