Clevite 40843CP020 Plasma-Moly Piston Ring Set Bore - 4.380

The Clevite 40843CP020 is a premium plasma-moly piston ring set engineered for professional engine rebuilds and performance applications. This complete 8-cylinder ring set features advanced materials and coatings designed for immediate seating, reduced friction, and extended service life.

Advanced Ring Technology:

• Top compression ring: Cast iron with plasma-moly facing and barrel-shaped contact area for efficient compression
• Second compression ring: Cast iron with phosphate coating and reverse twist design for superior groove sealing
• Oil control ring: CP-20 assembly with 20-degree ear angle for optimal cylinder wall sealing
• Ring thickness: 5/64" top, 5/64" second, 3/16" oil control
• Pre-lapped rings seat immediately, virtually eliminating break-in time

Precision Engineering:

• 4.380 inch bore diameter (+.020" oversize)
• CNC-controlled gap chamfer optimizes compression and reduces blow-by
• Taper race machining on intermediate rings enhances contact
• Chemical polished oil ring expander improves oil drain back
• Standard tension design

MAHLE Original piston rings deliver OEM-quality performance with installer-friendly features that make them the preferred choice for professional engine builders. All ring materials, coatings, and tensions are optimized for each specific application to ensure maximum durability and performance.