[Spridgets] Radiator question.

[DAVID GROPPER]

Looking at my '65 Sprite...
The temp sensor is plugged into the head. 
There is also a blanking plug in the radiator where they used to go.
I've tried researching in my books but can't seem to find the answer to this question.
Why the change from the radiator to the head??

 I would have thought less vibrational stress on the capillary from using the radiator position.
Is there that much difference in temp measurement over that 12" difference in the water flow?

Dave G.