water pump

[DCVING 6]

So I had a water pump in my garage that I had purchased *I think* from GMpartsdirect a few years ago when I had bought a few other items. It's in an AC Delco box part # 251-174, then has the GM # 12307821. Physically it looks the same as what came off the car, but my searching shows it's for a '75-'81 Buick V6.

Anyone have the correct #

 

[Dlynch1130]

Highway stars shows a replacement water pump for the ‘86/’87 AC Delco part number #252-582 (Aluminum). They also show the original pump as AC Delco #251-639 GM part #25527536 (Cast Iron). 251-639 you can find on ebay and other sites. The best price is on Amazon for $80.80.