[Bill Hanlon]

Something doesn't make sense here Nathaniel. I've isolated 4 statements from you below.

Originally Posted by Nathaniel1234

Installed a water temp gauge and saw was pushing 210 degrees

Originally Posted by Nathaniel1234

There is a female thread in that custom piping which housed the factory 1955 water temp gauge sensor, I just threaded in a autometer sensor in exact same place.

Originally Posted by Nathaniel1234

I felt the radiator and it was not even hot! Upper radiator hose was not even hot.

Originally Posted by Nathaniel1234

I replaced the thermostat with a new 180 degree unit And new 13 lb radiator cap- did not help.

If the temp sensor which is just downstream from the thermostat is seeing 210 degrees and
If the thermostat is working and
If the upper hose is cold and
If the coolant is flowing through the upper hose
... the where is the heat going?

By the way, I assume the autometer sensor is feeding an autometer temp gauge. If it is feeding the 55 Pontiac gauge it is most likely reading wrong.