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

This means the rings are made to fit cylinders that have been bored out by 0.040 inches larger than their original factory size. This is common during engine rebuilds when cylinders need to be reconditioned.

Are these rings suitable for a performance build?

Mahle piston rings are known for their advanced technology, focusing on reducing friction and oil consumption. While they meet OE requirements, their design can also benefit performance builds by improving efficiency.

What is the typical application for this type of piston ring set?

These rings are typically used during an engine rebuild or overhaul. They are essential for restoring proper compression, controlling oil consumption, and ensuring the longevity of engines in classic Buick, Oldsmobile, and Pontiac vehicles.

Mahle OE Piston Rings 50784CP.040 - Buick, Olds, Pontiac

Name: Mahle Rings Buick 400 Eng 1978 Olds 400 Eng 1975 Pontiac 428 Eng 67-82 Plain Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-buick-400-eng-1978-olds-400-eng-1975-pontiac-428-eng-67-82--t14-50616
Price: 129.22 USD
Availability: BackOrder

Mahle Rings Buick 400 Eng 1978 Olds 400 Eng 1975 Pontiac 428 Eng 67-82 Plain Ring Set

$129.22

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 piston rings for Buick, Olds, and Pontiac V8 engines. These 0.040 inch undersize rings help reduce friction and oil consumption.

Key Features

Fits 1978 Buick 400, 1975 Oldsmobile 400, and 1967-1982 Pontiac 428 engines.
This is a 0.040 inch undersize piston ring set.
Designed to reduce friction and minimize engine oil consumption.
Mahle OE rings are built to meet original equipment requirements.
Helps to provide a longer service life for your engine.
Features the latest piston ring technology from Mahle.

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Will this fit your vehicle?

Product Details

Mahle is known for making technically advanced engine components, and these piston rings are a great example. If you're rebuilding the engine in your classic Buick, Oldsmobile, or Pontiac, these rings are designed to meet the demands of OE requirements. They work to minimize oil consumption and reduce friction, which can help extend the life of your engine.

This set is specifically sized at 0.040 inch undersize, meaning it's intended for engines where the cylinders have been bored out to that dimension. Mahle focuses on the latest piston ring technology, aiming to reduce ring mass and friction without sacrificing performance. This attention to detail means you're getting a well-built set that's ready to go into your project.

This set fits a wide range of vehicles, including popular models like the Pontiac Firebird, Grand Prix, and Oldsmobile Delta 88 from the late 60s through the late 70s. Make sure to check the full fitment list to confirm compatibility with your specific application.