The bearings in my water pump are failing and can be heard with a bit of a grinding noise during the first minute of a cold start. Lately I seem to be getting slightly higher than normal engine temps as well. I want to replace the pump and I even have the pump off of a spare engine as a reference but I can't distinguish standard rotation from reverse. To make this worse, the GMB catalog has a conflict between performance parts where two of differing rotations will fit the same engine.
All I can say is the rotation direction matches that of the crankshaft pulley. Is this standard or reverse?