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I purchased a 1983 f100 4.9 from a friend about a month ago and have now started fixing the truck little by little. I purchase the water pump and thermostat hosing. but it seems to have a bypass pipe that is tied to the emissions or some type of sensor (see picture)
That would be a hose nipple that screws into the housing.
Now if you cant find a hose nipple just get a short threaded pipe from the hardware store that will screw into the housing and the hose slips over.
Now there are 2 different housings with different size threads for that hose nipple.
The one I got at Auto Zone was too small and the nipple would not screw in.
I was told O'Reilly's auto parts had the right one and sure enough they did.
Dave ----
