They were just about to go John. I seen the hair line cracks when I took out the first piston. I literally pressed it with my finger nail and the side of the piston fell apart in me hand.. Insanely lucky not to break before that and destroy the bore.. 5 minutes with a honer and it would be brand new again.. How much of an advantage is there of goin over sized. What extra horse power or torque would be gained by an extra mil or two over sized? Genuine question I'm not bein smart