Coolant overflow capacity?

I run two of these. The silver one is about 24 oz on the slant and came from Champion with the radiator. The other is on the wagon with a 318, it holds about a quart and came from Amazon. I filled up each radiator to just over the inner ribs, then drove them. There was a couple of inches in the tank when parked, and less once the system cooled off to suck the excess back into the system. I only added these as my local track requires something to catch overflow and while I'm not a racer I did want to take a few runs once in a while.

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