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You may have heard the term slug of mallory used in reference to an engine build and wondered what a slug of mallory actually looks like. Mallory is a metal that has more than twice the density of steel. Here's a close-up photo of one of two slugs of mallory that Rocco added to the counterweights on each end of the new 3.250-inch Scat crankshaft. Our stroker is balanced at 28 ounces.