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Mahle Pro Series ultra low-tension moly piston ring set, sized for a 4.000" bore. Crafted for performance rebuilds, this moly ring pack reduces friction while maintaining sealing for combustion chambers in tight-bore engines. Supplied as a complete ring set, it’s suitable for engine builders seeking lower parasitic loss and controlled oil management in performance or high-duty applications.
Mahle Rings Pro Series Performance Rings Ultra Low Tension 4.000 Bore Moly Ring Set
