318 marine motors?

There's different ways to reverse an engine. One way is to use a gear drive and reverse the cam. Of course the water pump, starter, etc have to be reversed

Some older boats with ONE engine used reverse rotation, I don't know why, unless the boat manufacturer had left- over left hand engines

One year someone turned in an "exchange" core out of a boat, and no one noticed--or said--that it was reversed. I ended up looking it over, and of course the rebuilder had put stock auto/ light truck stuff in the engine, turning it into a standard rotation engine, but the starter, etc was still the WRONG direction.

The other thing about a leftie is that some have oil slinger groves in the crank to encourage oil to remain in the main seal. Now that we have an auto crank in a leftie engine, this means the grooves on a stock crank do not throw oil back into the seal,

AND IT ALSO MEANS that the poor dumb farmer who got that marine leftie crank in his old Ford Y block pickup always wondered why the rear main leaked oil