Piston Ring Set 4.320 Moly 1/16 1/16 3/16

The Piston Ring Set 4.320 Moly 1/16 1/16 3/16 from JE PISTONS is a premium race-series engine component engineered for high-performance eight-cylinder applications demanding superior compression seal and durability. This piston ring kit is designed for builders and engine specialists who require precision file-fit installation and maximum reliability in competition or extreme-duty environments where standard tension rings may fall short.

Manufactured from ductile iron with plasma moly surface treatment, this ring set features a 4.320-inch bore diameter and a specialized three-piece configuration: 1/16-inch top ring, 1/16-inch second ring, and 3/16-inch oil control ring. The plasma moly coating significantly reduces friction, minimizes blow-by, and extends ring life under extreme heat and cylinder pressures typical of racing engines. File-fit design ensures custom fitment for precise ring-to-groove clearances, delivering optimal sealing efficiency and improved combustion chamber stability during peak power strokes.

Engine builders, race teams, and serious performance enthusiasts benefit most from this ring set when rebuilding small-block or similar displacement eight-cylinder engines where compression and oil control are critical. Installation requires careful bore measurement and filing for exact clearance fitment; compatibility with your specific engine block and piston design is essential before purchase. This kit delivers measurable power gains and extended durability in naturally aspirated or boosted applications when paired with proper machine work and attention to OEM specifications.