How do I tell if my 340 is internally balanced?

nm9stheham said

Or weight taken off the rods..... or the crank throw area....more than one way to skin that cat.

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Heavy pistons/pins/rods require weight to be added to the crank. Lighter pistons require drilling or grinding the crank throws and/or the balance pads on the big end of the rods. You cant remove weight from the crank and rods without removing it from the pistons.