They'll cut with a stock 660 in up to about 28-30" wood. The 91cc Stihl will start pulling away from there as the wood gets bigger (although the Mac will handle the wood fine). Biggest bar I run on the 82cc Macs is 32". Have ran my SP-81 with the 32" b/c quite a bit in wood up to 40" or so (Doug Fir, oak, and maple mostly). That Mac handles it surprisingly well. The manual oiler is helpful to keep those longer bars oiled too. When cutting big wood with these saws, they run out of fuel and oil fast. Tanks aren't very big.
I have a friend who has some 40-42"ish bars for these saws. Don't think he's ran them. He has tons of old saws/bars/etc as he's putting together a logging museum (will be at the Antique Powerland in Brooks, Oregon). Biggest bar I've seen in use on these Macs is 36". One of my SP-81's (a locked up project/parts saw that lived a hard life) came to me wearing a 32" b/c with .404 chain (98DL of skip chisel). That's a lot of load for any 82cc saw.
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