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The Mahle GNS severe-duty top ring for a 4.390 in bore is a 1.5 mm top ring supplied with +0.005 tolerance and intended for file-fit installation. As a top-only replacement, it must be filed to the final size during fitting. Use this ring when matching a 4.390" cylinder to restore combustion sealing and proper ring seating after machining or wear.
Mahle MS 4.390in 1.5mm GNS Severe Duty Top Ring
