A (forged) 340 Crank is Not a (forged) 273/318 Crank?

There is a certain amount of unbalance that is acceptable in production work. 318's/forged 340s were neutral so everything was neutral balanced. 360's were externally balanced so their balancer had the weight on it. The closer you got to true neutral balance ($$) , the smoother the motor became. My 1UZFE Lexus V8 can idle with a nickle balanced on its edge on top of the intake. They also said that that line had $1B in develpoment cost. Its all in the bottom line.