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The Mahle GNS severe-duty top ring for a 4.320 in bore is a 1.5 mm top ring supplied with +0.005 tolerance for file-fit installation. Provided as a top-only replacement, it is intended to be fitted to the bore by filing to final dimensions. Use this ring when matching a 4.320" cylinder to restore combustion sealing and proper ring engagement after machining or wear.
Mahle MS 4.320in 1.5mm GNS Severe Duty Top Ring
