Wiseco RCS40650 Piston Ring Compressor Sleeve 4.065 in. Bore Black Anodized

The Wiseco RCS40650 is a precision-engineered piston ring compressor sleeve sized for a 4.065-inch (103.25mm) bore. Forged in-house in the USA, this tool is designed to make piston installation smooth, accurate, and damage-free during high-performance engine builds.

The sleeve features a tapered, smooth-radius design that gradually compresses piston rings down to the exact bore size, allowing the piston to seat evenly without snagging or distorting the rings. A hard-anodized, PTFE (Teflon) coating reduces friction and ensures long-lasting wear resistance through repeated use. The sleeve is also laser-marked with its bore size for easy identification in the shop.

Key Features:

• Forged aluminum construction — made in the USA
• Hard-anodized black finish with PTFE (Teflon) coating for low friction and durability
• Tapered sleeve with smooth radius compresses rings evenly and smoothly
• Greatly reduces difficulty of installing high-performance oil rings
• Laser-marked bore size for quick identification
• Bore size: 4.065 in. / 103.25mm
• MPN: RCS40650

The Wiseco RCS40650 ring compressor sleeve is an essential installation tool for any serious engine builder working with 4.065-inch bore pistons, ensuring professional results and protecting expensive piston and ring components during assembly.