-> The crankshaft usually doesn't matter.  However, a different camshaft
-> is required.  Often, a different rear main seal is needed.  A
-> different distributor should be used to keep wear on the point
-> blocks to a minimum.  Finally, a reverse-rotation or bi-directional
-> water pump will be needed.
Dan: Most marine engines do turn anti-clockwise, but not all as you have
stated. In a boat with two engines usually one will be anti-clockwise,
so that engine torque does not cause the boat to roll, I think
cavitation is also held to a minimum. Of course the direction of pitch
on the propeller is also a determining factor. You must remember that
both camshaft and crankshaft determine the direction of rotation, It is
possible that the crankshaft is reversed to provide the correct piston
timing, and that is possibly why a different rear main seal is used.
Most water pumps use a directional vane for pumping water, so that
either the water pump is replaced or somehow modified so that it turns
in the opposite direction.
-> No, the fuel pump operates normally, no matter which way the
-> crank is turning, unless it is belt or gear driven.
  I need to be corrected on the fuel pump, since most fuel pumps
operate off a camshaft lobe, except of course if the pump was gear
driven. I do think that most fuel pumps are electric, so that engine
rotation is not a factor.
                                                   George
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