well why doesn't someone PM jerry about the question? i haven't been watching this since its a small block thread.

on the big block and i would assume small block too otherwise the pump wouldn't function at all. if you buy a water pump that has a anti cavitation plate welded or riveted to the impeller then it will work in either direction. mind you this is in regards to LA small blocks. i believe the factory magnum waterpump is reverse rotation as i looked at stealing the impeller of that for my big block setup but it wasn't worth the effort. i run a milodon HV water pump on my car and it work fine cooling my big block.

next time theres a question PM me and ask me to respond to the thread its not like you don't know my user name.