How much water should be expelled out the leg when flushing a 1997 5.7L V8 Mercruiser engine. Water pours outside the right side (drivers side) of the leg but only 1/2 the amount comes out the left (passenger side) when flushing the leg with the engine off. I replaced the impeller last year and this year I pulled off the exhaust manilfold, took it apart and cleared out what corrosion I could find in the water ports. I am concerned that there may be a blockage somewhere else. When I run the engine and flush it still pours out the right side fine but only a trickle on the left. I am just unsure how much water is normal and should actually be coming out on that left side. Thanks for any advice anyone has.