Was this a special build radiator?
What is the part number on the radiator...?
I have two CC 369 rads here in projects and both accepted the Earls fittings....snug and no leaks...
Beginning to believe this radiator is not marked correctly...
Do you have a good hardware store near you ?
Go buy yourself a 1/2" 20 TPI bolt...it should screw directly into the radiator bung...
If its as loose as the fitting is... send the radiator back to the seller and find another source...
Not a plug...but old jeggy always looks after me
https://www.jegs.com/i/Champion-Cool...CC369/10002/-1
Have them send you the fittings as well....
