What does '0.040 inch undersize' mean for these piston rings?

This means the rings are sized to fit pistons that have been machined to be 0.040 inches larger in diameter than their original size. This is common when an engine block is bored out during a rebuild to clean up cylinder walls or increase displacement.

Are these rings suitable for a standard bore engine?

No, these rings are specifically 0.040 inch undersize. They are intended for engines where the cylinders have been bored out to accommodate pistons that are 0.040 inches larger in diameter than the original factory size.

What is the benefit of Mahle OE piston rings?

Mahle OE rings are designed to meet original equipment standards, focusing on reducing friction, minimizing oil consumption, and providing a longer service life for your engine.

Mahle OE Piston Rings 50618.040 - 5.0L V8

Name: Mahle Rings JEEP 5.0L 49-81 Plain Ring Set
Brand: Mahle OE
Price: 124.38 USD
Availability: InStock

Mahle Rings JEEP 5.0L 49-81 Plain Ring Set

$124.38

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle OE 50618.040 piston rings for 5.0L V8 engines. These 0.040 inch undersize rings minimize oil consumption and friction.

Key Features

Fits 5.0L V8 engines across a wide range of American Motors, Buick, Chevrolet, Ford, Jeep, and Mercury vehicles.
These are 0.040 inch undersize piston rings, intended for engines bored to that specific measurement.
Designed to reduce friction and minimize engine oil consumption.
Built to meet original equipment requirements for durability and performance.
Mahle OE rings are known for their advanced technology in piston ring design.

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Will this fit your vehicle?

Product Details

These Mahle OE piston rings are 0.040 inch undersize, meaning they are designed to fit pistons that have been bored out by 0.040 inches during an engine rebuild. Mahle is known for making technically advanced rings that meet original equipment requirements, focusing on reducing friction and minimizing oil consumption. This attention to detail helps ensure a longer service life for your engine components.

When you're rebuilding an engine, especially for a classic American vehicle like a Jeep CJ, a Chevrolet Bel Air, or a Ford Fairlane, the piston rings are a critical part of getting the seals right. These Mahle rings are built to help achieve that proper seal, which is essential for maintaining good compression and preventing oil from getting into the combustion chamber. Their design aims to reduce the drag inside the cylinder, which can lead to improved efficiency and a smoother running engine.

This set is designed for a wide range of vehicles from the 1950s through the early 1980s. It's always a good idea to double-check your specific engine bore size before ordering, especially if you're not the one who bored the cylinders. If your engine has been bored to 0.040 inches over, this set should fit right in.