> Now you've got me interested. I was concerned about the failure mode, but
> having 2 of them. Hmmmm. What does the stock (3rd gen) pump weigh? What has
> to be fabricated to hook them up? What do they cost?

I don't know about cost since the engine I'm looking at is a long block and includes one. But the data I have is that the pulleys and pump weigh about 10lbs. So even two electric water pumps is an improvement in weight.

> > Of course, what would a check valve look like for a 2"
> radiator hose?
> Maybe the pump itself will act as a check valve.

Maybe, but I'm not sure that's a great way to go. The water flow will want to follow the path of least resistance, and I'm sure there will be leakage through the second pump back to the first's inlet - it has to be less resistance than the radiator(s) and engine block... Given that this would be near the edge of the functionality to begin with, leakage would be a Bad Thing (imho).

Of course, you could also just run both pumps all the time...