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Mahle plasma-moly moly top ring set specified at 4.170" x 1.5mm .151 RW as a matched ring set for performance engine use. These moly-faced top rings are intended to provide improved wear characteristics and sealing for engines requiring this exact ring dimension and material treatment during rebuilds or replacements.
Mahle Rings Performance 4.170in x 1.5MM .151 RW Plasma-Moly Steel Top Ring Moly Ring Set
