Wiseco 3840H High-Performance Plasma-Moly Piston Ring Set – 3.840 in. Bore

The Wiseco 3840H is a high-performance replacement piston ring set engineered to fit a 3.840-inch bore and sized to equip a single piston. Wiseco ring sets are manufactured to exacting specifications to deliver superior combustion sealing, reduced friction, and effective oil control — all critical factors in both street performance and race applications.

Ring Set Highlights:

• Plasma-Moly Pre-Gapped Design: Part of Wiseco's Pro Tru line, this ring set features a plasma moly coating for excellent break-in characteristics and durability, and comes pre-gapped for straightforward installation
• Sold Individually Per Piston: Each set covers one piston — order the quantity that matches your engine's cylinder count
• Multi-Line Compatibility: Wiseco offers ring configurations across their product lineup, including NPR XX steel nitrided top rings with Napier-style second rings for Sport Compact kits, 1.2mm steel nitride and Napier GFX ring sets for late-model EFI and small block Chevy applications, and .043 back-cut top rings for select big block applications
• Superior Sealing: Compression rings seal combustion pressure while the oil control ring meters the lubrication film on the cylinder wall for proper heat transfer and oil management
• Race-Proven Engineering: Developed and tested for demanding performance environments where ring integrity directly impacts piston longevity and power output

Wiseco piston rings are the ideal replacement or upgrade solution when rebuilding or refreshing a performance engine. Always verify ring set compatibility with your specific Wiseco piston part number before ordering.