[jimTN]

Overflow "gagets" on non pressurized radiators IMHO is a must. This is because the water pumps push fluid thru at a fast rate and if there is the slightest restriction, fluid will go out the overflow. I have one of Skips overflow devices on my 32, 34 and a 29 Packard. Cured loss of fluid on all and temp stays where it should be. I will say that age and exposing to salt causes the fins to corrode around the tubes and lose conductivity. New cores are a good thing also. I also run thermostats in my cars.