Water pump part number

[george romano]

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.

Thanks
George

[Joe L.]

Re: Water pump part number

George-----

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.

[John H.]

Re: Water pump part number

Joe -

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.

[Mark G.]

[George Romano]

Re: Water pump part number

Thanks to all of you. I appreciate the help!

George