Gordon Maney's 1948 B1PW lives on.....

[Andydodgegeek]

I removed the oil pan to clean out the sludge from years of sitting and noticed a drop of green on a main cap bolt. I cleaned everything off really good and then pressurized the cooling system. I sat and stared at the block and watched as coolant appeared in a hairline crack. Kind of in a webbing between the cylinder and the camshaft.

[Tom Petroff]

Not Good.
As soon as you can get away from freezing temps I would run straight water until you find a engine.
Don't think I would attempt a repair.

I would get some KD block and Head seal and run that and hope for the best.
Barr's leak would be my second choice.
Stay away from alumni seal or other stop leak as they tend to clog the system.
Actually a lot of OEM cars leave the factory with a small amount of Barr's leak installed.

Anti-freeze in the engine oil will lock up the motor once enough has accumulated on the bearings and Cyl. walls.
TGP