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The Mahle GNS severe-duty top ring for a 4.280 in bore is a 1.5 mm top ring supplied in +0.005 tolerance and intended as a file-fit component. Designed for high-duty applications where a replaceable top ring is required, it must be filed to final fit during installation. Use this top ring to reestablish proper sealing at the combustion face when matching the 4.280" bore and fitting tolerance.
Mahle MS 4.280in 1.5mm GNS Severe Duty Top Ring
