Wrapping my head around balancing

67Dart273 said
A stock 5.9 is NOT (factory) internally balanced!!! Are you saying this engine had previously been "built" and internally balanced by a machine shop? In either case, tho, changing ANY weight will change balane, AKA changing rods or pistons

On the other hand just how wild is this thing? Many of those pistons may be designed for "stock like replacement" even though they are not necessarily same as factory weight. If this is a 6K/ under RPM street car you may be worrying about nothing.
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Nope, not saying it is internally balanced YET but assume it will need to be once i change pistons/rods. I guess i wont know what balancer or flex plate or converter it will need until i get everything over to the machine shop. It will be a mild build no more than 5600 rpm with street manners, roughly 26-2800 stall and a 3:55 gear. Not a race car by any means and i like it that way. Just want it to live a long life on the street and have some punch when I'm feeling playful...