I still have my McCulloch pro Mac 55 I bought new in the 70's... lol
It was a heck of a saw back then!, but I haven't started it in years!
SR
The last time I ran a McCullough was back in 79, all's I can remember for the short period of time I used it, the saw had a lot of vibration compared to newer saws, you remember that? Might of been just that one saw I used. I looked up that Mac 55 it seems quite peppy to me and this one is runing great, looks comparable to the 550xp, like to see a side by side test. Even that sound brings back memories...............
Mcculloch ProMac 55 - YouTube