I've got an Sp 81 also in addition to the 805/850.Either one does real well running a 32" with skip chain .
I've heard they made up tp 42" bars used in the PNW but have never seen one .
I have about enough parts to build another 850 when I get the time .
I heard it said the 82 cc Macs would cut about as good as an 066 but I rather doubt it .They will hang with a 281 Huskey though about even Steven .Got one of those too .