What does the .040 sizing mean for these pistons?

The .040 sizing indicates that these pistons are 0.040 inches larger in diameter than the standard factory size. This is common when rebuilding an engine that has had previous wear on the cylinder walls, allowing for a fresh bore to be cut to match the piston size.

Are the piston rings included with this set?

Yes, these Mahle OE pistons come with the piston rings already mounted. The manufacturer description also states that the piston pin and clips are included and mounted for convenience.

What is the benefit of compensated ring grooves?

Compensated ring grooves help ensure that the piston rings maintain proper loading against the cylinder wall. This leads to better oil control, reduced emissions, and improved overall engine performance.

Mahle OE Piston Set .040 2242694040

Name: Mahle OE GM 350 Same as 2243556 (Except 8 Pack) .040 Piston Set (Set of 8)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-gm-350-same-as-2243556-except-8-pack-040-piston-set-set-of-8-t14-53405
Price: 137.00 USD
Availability: BackOrder

Mahle OE GM 350 Same as 2243556 (Except 8 Pack) .040 Piston Set (Set of 8)

$137.00

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 GM 350 .040 Piston Set (8 Pack). Fits many vehicles with 8-cylinder engines.

Key Features

Fits 149+ vehicle make/model combinations.
Mahle OE quality pistons designed for GM 350 engines.
Pistons are .040 inch oversize for worn cylinders.
Expansion-controlled design reduces engine noise and wear.
Compensated ring grooves improve oil control and emissions.
Includes 8 pistons with pin and clips mounted for easy installation.

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Will this fit your vehicle?

Product Details

If you're rebuilding the engine in your classic GM vehicle, a quality piston set is crucial for performance and longevity. This Mahle OE piston set is designed for GM 350 cubic inch engines and comes in a .040 inch oversize to help restore compression in worn cylinders. Mahle is a well-known OE supplier, meaning these pistons meet the same standards as the original parts installed at the factory.

These pistons feature expansion-controlled designs, which help reduce engine noise and wear by maintaining proper clearances as the engine heats up. The compensated ring grooves ensure the piston rings seat correctly, improving oil control and reducing emissions. This set includes eight pistons, ready for installation with the piston pin and clips already mounted, saving you time and effort during your rebuild.

This piston set fits a wide range of GM vehicles from the 1970s through the 1990s, including many Chevrolet C/K series trucks, Caprice models, and Buick Roadmaster sedans. Always check the full fitment guide to confirm compatibility with your specific vehicle.