Connecting bronze and stainless pipe fittings?

I want to use a stainless steel ball valve (http://amzn.com/B00O5D1ERG) at the point where my heater hose connects to my engine. There are already some bronze (I assume... guess they could be brass) fittings in the current valve-less connection, and I'd like to keep those - especially since one of the parts I couldn't find in stainless steel anywhere. (I could get a bronze valve, but it actually costs more and will take longer to ship.)

Is there any problem with connecting bronze to stainless steel above the waterline, but with (hot) water going through the connection? Corrosion is my concern. I'm guessing it's probably okay, since a bronze/brass fitting is currently connected to the port on the engine.


Thanks...