Running Hot on the Highway

I now have a new Milodon 180 high flow thermostat in there and a new reproduction 16 pound cap I got from Mega Parts. The hoses are pumped up hard when the engine is hot. Engine hot I watched the hoses with revs at highway speeds and nothing is collapsing. The engine seems to really like the extra heat of the 180 thermostat. It really runs a lot better then before. I think those aluminum heads like heat. Have not had time to take it on the highway yet but it hauls *** on the back roads.

I ordered one of these today:

http://www.amazon.com/Mastercool-522...pr_product_top

I am going to measure things with the infrared gun when it gets in and see what the temperature is of the hoses, intake manifold, thermostat housing, radiator etc. Then I will have a better idea what is really going on.
Glad you,ve found your problem.After installing my engine/tranny and all the other goodies that go with 6/360 conv. in a 66 Dart,I found out there,s a pin hole in driverside head and ofcourse it,s in the rear.Good Luck and keep it cool!