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 - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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