SPEED-PRO R20101 ProSeries Plasma-Moly File Fit Piston Ring Set 4.000'' + 0.040''

SPEED PRO R-20101-040. Condition: New - Other. This piston ring set is 0.040'' over size. This is the exact size you will receive. Pro Series Plasma-Moly File Fit Ring Set, 4.000'' + 0.040'' bore size. Pro-Series ring sets are designed for serious racing, with several features that maximize horsepower potential. These rings are not recommended for street use! Pro Series sets incorporate reduced radial wall thickness rings for lower tension and enhanced sealing. They also use a very low tension, thin profile version of the SS50U, which includes a wire latch mechanism to simplify installation. This ring combination gives dependable sealing and allows maximum power production. A system creating a vacuum in the crankcase is highly recommended.