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  • RPM Machine-Performance Auto Parts
    RPM Machine-Performance Auto Parts
    (877) 354-3812
    17644 W 1540 N, 84013  Cedar Valley

    When you examine a piston you rarely examine the bottom of the ring groove. Even if you looked at the grooves of the same style pistons, seeing a difference without a micrometer would be difficult. From manufacturer to manufacturer, however, there can be differences in what is called the root groov…