well if it is a marine Reverse rotation crank it is different than a standard rotation one . a R R crank is ground different on the rear main journal , using one in a standard rotation will result in a constant oil leak at the rear seal .
Aggree. I heard an engine builder mention that the knurling at the rear main on the crank would actually draw the oil out, instead of keeping it inside the rear main, if you changed the rotation.
