360 Magnum Crack....head bolt to water jacket

Hang on a minute fellas...

What is the failure mode??? The coolant passage into a thread.... NOT INTO THE CYLINDER!!!!

There are many threads that go directly into the coolant passages; the front and rear studs for the exhaust manifolds on the heads go into the water passage with pressurized coolant, the long water pump bolts also go into the water jacket in the front of the block...

Just put some sealant on the threads for that hole, or run that silver powdered stop leak in the cooling system for 40 minutes and it will stop any leaks through the threads....

I don't think there is much to be concerned about....

Grind the thread repair off that's sticking above the deck and run it...