in your case it looks like it's set up for heater hoses the connection on the thermostat housing appears to be above the thermostat, as for a bypass most of the time they are to prevent air locking of the pump or thermostat,Detroit had petcocks on the thermostat housing never had to open one until one night we blew a radiator pipe coupling hose on an 8V71 in a bus it had two separate radiators, two water pumps, one filler cap couldn't get it to take water on the closed side it would try to get hot idling, after myself and the field mechanic had ran out of things to try the man that hauled fuel for us walked by an opened one of the petcocks it swallowed the water and we were able to fill the system one of the pumps was air locked never had that before ,but the radiators were mounted above the engine one on each side
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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