Hi!
I've seen a lot of those McCullochs and have yet to see one of the 28-32cc ones as pictured with anything but ball bearings on the crankshaft and needle bearings on the rod and pin. While i'm at it I have also yet to see one of those early style Mac's from kioritz to have anything but a forged steel rod. Only the late non-kioritz engines with out the fullly supported crank have the aluminum rod.......... farley9n