That isn't balancing the pistons though. Balancing the rotating assembly is where you match each piston and rod to each other, and the crank to this weight. Anything that bolts to the crank can also be included to get the balance set.
This makes the engine run much smoother, which will help everything from durability to peak RPM potential, power output, and efficiency.
You should drain the coolant and spray the cylinders down with WD 40 after the water is removed. Rust in there is not good.
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