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Mahle's performance plasma steel top ring set is specified with a 3.902‑inch diameter top ring at 1.0mm thickness and a .143in RW HVOF moly coating. This moly top ring assembly is presented for performance piston applications matching the 3.902in bore dimension and offers the described plasma steel and moly surface treatment for compatibility with precision performance engine builds.
Mahle Rings Performance Plasma Steel Top Ring 3.902in x 1.0MM .143in RW HVOF Moly Ring Set
