The harmonic damper in the front will have an offset weighted section on an externally balanced crank. The cast crank engines were supposedly all external balance.
Since it's been rebuilt, it could have been internally balanced then....if so, it's probably got some Mallory metal in it or the balance holes welded up, but that's pretty unlikely unless the guy was changing parts as well. S/F....Ken M
There is no damper on it now. The guy didn't have a build sheet and said all her can recall is they put a mild cam in it. I'm guessing I should assume it is externally balanced and get the weighted fly wheel and damper?