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The Mahle GNS severe-duty top ring for a 4.310 in bore is a 1.5 mm top ring supplied with +0.005 tolerance and provided as a file-fit component. Intended for use where a replacement top ring is needed, it requires filing to final size during installation. Match the 4.310" bore and tolerance when fitting to restore combustion sealing at the cylinder head.
Mahle MS 4.310in 1.5mm GNS Severe Duty Top Ring
