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ON my Kent engine the stat is an on off valve like your hose bib on the side of your house. Open or closed.
A bypass stat is more like a switch in a train track. When the engine is cold the water is run from the pump back to the head and through the block. As it gets warm the switch gradually opens and diverts the water to the radiator. Once fully hot the stat may divert all of the water to the rad.
The purpose is to keep the engine parts all the same temp with no hot spots.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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