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Mahle Pro Series low‑tension moly piston ring set for a 4.000" bore. Intended for performance engine builds, this moly ring set offers reduced tension for improved ring seating and lower friction compared with standard rings. Use where a 4.000" bore specification is required—suitable for tuners and engine builders seeking a durable, performance‑oriented ring option.
Mahle Rings Pro Series Performance Rings Low Tension 4.000 Bore Moly Ring Set
