Mahle 40723CP Engine Piston Ring Set

Mahle 40723CP Piston Ring Set Overview

The Mahle 40723CP engine piston ring set is built for precision sealing, controlled oil management, and reduced friction in performance and repair applications. It is a premium engine piston ring set with a 4.250 in bore diameter, standard oversize, and plasma-moly face coating for durable cylinder wall contact.

Compatible With select engine rebuilds where Mahle piston rings are specified, including Chevrolet and GMC V8 applications that use a 4.250-inch bore. The 40723CP is engineered to support consistent compression control and oil control in demanding street and service use.

Key Features

• Mahle premium engine piston ring set, part number 40723CP
• 4.250 in bore diameter with standard oversize
• Plasma-moly piston ring face coating for wear resistance
• Top ring material: ductile iron
• Second ring material: cast iron
• Oil ring assembly material: stainless steel
• Top ring thickness: 0.0938 in
• Second ring thickness: 0.0781 in
• Oil ring assembly thickness: 0.1875 in

Detailed Description

Mahle 40723CP piston rings are designed around OE-driven engineering priorities: low friction, controlled oil consumption, and long service life. The ductile iron top ring, cast iron second ring, and stainless steel oil ring assembly work together to maintain cylinder sealing and oil control under heat and load. The plasma-moly face coating adds a durable contact surface for engine rebuilds that require stable ring performance. If you are sourcing Mahle 40723CP for a Chevrolet or GMC engine rebuild, this ring set provides the dimensional and material specifications needed for a precise rebuild.

This part cross-references Hastings Piston Rings (e.g., 2M6606, PEM6606) for the same application.

Common Uses

• Restoring compression loss caused by worn piston rings
• Reducing excessive oil consumption from ring wear
• Addressing blow-by and crankcase pressure issues
• Supporting cylinder sealing during a Chevrolet or GMC engine rebuild
• Replacing worn rings in a 4.250-inch bore engine

Installation Notes and Tips

Verify bore diameter, ring groove dimensions, and end gap before assembly. Clean the piston ring grooves thoroughly and inspect cylinder wall condition before installing the Mahle 40723CP ring set. Follow the engine builder’s ring gap and break-in procedures for the specific Chevrolet or GMC application, and confirm that the ring package matches the intended cylinder finish and rebuild specification.

Quality Assurance

Mahle piston rings are developed to meet OE-level engineering expectations for friction control, oil management, and service life. The 40723CP reflects Mahle’s focus on precision materials and ring design for engine rebuild applications.