I've disassembled a 2001 2.7 for two spun rod bearings. I've noticed that the pistons don't seem to "flex" very easily on the rods. In fact if I were to put a fish scale to them it would probably show 2-3 pounds of "pull" to get them to move. All the pistons I've dealt with before (non-Dodge) have flopped easily from one "tilt" to the other. The clearance specs are pretty tight and I know two of them have undergone some stresses due to the spun bearings but all six are the same. Is there a standard?