When I brought my chassis home to restore, I decided to exchange the water pump for a correct casting. This pump has been challenging to identify due to the lack of raised numbers and non flaired heater attachments which I would discount as aftermarket. It is however a heavy casting with a raised circular area on the passengers side and a cast closed back impeller. What is the consensus from the numbers experts? Thanks for your valuable insight.

 

Another pic

 

And the impeller

 

A good version of an aftermarket unit.

Most critical fitment measurements are the height or distance from gasket surface to pulley mount surface, and inlet nipple outside diameter.

With those two figures, one can ascertain if it will work on their engine/ pulley/ hose set.

There are three different lenghts, approximately
5.1, 5.6, or 6.1" or for you Euopeans,
5,1 5,6 or 6,1 inches. :-)

Put a straightedge on the pulley flange and measure to gasket surface. 0.1" is about 1/8" as I am sure everyone knows. A tenth is about the same as an eighth when measuring by eyeballing a tape measure. If you have calipers, all the better, use that tool.

Inlet OD might be 1-3/4 or 2".