[Jim Brierley]

Early '28, so-called 'beaver-tail' cranks weigh 27 lbs.
Later A's weigh 29 lbs.
B cranks, 39 lbs.
C cranks, 46 lbs.
BB cranks, 58 lbs. (pressed-on, 1" wide weights. So called because these were added by authorized Ford rebuilders when a 'B' engine was rebuilt, mostly on 'B' trucks.
I may have some weights I planned on putting on a 'B' crank, I'll look for them.

A & B engines have naturally occuring vibration points, at about 800-900, 1600, and 2300 (this from my menory) They are heard more than felt, in most engines they aren't noticeable, and usually when being driven, not sitting in your driveway.