Question: Water Pump

[paul robb]

Does anyone know what this water pump fits or what years it may fit ?
The only numbers I could find any were on the pump were the casting

numbers. 30570
A
- 21

 

[JohnZ]

Does anyone know what this water pump fits or what years it may fit ?
The only numbers I could find any were on the pump were the casting

numbers. 30570
A
- 21


View attachment 8419

That's a non-GM generic aftermarket rebuilder casting - made as a rebuilder replacement for the GM 326 water pump that was used on engines with a bypass hose to the intake manifold.