So the 440 has a steel flywheel and the 460 has an aluminum one? Also, aren't the motor mounts different with the advantage going to the 440? Obviously the 460 has a little more power but at the cost of a pound in weight. However that may be an alright price to pay for some people. I like the idea of a 440 chassis with the 460 top end. Is that a simple swap of the piston and cylinder or is it more involved than that? Boston, do you know anyone who does woods porting that does a good job. I am going to have to do something about my 8 or 9 year old 460 soon and I'm not sure if I should rebuild my 460 and woods port it or buy a new saw. Either a 460 or, now that I have seen this thread, maybe get a new 440 and swap out the top end.