Ring lands WILL NOT CRACK unless your car runs lean, period. The thing that cracks ring lands is getting the internals way too hot, the rings and pistons expands as they are supposed to. when the rings touch ends (supposed to have between .010 and .028 clearance) it is like hitting the brakes in the piston usually ripping the top off at the same area they meet. Don't run the car lean and it will be fine as long as you have it. I have ran the shit out of mine on a stock bottom end and never damaged a piston or anything else, just the stock oil control rings. Be smart and understand what you are doing and you will be fine dude.