CHEVROLET 6L80 AUTO 6-SPD

Manley pistons are machined of high strength 2618 material. Each design is lightweight yet robust enough to deliver long service life. Perfect ring groove to skirt squareness is achieved through our unique "one fixturing" manufacturing method that assures maximum horsepower. Features: 2618 high strength material; Lightweight design; Offset wrist pin design; Machined for reluctor wheel clearance; Round wire locks; 1.2, 1.2, 3mm ring package; Forced pin oiling, pressure balance groove and precision pin fitting. Premium Chrome Moly wrist pins (Standard Series) included, 9310 alloy pin (Extreme Duty Series) included: P/N 42542 2.300 x .210 wall (4.065-4.080 bores) and P/N 42528 2.500 x .210 wall (4.125-4.130 bores). Benefits: "Contour forgings" provide the optimum balance between strength and weight with no grain-interrupting internal milling. Proprietary multi-step top ring groove machining process assures optimum control of the groove's size, geometry, flatness, and finish. All final turning is performed in one fixturing resulting in complete squareness of rings to the cylinder wall. Federal Form-Scan gauging validates ideal skirt indexing to pinhole and skirt-to-skirt polarity. Value-added features such as a pressure balance groove included in all series. Precise pinhole machining results in an exact compression distance as well as precise lock ring groove spacing, size, and concentricity.