What does the 0.040 in the part number mean?

The '0.040' in the part number 40906.040 indicates that these piston rings are 0.040 inches oversize. This means they are intended for use in engine cylinders that have been bored out to match this larger size during a rebuild.

Why is a chrome face important for piston rings?

A chrome face on piston rings helps them resist wear much better than standard cast iron. This increased durability means the rings can last longer in the engine, maintaining a good seal against the cylinder wall and contributing to overall engine health.

What is the benefit of reduced oil consumption?

Reducing oil consumption means less oil is burned during combustion. This helps keep your exhaust emissions cleaner, prevents excessive carbon buildup in the engine, and means you won't have to top off your oil as frequently.

Mahle OE Piston Rings 40906.040 - Ford 359/361/389/391 Engin

Name: Mahle Rings Ford Trk 359/361/389/391 Engs 70-75 Chrome Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-ford-trk-359-361-389-391-engs-70-75-chrome-ring-set-t14-49630
Price: 125.90 USD
Availability: BackOrder

Mahle Rings Ford Trk 359/361/389/391 Engs 70-75 Chrome Ring Set

$125.90

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 chrome piston ring set for Ford 359, 361, 389, and 391 engines. Reduces friction and oil consumption for longer engine life.

Key Features

Fits Ford F-100 (1970-1974), F-250 (1970-1974), F-350 (1970-1974), M-400 (1971, 1973), M-450 (1974), and P-350 (1972-1973) with 359, 361, 389, and 391 cubic inch engines.
Features a chrome face for improved wear resistance and extended service life.
Designed to reduce internal engine friction, contributing to improved efficiency.
Minimizes engine oil consumption for cleaner operation and stable oil levels.
Built to meet original equipment manufacturer requirements.
This set is 0.040 inch oversize.

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Will this fit your vehicle?

Product Details

These Mahle OE piston rings are made with a chrome face, a design choice that helps them resist wear and last longer in your engine. They're built to meet the demanding requirements of original equipment manufacturers, focusing on reducing internal friction and minimizing how much oil your engine burns. This set is designed for Ford truck engines like the 359, 361, 389, and 391, commonly found in vehicles from the early to mid-1970s.

When you're rebuilding or refreshing an engine, getting the piston rings right is crucial for performance and longevity. Mahle's approach aims to improve efficiency by lowering friction, which can also contribute to better fuel economy. They also focus on minimizing oil consumption, a common issue in older engines, helping to keep your exhaust cleaner and your oil levels more stable. This means you get a well-built set that contributes to a healthier, longer-running engine.

This set fits a range of Ford trucks from the early 1970s, including models like the F-100, F-250, and F-350. Remember that these rings are not CARB approved and cannot be shipped to California.