Piston Ring Set 4.390 Bore 1/16 1/16 3/16

The JE PISTONS Piston Ring Set 4.390 Bore 1/16 1/16 3/16 (SKU JEPJ10008-4390-5) is a premium race-series ring kit designed for high-performance eight-cylinder engines. This set is ideal for engine builders and machine shops looking to enhance performance in demanding applications, particularly in racing environments.

Constructed from ductile iron and featuring a plasma moly coating, this four-piece ring set ensures superior sealing and reduced friction. The 1/16-inch top two rings provide optimal gas sealing, while the 3/16-inch oil ring effectively manages crankcase ventilation and lubrication. The low-tension design minimizes parasitic drag, enhancing power output and fuel efficiency.

This piston ring set is particularly beneficial for those performing full ring and cylinder refreshes, as it requires precise cylinder wall preparation and careful installation clearance verification. It is specifically designed for mid-range to large-displacement eight-cylinder engines, making it a valuable addition to any performance build.