What do you think guys? Finally found the leak. Get enough water in the radiator and it really pours out of there. You can just see a bead of water in the photo. Where the head and square thermostat manifold housing meet. I suppose this housing is a cast part of the block? And it's leaking from the head gasket? If so.. it's a pretty big leak.

 

Interesting. I don't think I've seen anyone report external HG leaks.

 

is the passage to the left of cylinder number 2 at the far left of this photograph.. for coolant? or exhaust? If that is a coolant Passage.. that is very close to where the leak is coming from.