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The Mahle GNS severe-duty top ring for a 4.350 in bore is a 1.5 mm top ring supplied with +0.005 tolerance and intended for file-fit installation. Supplied as a top-only ring, it must be filed to final size during fitting. Use this component when matching a 4.350" bore to reestablish combustion sealing and proper ring contact in heavy-duty or rebuilt engines.
Mahle MS 4.350in 1.5mm GNS Severe Duty Top Ring
