Wiseco RCS40400 Tapered Piston Ring Compressor Sleeve 4.040 in. Bore

The Wiseco RCS40400 is a tapered piston ring compressor sleeve precision-engineered for a 4.040-inch bore diameter. Designed to make piston installation faster, cleaner, and safer, this tool is an essential addition to any professional engine builder's or performance enthusiast's toolbox.

Key Features:

• 4.040 in. (102.62 mm) bore size — sized specifically for accurate, snug fitment during piston installation
• Machined from Wiseco sleeve forgings — delivers the same material toughness as Wiseco's renowned forged pistons
• Hard anodized and PTFE (Teflon) coated — provides low-friction operation and prolonged wear resistance
• Smooth tapered radius — guides rings evenly into the bore without catching or snagging
• Compresses rings smoothly and evenly — greatly reduces the risk of bending or breaking thin, high-performance oil rings during installation
• Universal piston compatibility — works with pistons from any manufacturer, not just Wiseco
• Black anodized finish — corrosion-resistant and durable for long shop life

Installing thin, high-performance piston rings — especially delicate oil rings — can be one of the most frustrating and risky steps in an engine build. The Wiseco RCS40400 eliminates that risk by compressing piston rings smoothly and uniformly as the piston is guided into the cylinder, preventing costly bent or broken rings. Whether you're building a performance street engine or a dedicated race motor, this sleeve delivers professional-grade results every time.