MAHLE 42066CP Premium Piston Ring Set Bore - LS3/LSA/LS9/L92 4.065

The MAHLE 42066CP Premium Piston Ring Set is engineered for GM LS3, LSA, LS9, and L92 engines with a 4.065-inch bore diameter. This professional-grade ring set features advanced materials and precision engineering to deliver optimal performance and durability in demanding applications.

Ring Specifications:

• Top ring: 1.5mm height, 0.155" radial width, barrel-faced with plasma-moly coating
• Second ring: 1.2mm height, 0.174" radial width, reverse twist design
• Oil control ring: 2.0mm height, 0.114" radial width, CP-20 assembly

Key Features:

• Pre-lapped rings seat immediately, virtually eliminating break-in time
• Barrel-faced compression rings with CNC-controlled gap chamfer optimize compression and reduce blowby
• Reverse twist intermediate rings provide superior groove side sealing with taper race machining
• CP-20 oil ring assemblies feature exclusive 20-degree ear angle for optimal cylinder wall sealing
• Special chemical polish on oil ring expander enhances oil drainback
• Optimized ring materials, coatings, and tension minimize friction and extend service life

MAHLE Original piston ring sets are designed for installer-friendly installation and deliver unmatched quality, making them the preferred choice for professional engine builders and performance enthusiasts.