[Barnsnake]

Ed,
I was referring to the picture that Voyager included in post #29.

Ernie,
The Cleveland has the thermostat and the bypass in the cylinder block. In the "Clevor" setups they move the thermostat and bypass back to the front of the intake manifold like a Windsor.

The elimination of the bypass does increase the maximum efficiency of the cooling system, but in situations where the thermostat is closed a significant percentage of the time, it will cause the temperature to "yo-yo".

Voyager,
The two 3/32" holes in the thermostat will allow some minimal circulation and may reduce, if not eliminate the problem. Bear in mind there are a few million Windsor-style engines running out there, virtually all with the circulation bypass. Keep it in mind.