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4 One issue with the Chevrolet crate motors is that they use a weight on the flywheel to help balance the crank. We want the engine to be internally balanced, so even though the rod and piston combination we'll be using is quite a bit lighter than the stock stuff, the rear of the crank still required just over 80 grams to be added. The ideal solution would be to add heavy metal to the counterweights, but that's outside the price range of most real-world Street Stock builds. So we accomplished the same thing by welding up a couple lightening holes that had already been drilled into the rear counterweights from the factory. We intentionally added too much weight so that we could then go back and turn down the counterweights on a lathe to help clean up the crank a bit and reduce windage. Here, Allmond deburrs all the rough edges.