Nope. Most decent pistons are within a gram. Rods take maybe 10-15 minutes to balance. The math takes 5 minutes.
Assembling the bobweights and spinning the crank takes the time. Especially if someone else has been in there before. Or, you are removing a ton of weight.
The weight moves around the counterweights and does strange things when you remove a bunch. It just takes time.
To get a balance job down to 10 grams is pretty quick. 5 grams takes a bit more and under 2 grams will drive you nuts. Plus, it isn't right until it repeats.
Also, you just can't throw the bobweights on there.
