Personally, I doubt most people could tell on their first try...
If the engine is horizontal (on the floor), this makes it even harder.
I find it easy to do when the engine is vertical, like on the engine stand right after assembly.
You can push up the front pulley boss an hear the click-click as it goes up and down.
If the engine is horizontal, I would take a measurement that is easy to replicate either from the front pulley boss or the rear counterweight / flywheel.
Kick the front pulley boss *OR* rear CW / flywheel - take measurement.
Kick it the other way - take measurement.
As long as you get some kinda measurement and NOT "0", you're good.
-Ted
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