Piston Ring Set 4.375 Moly 1/16 1/16 3/16

The Piston Ring Set 4.375 Moly 1/16 1/16 3/16 from JE PISTONS is engineered for high-performance and modified engines where precision ring fitment directly impacts compression, blow-by control, and longevity. Built for enthusiasts rebuilding big-bore or stroker engines, this ring set addresses the critical transition between stock and heavily modified powerplants where standard rings fail to seal properly. Whether you're refreshing a race engine, turbo application, or naturally aspirated build, choosing the correct bore diameter and ring thickness is non-negotiable for reliability and peak power output.

This piston ring set features moly-faced compression rings (1/16-inch and 1/16-inch top and second rings) paired with a 3/16-inch oil control ring, a proven geometry that balances gas sealing efficiency with minimal friction and wear on cylinder walls. Moly coating on the compression rings reduces initial break-in friction while providing superior scuff resistance under high-load and high-temperature conditions—critical for turbocharged, supercharged, or nitrous oxide applications. The 4.375-inch bore diameter accommodates performance builds using JE or similar oversized pistons, ensuring OEM-level fitment tolerances that prevent excessive blow-by and maintain ring seal consistency across the entire power band.

Mechanics and engine builders trust JE PISTONS ring sets for forced-induction platforms, endurance racing engines, and any application demanding durability beyond factory specifications. Proper ring installation requires careful piston-to-wall clearance verification and correct end-gap spacing for your specific bore; consult your engine builder or technical documentation before assembly. This ring set is compatible with JE piston part number J10008-4375-5 and similar performance pistons designed for 4.375-inch bore engines, making it an essential component for any serious performance rebuild or overhaul.