OK it is  vapor or steam pocket at the highest point in the system not
an air pocket. I stand corrected.
Imagine what would happen if it were plugs up.
Here is some work Continental did.

Paul Lamar

Monty Roberts wrote:

Paul,

That is a great article on the Continental engine. It went in the keeper
folder. I have had some deposit problems like they described in the past,
but it turned out to be due to electrolysis. If you don't adequately ground
your engine and radiator, you can get ground loops through the coolant which
gradually "plate" some of the components with sludge. This is a problem on
modern electronic engines, especially if you have an electric fan which is
not grounded properly.

Monty

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