When in front of the engine/airplane using a starter the running direction will be counter clockwise in virtually all cases.

Many engines can start in the other direction most often when using a chicken stick but they will not run properly and should be allowed to stop or shut down. Using a starter your direction will be counter clockwise. Some folks in starting with a chicken stick will bump the propellor backwards and the engine will kickinto the right direction.

To run the other direction involves a major induction port timing change which means either a decicated reverse running crankshaft or some engines with rotating front bering cases can be rotated 180 degrees for reverse running. One of these engines would also require a reverse pitch prop normally used for a pusher aircraft but installed backwards from that application.

John