Wiseco RCS41350 Tapered Ring Compressor Sleeve 4.135 in. Bore

The Wiseco RCS41350 is a 4.135-inch bore tapered ring compressor sleeve engineered to simplify piston installation during high-performance engine builds. Forged in-house in the USA, this sleeve delivers the same material toughness as Wiseco's renowned forged pistons, ensuring a professional-grade tool that stands up to repeated shop use.

Unlike traditional band-clamp style split ring compressors that can pinch or damage modern thin piston rings, this tapered sleeve design features a smooth radius that gradually narrows down to the precise bore diameter. This allows piston rings — including thin, high-performance oil rings — to compress smoothly and evenly with minimal risk of bending or breakage.

Key Features:

• Bore Size: 4.135 inches — sized for compatibility with 104–105/109mm pistons
• Forged construction — machined from Wiseco sleeve forgings for exceptional durability
• Hard-anodized and Teflon-coated interior surface for low friction and prolonged wear resistance
• Smooth tapered radius compresses rings evenly, reducing the risk of ring damage during installation
• Greatly reduces difficulty of installing thin, high-performance oil rings
• Laser-marked with bore size indication for quick identification in the shop
• Made in the USA at Wiseco's Mentor, Ohio manufacturing facility

The Wiseco RCS41350 ring compressor sleeve is an essential tool for any engine builder working with high-performance or forged pistons. It eliminates the frustration and risk associated with conventional ring compressors and helps ensure a clean, damage-free piston installation every time.