Reply to "Replaced radiator, now the engine is running hotter during stop and go driving"

I have two things for you to consider. First are the head gaskets good? My car would do this exact thing. The head gaskets weeped coolant out the back and you could see it. Because the coolant system would not hold pressure steam pockets developed and the car would boil over. Going down the road it was okay but if it was hot outside and if I got caught in traffic the temp would climb.

Next have you checked your timing? What is your initial and total timing set to? Are you using vacuum advance? If so is connected to ported or manifold pressure?

At this point with all that I have read on your situation and having gone through this myself I'm guessing head gaskets.

Steve