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The Diamond pistons feature a dished top, which lowers the compression from a flat-top or a dome piston. One of the key components to an engine's compression ratio is the piston design, which determines how much room the piston takes up in the combustion chamber at TDC. If the volume in increased, like with a dish (or inverted dome as some call it), then the compression ratio is reduced. If the volume is decreased like with a dome piston, then the compression ratio is increased.