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Can you please tell me what this water pump is originally from? It was on my 69 L46 that we bought in 1978. Its a short pump, has a square plug in the top with a "G" stamped on it, has GM19 cast into it in front, part number 3839175, has a heater hose outlet on it, and a dual bolt pattern for the fan clutch. Can you also tell me what date this brakes down to: A-7-5. There is also an "S" cast into the front, below the part number.
The GM casying #3839175 was originally used for some 63-64 Corvette SHP applications. It is a pump configured just as you describe. It was not used in Corvettes or any other car after 1964. However, it may have continued to be produced for SERVICE or truck applications. Your pump was, apparently, manufactured on January 5, 1965, since I don't think that this pump was in production as late as 1975.
It's unusual to find these pumps dated, but given the 1965 casting date, dating may have started by then. What's more unusual is the "S". I think that this probably refers to the Saginaw foundry. Rarely are Saginaw-cast pieces found with a casting mark like this.
The "S" on that casting MAY denote that it was cast in the Saginaw Service Parts plant, where many single-mold service part castings were made, especially after the main mold lines were converted to high-speed multiple-mold facilities in 1966. If Mark Gorney sees this, maybe he'll comment on that possibility.
Yes, it is possible. Chevrolet Saginaw Service Parts was located next to Grey Iron. Water pumps and many other castings were machined there for service. It has been closed for twenty years now. The 3839175 pump body was derived from the 3782609 casting and continued as the 3859326. The pattern number is relatively high, GM19, but usually patterns/tooling with fewer cycles were kept for service production. Water pump bodies, because of their size, were cast two per mold with the larger automatic lines casting six. The “S” and the date code identification were required by design/customer or the castings would not have been accepted.
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