David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting

I am far from the guy to answer a balancing question but i will give you what i think i know
they us a tool that pivots on the small end of the rod and weights the other end.........and i thing they do the same for the other end.
then that is figured out some way with a mathematical equation and then they bolt that weight on the rod journal and then spin it in a crank balance machine balance to see were it is out of balance.
Basic concept is like a driveling balancing machine.
let me see if i can find something for you.

There is a ton of grate info on U-tube!!!!!!

Here is a real good one on balancing cranks!