The hot water exits the intake and flows through the heater core and on to the INLET side of the waterpump.
The port the heater returns to is in a common area to the big hose barb on the pump that connects to the lower radiator hose.
Hot water exits upwards from the front of the heads, into the intake manifold, flows though an area in the intake manifold that heats the fuel mixture, then exits upwards at the back of the intake through the clever pot metal quick connector into the heater hose.
Have you checked the quick connector? There's a rubber washer flow restrictor in the connector that can clog or get deformed/crushed nearly closed when the pot metal fitting corrodes and deforms.
Older engines with "V" belts used CW waterpumps, serpentine systems the drive the pump off of the flat back of the belt run CCW.
The vanes on the impellers have the opposite slant between the two pump rotations.
If you got the correct part number for the year/model it SHOULD be correct!
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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