Piston Ring Set 4.155 Moly 1.2 1.5 3.0mm

The Piston Ring Set 4.155 Moly 1.2 1.5 3.0mm by JE PISTONS is engineered for serious engine builders and high-performance enthusiasts who demand precision-fit piston rings for demanding applications. File-fit construction ensures proper clearance and sealing when installed in cylinders bored to exact 4.155-inch specifications, making this set ideal for custom engine builds, racing platforms, and meticulous rebuilds where factory tolerances are not an option. These rings are designed to minimize blowby while maintaining proper oil control across extended engine operation.

Constructed from plasma moly-coated steel, the Piston Ring Set 4.155 features a three-piece configuration with 1.2mm top ring, 1.5mm second ring, and 3.0mm oil control ring thickness. The low-tension design reduces ring flutter and improves response in 8-cylinder applications while the plasma moly coating enhances wear resistance and reduces friction during break-in and sustained operation. JE PISTONS' Pro Steel Series rings are individually precision-ground to ensure consistent gap clearance and reliable sealing in both naturally aspirated and forced-induction engines.

This ring set is best suited for engine builders working with JE PISTONS or compatible aftermarket pistons in 4.155-inch bore configurations, including small-block and big-block applications across automotive and marine platforms. Installation requires precise ring gap filing to match your specific engine's bore and compression ratio, making this set appropriate for experienced technicians or professional machine shops. The low-tension characteristics make these rings particularly effective in high-revving naturally aspirated engines where traditional tension rings may cause excessive drag.