"Please understand this about
"Please understand this about pistons: To reduce piston slap (which happens when the piston starts up the bore), the piston pin is deliberately located about a 1/16 inch off to one side. (It may look centered, but it's not!) Now, if the motor rotates the other way, the piston slap is opposite as well--it whacks the other side of the bore coming up.
So, if the pistons are not reversed, you end up with DOUBLE the offset in the WRONG direction! The result will be a very noisy engine that might blow pistons some day.
Jeff"