Does Crank Stroke Affect External Balance

I wouldn't go that far, the rotating masses are weighed by the balance machine, at a certain RPM and are not assigned values. When its 'bobbed up" (matching bob weights attached to crank and spun up) the machine will tell you where to add/subtract what amount of balance as needed in degrees. ie. -12g at 240 and at axial distance (front middle or back of crank). The machine operator turns the crank so 240 is straight up and then he drills the crank (he has a drill press on a sliding arm over the crank) x amount of mm's to reduce that point by 12g. He then spins the crank up again and he gets his next point. If he needs to add, he drills a .750 bore and presses in a slug of Tungsten (W) on the side of the throw (or on top but it will require a weld to set it) then has to counter balance that fixed mass by drilling somewhere else. They will balance to a certain +-g as you can balance that thing all day and never get it absolutely 0. The '4g of oil' is an estimate anyway and changes at different RPMs so your balance tolerance is probably +-5g easily. The 360 external motors were built then spun as a unit and then dynamically balanced by the balancer (maybe). This allowed a lighter cheaper cast crank to be used with the other forged components. The weight had to be added and the throws were not available as they were sealed under the pan already. Not sure of they were able to zap the weights to the convertor on the line or they came 'pre-balanced'. Heck, they may have been pre calculated off the line and just assembled 'as is' to accept a pretty close balance. Anyone have a butter smooth 360 at idle? Have to ask an assembly line worker how the dynamic balance was performed at the engine plant as the 360 balancers looked 'as cast' for their imbalance, no additional holes in the front or backside ala 318.