I performed this repair this summer (7-25-02) -so far so good.
"OK I fixed it! I used JBWeld. Not a very glamorous repair but very well done.
The neck broke off in two half pieces. I glued them together with JBWeld and let them harden. I then took this assembly and glued it on to the plastic radiator neck where they came off originally.
I made sure the surfaces were VERY clean. I put JBWeld on the mating surfaces and extra both inside and outside all along where the break was.
I let these dry for about 15 hours. I attached the hose, drove through 100 degree weather with the AC on going up 6% grades. The coolant temp got up to 100 C. I feel this was a great stress test.
The repair doesn't leak and seems as hard as a rock."