Mahle 40564CP.030 Engine Piston Ring Set

Engine Piston Ring Set Overview

MAHLE 40564CP.030 is a premium oversize piston ring set built for 4.030-inch bore applications with a 0.030-inch oversize specification. It uses a plasma-moly face coating, carbon steel top ring, cast iron second ring, and stainless steel oil ring assembly for a technical OE-style repair solution.

Compatible with a wide range of Chevrolet, Ford, and GMC V8 applications, this piston ring set is a fitment-based choice for engine rebuilds that require precise ring sizing and material selection. The MAHLE 40564CP.030 part number is also referenced in interchange listings for Hastings 2M139030 and Sealed Power E251K30.

Key Features

• 4.030-inch bore diameter with 0.030-inch oversize sizing
• Plasma-moly ring face coating for reduced friction at the cylinder wall
• Carbon steel top ring for strength and wear resistance
• Cast iron second ring and stainless steel oil ring assembly
• Premium grade construction for rebuild-focused engine service

Detailed Application Notes

MAHLE piston rings are engineered around OE requirements, with an emphasis on lowering friction, reducing ring mass, controlling oil consumption, and supporting longer service life. The 40564CP.030 ring set is suited to rebuilds where correct bore size and ring material selection are critical to sealing performance. This part number, 40564CP.030, is commonly searched for classic truck and performance engine rebuilds, including Chevrolet Camaro, Ford F-250, and GMC C/K-series applications.

What This Part Helps Address

• Excessive oil consumption from worn or incorrect rings
• Loss of cylinder sealing and reduced compression
• High friction from aged or damaged ring surfaces
• Ring wear during engine overhaul or rebuild work
• Fitment issues when an oversize 0.030-inch ring set is required

Installation Notes and Tips

Verify bore diameter, piston groove dimensions, and ring end gap before assembly. This set is intended for engines that have been machined for a 0.030-inch oversize application, so confirm cylinder measurements during the rebuild process. Follow the engine builder’s ring orientation, gap placement, and break-in procedures for the specific application.

Quality Assurance

MAHLE positions this piston ring line around OE-driven engineering and advanced ring technology. The 40564CP.030 part number reflects a premium rebuild component designed for precise fitment and consistent sealing performance in supported applications.