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Mahle Pro Series low‑tension moly piston ring set sized for a 4.000" bore. Built for performance applications, the moly face and reduced tension design promote improved ring seating and lower friction compared with standard rings. This kit is intended for engine builders and tuners specifying a 4.000" bore who want a durable, low‑tension ring solution without changing other engine components.
Mahle Rings Pro Series Performance Rings Low Tension 4.000 Bore Moly Ring Set
