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The standard (read: cheaper) way to balance a crankshaft is to drill holes into the ends of the counterweights to lighten them. The problem with this is the holes actually create windage and burn horsepower. Instead of drilling holes, RCE carefully cuts down the counterweights on a lathe. This is a more labor- and time-intensive process because you have to be very meticulous with your cuts, but it not only leaves a smooth counterweight, but the length of the counterweight is also shorter, reducing windage. This method of crank balancing is more expensive, but considering a crankshaft can be used for several rebuilds in these lower horsepower engines, the extra cost isn't that extreme.