PAI 505134 Piston Ring Set 0.50mm Oversize for Cummins QSB - New

Genuine PAI 505134 piston ring set, 0.50 mm oversize, listed by PAI against Cummins OEM reference 4089181 for the Cummins QSB engine series. One (1) single-cylinder set: chrome-faced top compression ring (marked TOP 50), second compression ring (marked S2), and multi-piece oil control ring with expander — one box required per cylinder.

Application: Cummins QSB series, 0.50 mm oversize, per the manufacturer's box label. The specific QSB displacement and bore must be confirmed against your engine serial number and CPL; oversize rings must match your actual rebored cylinder size.

Condition: New / NOS, open box. Rings are unused with factory finishes intact and show no rust or damage. Supplied in the original PAI carton with factory label.

Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase.