If I recall the performance aftermarket water pumps for a small block chevy were rated at 25- 30 gpm at 1500 rpm. (1500-1800 gph)
A stock one should be even less.
An automotive water pump intentionally has slip built into it because if the coolant moves too fast it does not allow adequate time for it to cool as it passes through the radiator.
Probably not worth the effort unless you just wanted to say you did it.
If you are after something cheap and inefficient there are lots of old slip on to the pto shaft pumps from pull type sprayers to be had for next to nothing.
In a bind I used one to fill a 1000 gal water tank.
When on sale for around $100 you can usually find a 2 inch pump complete with China engine ready to go.
They are rated close to 10 000 gph
I have bought several of them over the years and they run circles around the pto sprayer pumps.
Doesn't take long till you are accurately able to guess how low the tank or trough is then put in 1/4-1/2 cup of gas, fire it up, walk away and it will shut down real close to what you are after.
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