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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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