Over heating on the freeway?

Cope said
Spring in lower radiator hose.

And with the plate in the T stat location I can check water flow at any RPM.

I know a prof. mech. that cured an overheating problem on a blown chevette by using a plate w/ a 1" hole in it. I experimented w/ hole size on a hot 406sbc, and wound up w/ a 5/8" hole in it.--jfyai