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Fill up the radiator and install a pressure tester. If it's leaking that bad you should see it squirting out. Pay close attention to the intake manifold area, cylinder head gaskets, freeze plugs and the heater hoses. Make sure it is not leaking out of the A/C drain, that would suggest...

I have a 318 5.2L... it looks like its running down from the top of the bell-housing. Can I pressurize the system even though it won't hold any coolant?

Problem is it won't hold water, I pour it in and within 30 seconds its leaking down the bell-housing. That tells me its not pressure pushing it out. Just got thru changing the heater core. I had my wife pour water in the rad and I checked all the gaskets, hoses and crawled underneath to check the...

Well if it is leaking that fast it sounds like a blown freeze plug. For the ones on the side you may have to remove the engine mount or starter. For the ones on the back you will have to remove the transmission.

My truck recently overheated and while adding coolant I found it leaking near the bell-housing. I have checked the freeze plugs, hoses and gaskets for possible leak source and cannot find anything. Would appreciate any advice you guys have to offer... hoping it's not a cracked block.

Which engine does your truck have? Is it leaking on top of the bell-housing or out of the bottom? I would pressurize the cooling system with a pressure tester, does it leak more when the engine is cold or when it reaches operating temperature?