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05 Kevin chose Mahle forged pistons, in part because they allowed him to utilize metric size piston rings. Measuring 1.5 mm, 1.5 mm, and 3 mm, these rings are narrower than the standard 1/16, 1/16, 3/16 rings utilized by the big-block Mopar. These rings reduce internal friction, equating to more horsepower and torque. The piston rings are file fitted for proper end gap.