When ya send that piston off tell em you want plenty of valve reliefs for large cams.
those go over the chain sprockets. judging from the size of it ..looks like it would go over the rear ..but i could be incorrect ... but it does indeed go over a chain sprocket.
Since these are gonna be YOUR pistons made by CP I would call em the smo0oth pistons! Your pioneering alot of stuff for the XX guys that will need this info/parts/services later. Sure there are companies that have built XXs for race teams but you are doing it for the regular Joe.