MAHLE 3150032-035 Plasma-Moly Piston Ring Set 4.155 in Bore File Fit 8-Cylinder

The MAHLE 3150032-035 is a precision-ground, plasma-moly piston ring set engineered for high-performance 8-cylinder engines. Designed for a 4.155-inch bore with a +0.035-inch oversize, this file-fit ring set delivers the combustion sealing, oil control, and durability demanded by serious performance builds and engine rebuilds alike.

Key Features:

• Plasma-moly top ring: Ductile iron construction with plasma-moly inlay for superior scuff resistance, faster break-in, and extended service life under high heat and pressure
• Barrel-faced top ring profile: Promotes instant cylinder wall contact at TDC and BDC as the piston rocks, ensuring consistent sealing from the first start
• Napier THG (Tapered Hook Groove) second ring: Acts as a check valve to relieve combustion pressure buildup beneath the top ring while delivering exceptional oil scraping and cylinder wall control on each downstroke
• CP-20 oil control ring: MAHLE's exclusive 20-degree ear angle design provides maximum cylinder wall conformability and oil sealing performance
• 3-piece oil ring assembly: Stainless steel expander between two chrome-faced steel rails for high conformability within the bore
• File-fit design: Allows builders to custom-fit end gaps to exact specifications for their application
• Ring thicknesses: 1/16 in. (top) x 1/16 in. (second) x 3/16 in. (oil) — standard tension
• Engineered for foolproof installation: Ring orientation design prevents incorrect assembly

MAHLE is the world's largest piston ring manufacturer, with over 60% of North American production engines utilizing MAHLE pistons or rings. The 3150032-035 ring set is sold as a complete set for one 8-cylinder engine and is built to OE-quality standards with premium materials. Ideal for performance rebuilds, overhauls, or re-ring projects requiring a proven, high-quality plasma-moly ring package.