Casting Number water pump

[Joseph K.]

Can anyone tell me if this is a corvette water pump? has a casting number of 330813. A guy and tells me is corvette ....I am looking for an original for my 75> any ideas....................TIA.............Joe

[Joe L.]

Re: Casting Number water pump

Joe-----

Yes, the GM casting #330813 was used for all 1972 through 1982 small blocks. In fact, other than some MD and HD trucks, this was the ONLY application for the 330813 casting. All 330813 castings have an external bypass fitting on the top. However, this fitting was used only for the MD and HD truck applications. For Corvette, it was plugged with an external square head pipe plug. That's how they came from Flint.