Hi bwalker etal, I didn`t suggest a 385 because the 385 wasn`t in the original question, presumably because they weigh ~ 2# more and cost ~ $130 more than a 372. Since we are talking a max diameter of 40", a 24" bar will easily do the job and from my experience the 372 and 385 are very close in performance with this bar. I have both and have deliberately run them against one another to see how they stack up. When I put the 34" bar on is when you start to see a significant difference between these saws. Now for the question of whether or not an 036 will do the job. Considering that a 24" bar will be all that is needed for reach, why not? The 036 has nearly 4 1/2 hp and should pull a 24 without too much trouble. You might want to try skip chain, and even square ground if you have a reliable means of sharpening it. I think You could also run a narrow kerf .325 chain on this saw to give it more long bar capacity. A couple of no brainer points are even more crucial for this setup, make sure that all the cutting parts, ie; bar, chain, sprocket, powerhead, are maintained as close to perfect as is humanly possible. The 036 will put them on the ground, maybe not as quickly as some others. What have you got to lose by trying it, assuming you know what you are doing felling trees of this size? Russ