I just bought a 372 off a guy and he also had a big ole Stihl in the trunk. All the tags are off and I couldn't ID it with them. I checked the air filter and intake and part numbers started with 1111. Hoping someone could differentiate between models in that family. hdtoolmkr765 Stihl Livin stihlsmoking
I am pumped about the 372 I brought home. I had to share. complete with 20" b/c, non runner $50. Also a sheet metal break for $50.
You could turn that 051 into a 075 (111cc) you just need a piston and cylinder you can get aftermarket ones fairly cheap. You just won't have the manual oiler.