SKU: JEPJ71408-4040-5
UPC: 193564240910
MPN: J71408-4040-5
The JE PISTONS Piston Ring Set 4.040 .043 .043 3.0MM is a premium race-series ring kit engineered for high-performance eight-cylinder engines demanding precision bore fitment and low-tension operation. File-fit construction at 4.040-inch bore diameter ensures exact control during installation, while the dual .043-inch compression and oil-control rings with 3.0MM thickness deliver optimized gas sealing and minimal drag across the piston face.
Construction combines steel with plasma moly coating, a wear-resistant surface treatment that reduces friction against cylinder walls and extends ring life under sustained high RPM conditions. The low-tension design minimizes blow-by while reducing parasitic loss—a critical trade-off in racing applications where every fraction of a horsepower matters. The .043-inch ring thickness provides the structural rigidity needed for aggressive combustion pressures without excessive weight, supporting the engine's inertial characteristics.
This ring kit is purpose-built for engine builders, race machine shops, and enthusiasts performing eight-cylinder top-end rebuilds where OEM specifications require a 4.040-inch bore diameter. The file-fit requirement means these rings must be individually fitted to match piston and cylinder specifications—not a drop-in solution, but a precision component for builders who understand the demands of custom engine assembly. The plasma moly coating and optimized ring geometry make this set suitable for turbocharged, supercharged, and naturally aspirated platforms running higher boost or fuel loads than stock configurations permit.
JE Pistons' race-series ring technology represents decades of motorsports development, favored in road racing, drag racing, and circle-track competition where seal integrity and ring durability directly impact reliability under extreme conditions. Proper fitment, installation clearance, and end-gap verification are essential for optimal performance—consult your engine builder's technical specifications before installation.
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