The piston bottoms look like they are coming out of the bottom of the cylinders,yes? If so mine look like that also and they measure good, check yours to see(if you have the original specs on them) if they are worn or not. I have found(and have quit using them) that the Ross piston skirts seem to be very delicate and show damage(scratching) when they are not worn I have now switch to Diamond Pistons for that very reason