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Put side by side, it is easy to visualize the significant friction reduction when reducing ring widths. The 5/64-inch (.078-inch) ring, on the left, was the standard of the industry for decades. The 1/16-inch (.0625-inch) ring, in the center, was considered a race ring width, but was used as standard production in late-model Mopar Magnum engines. The .043-inch ring, on the right, is becoming increasingly popular in pro racing, particularly when used in conjunction with a crankcase vacuum pump system.