Wiseco Pistons 3740XJ XJ Type Replacement Piston Ring Set

The Wiseco 3740XJ is a premium replacement piston ring set designed for high-performance engine applications. This complete XJ-type ring set includes everything needed for a professional rebuild: top ring, compression ring, and oil ring assembly.

Ring Set Components:

• Top Ring: Ductile iron construction with soft nitriding coating for superior wear resistance and heat dissipation
• Compression Ring: Taper-faced design with Ferrox coating on iron base material for excellent sealing and durability
• Oil Ring: 3-piece low-tension design optimized for efficient oil control and reduced friction

Advanced Coating Technology: The soft nitriding coated sides make these rings compatible with both standard and plated cylinder applications, providing versatility across various engine builds. This specialized coating enhances ring longevity while maintaining proper sealing characteristics in demanding conditions.

Identification and Ordering: Ring type and bore size (measured in millimeters) are stamped directly on the piston dome for easy identification. Always reference this stamped information when ordering replacement rings to ensure correct fitment for your specific application.

Wiseco's precision manufacturing ensures consistent ring gap, proper tension, and reliable performance throughout the engine's service life. These rings are engineered to meet or exceed OEM specifications while providing the durability expected in racing and high-performance street applications.