That said, there is always some minor degree of piston rock and this is increased as piston skirt gets shallower and forged pistons are used due to increased clearance. I took your post to mean there is a large amount of movement, I could be wrong.
Well it's noticeable and reasonably easy to rock. I am not sure what the clearance should be on a stroked engine with a forged piston. Maybe I can look up the spec sheet (I've got it at home but I'm on the road) and see what the spec is.