Just to fill you in real quick, I bought my jet with a 455 in it. The motor only had 108hours on it, well it spun bearings in the #7 and 8 cylinders after 118 hours. This is the first engine I've had go that quick and upon tearing it apart, I am looking at it carefully to see what went wrong. I has forged pistons in it, which are still in great shape other that a little carbon on the tops, very little scoring on the cyl walls, rings all look good, but on the #8 piston, the wrist pin is very tight, I know, not normal. I have to take both hands to get it to pivot. Some move normal, some a little stiffer, but I noticed that on about 6 of the con rods where the wrist pin is, they are blueing. Some more than others, some with no discoloration. Is this a hardening process that is used and considered normal, or was something done wrong by the builder? Could there be other things that would cause this? Like oil starvation? Any honset input would be great. Thank you, HOD