My 340 is running hot I think.. I need a sanity check.

nm9stheham said
As said, your coolant level will not stay any higher than 1" or 1-1/4" below the top of the tank in the radiator (not below the top of the cap neck). If you over fill it, it will blow off coolant 'til it has enough air space for expansion. So let it blow off and see where it settles to.

Where is your 2nd temp sensor for the Stewart Warner gauge installed on the engine? The reading sounds pretty good if the stock gauge is midway.

FWIW, the heater hose connections are backwards at the firewall compared to a '65 Cuda....if that is the same as your later model.

And BTW, you ought to drain all your coolant and get rid of that tap water. If it is softened water, that may OK. But regular tap water typically has minerals that will cause considerable deposits and contribute to block and head corrosion (in the case with a brass rad). Distilled water should be use.

Clarification, my fluid level is from the top of the tank not from the neck. See pic. Sorry for the confusion.

The sensors are an inch apart SW on the right factory on the left. In pic.

Dang you all are right about the heater hoses. I double checked the manual and this is why I need a sanity check. See pic. I'll swap them to ensure the are correct. Can that really be the root cause??