I'm asking 500$ shipped pho in the lower 48, sold as is, no gurantees. Saw may blow up tomorrow. I split the case to install an new case gasket since old one was leaking. The bearings stayed in place, so I just put it back together since bearings felt new. I regret that now, but that's the way it is, I haven't had any problem with the saw yet. Runs fine for me.
That's what I've been told as well, and the diagonal fin cylinders produced by KS are the cream of the crop. I have no actual experience, just what I've been told. I assume these cylinders have more optimal port timing. Or can be ported stronger, or hopefully an expert comes along in a minute and explains the real reason.
I have 2 KS jug 10 mm saws, and both very very strong stock. One is now ported with Randy's "new recipe" and is even stronger.
I have seen other strong running 044/440s, and not, but I think the KS jugs were just consistently among the strongest running. With a DP muff cover and HD-2 filter (or max flow), they will hang with a lot of 046/460s with the same modifications.
I have also seem some rather anemic 440s out there.
There were Mahle angle fin 10 mm jugs, and angle fin 12 mm jugs also (some of the early ones).
The jugs are likely the biggest reason for any performance difference, but the 10 mm saws also have slightly smaller case volume.