VCCA Home Forums TECHNICAL - GENERAL Trucks and Vans '49 Chevy 216 Water Pump Question

Need some historical information regarding the types of water pumps that were used on the '49 Chevy 216 engine. I have 4 H2O pumps, all are said to be for the 216 engine. Some have very different casting information. 1st one is PH-43 with a narrow pulley, 2nd is GRAPHO with wide pulley and hole in pulley for access to a lube point, 3rd and 4th are wide type with similar casting numbers 839403 GM22, and 839403 GM8. Master Parts Catalog does not show any of these numbers. 839403 parts seem to be closest match to master parts catalog but all look like they would work, except PH-43 with narrow pulley. What pump would be the most technically correct for my '49 Chevy truck?

The GENUINE Chevrolet water pump for a 1941-54 Chevrolet will have the casting number 839403 on the body.
The pump will have 2 large holes on the back plate to match up with the block. If the pump was assembled (as a replacement part) after 1953 it will also have a small third hole low on the plate. The hole matched up with the 1953 block and is a by-pass hole. Its just ignored on the earlier models.
The pully will be for the wide belt. If it has a narrow belt the pump is for a 1953-54 car or small truck (truck was a 216, car a 235).
The pump with the PH-43 would be for a 1953-54 and a replacemnt brand, Grapho is some morfidite and would not use it.

Thanks Chev Nut. That totally answers my question.