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Mahle OE plain ring set specified for a 4.625" bore and .043" thickness is provided as an OE‑grade piston ring kit for reliable sealing and compression restoration during engine rebuilds. The steel Napier THM‑13 set is intended for service replacements where original ring performance needs to be reinstated, supporting consistent combustion and oil control when installed to manufacturer tolerances.
Mahle Rings Steel Napier THM-13 4.625 Bore x .043in .135 RW Plain Ring Set
