Radiator outlet neck issue.

[drew43a]

So the radiator outlet neck that i believe is a original mopar part made of cast iron. It was straight sided  and seemed to be on the short side as far as length. But i put the hose and clamp on anyway.  During the break-in of the engine since it was rebuilt it was getting hot due to a bad fan clutch not working at all. we had just turn off the engine and POW!!! for a lack of a better word.
the radiator hose blew off and spewed anti-freeze out like Mt St Helen's. Covering my friends and myself and the car in a shower of anti-freeze. Yuck.  So  using files and a grinder and eventually my small lathe, this was a friends recommendation to solve the problem.

[Chryco Psycho]

Lucky you were not badly burned , I always have a hose close by to cool the radiator during break in runs

[drew43a]

we were actually not to close to the engine but we both got a good taste of it. 

[RUNCHARGER]

So making it thinner is going to seal the hose better? Did you check the wall thickness?

[anlauto]

Using a good quality gear clamp will do the trick. Hopefully you're not using those old style spring clamps, if you are you might want a new thermostat housing to insure the proper fit.

I received third degree burns on my lower leg and ankle once from the lower hose blowing off the rad....it's not fun removing your skin with your sock.

[drew43a]

Sheldon:  the hose was i tight fit before i turned in down.  But the key factor is having the rib at the top edge that the hose clamp can NOT slide past and off once tightened.

[usraptor]

Why not just buy a new neck?  They're not that expensive and then you don't have to worry about the hose leaking for blowing off.  While you're at it, if you haven't already, buy a new thermostat also and make sure it's installed correctly as being upside down will also cause your engine to overheat.    Good luck with whatever you decide. 

[Topcat]

Tony's sells the right reproductions.

Scroll down....

http://www.tonysparts.com/newproductsE.htm 

[Chryco Psycho]

Mancini Has billet Alum ones that seal far better than the factory ones do 

[drew43a]

My modification worked perfectly. and a new fan clutch,  we got the engine breaking period done with no issues.

[cudabob496]

So when breaking in, did you have a large box fan running in front of the radiator. Also, was engine coolant properly
vented. ie drill a small hole in thermostat.

[drew43a]

we left the thermostat out for the breakin period.