Pston Ring Set - 4.000 1.2 1.5 3.0mm

The Piston Ring Set - 4.000 1.2 1.5 3.0mm from JE PISTONS is purpose-built for high-performance engine builders and serious enthusiasts who demand precision ring control and reliability in modified powerplants. Whether you're rebuilding a stroker engine, upgrading a forced-induction platform, or restoring a vintage performance build, this ring set addresses the critical need for proper compression, blowby management, and oil control across the entire RPM range. JE Pistons has engineered this set to work seamlessly with 4.000-inch bore applications, making it ideal for small-block and mid-displacement platforms where compression and durability cannot be compromised.

This ring set features a premium three-ring architecture: a 1.2mm top compression ring, 1.5mm second ring, and 3.0mm oil control ring configuration that delivers optimized pressure sealing and reduced friction across all cylinder walls. The 4.000-inch bore diameter is sized for engines requiring tight clearances and precise fit—critical for maintaining cylinder pressure in turbocharged, supercharged, or naturally aspirated high-boost applications. JE's manufacturing standards ensure consistent gap clearance and consistent radial tension, minimizing blowby while maximizing oil film strength. The total weight of 0.85 lbs reflects the precision-machined construction and material composition required for extended durability under elevated combustion pressures and sustained high-RPM operation.

This piston ring set is ideal for engine builders restoring or upgrading 4.000-inch bore engines across various platforms—from small-block Chevrolets and Fords to modern LS platforms and performance imports. Proper installation requires careful bore measurement, correct piston-to-wall clearance verification, and ring end-gap setting to match your specific engine combination and intended use (street, strip, or race duty). Compatibility with JE pistons and most quality forged pistons in the 4.000-inch range ensures optimal performance; consult your engine builder or technical resources to confirm ring gap specifications for your particular combination. This is an essential component for any serious rebuild where compression integrity and long-term reliability are non-negotiable.