Hi, I just acquired my grandfather's 1949 F-6 with the straight six. I believe it is a 254. Anyway, it has a cracked block and the antifreeze is mixing with the oil. Anyone have any ideas where this might be mixing or anyone have any ideas where I can find a 254 block

 

Are you sure the block is cracked and it's not just a head gasket?

If it is the block, and it's not cracked at a freeze plug, you could probably have it repaired!

 

I'm sure it's not the head or gasket. That was my initial thought but I looked around. I put a pressurizer on the radiator and watched antifreeze pour through a zig zag crack in the bottom of the block. It's not near any of the freeze plugs, though. What does a repair like this cost, if you know?