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The Mahle plain piston ring set for Napier THM-10 is sized 3.937 in bore with 1.5 mm ring width for use in engines built to the THM-10 specification. Supplied as a matched set, these plain rings are intended for engine rebuilds and repairs to restore proper sealing during piston installation and standard service. Use them to maintain correct ring sizing and fit during assembly procedures that require THM-10 dimensional compliance.
Mahle Rings Performance Napier THM-10 3.937 x 1.5MM Plain Ring Set
