What does the .020 undersize mean for my engine build?

The .020 undersize designation means these pistons are designed to fit into an engine cylinder that has been bored out by 0.020 inches larger than its original factory diameter. This is a common practice during engine rebuilding to clean up cylinder walls or achieve a specific displacement.

Do these pistons come with everything needed for installation?

Yes, this set includes the eight pistons, the piston rings already mounted on each piston, and the necessary wrist pins and clips. This makes them a convenient, ready-to-install package for your engine rebuild.

Are these pistons suitable for a performance build?

These are Mahle OE quality cast pistons, designed to meet original equipment specifications for reliability and durability. While excellent for a stock rebuild or mild performance application, for extreme high-performance builds, forged pistons might be considered.

Mahle OE Piston Set .020 2242040020 - Ford 351W 5.8L 1977-19

Name: Mahle OE Ford Pass& Trk 351W 5.8L Eng 1977-92 .020 Piston Set (Set of 8)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-ford-pass-trk-351w-5-8l-eng-1977-92-020-piston-set-set-of-8-t14-53436
Price: 168.78 USD
Availability: BackOrder

Mahle OE Ford Pass& Trk 351W 5.8L Eng 1977-92 .020 Piston Set (Set of 8)

$168.78

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 cast piston set for Ford 351W 5.8L engines (1977-1992). .020 undersize. Includes rings, pin, and clips.

Key Features

Fits 1977-1992 Ford and Mercury vehicles with 351W 5.8L engines, including popular models like the Ford F-150, Bronco, and E-Series vans.
This is a .020 inch undersize piston set, designed for engine blocks that have been bored out to this specific measurement.
Mahle OE quality pistons feature compensated ring grooves for proper ring loading and oil control.
Expansion controlled design reduces engine noise and wear by maintaining small fitting clearances.
Pistons come with mounted piston rings, wrist pins, and clips for a convenient, ready-to-install package.
Set includes eight pistons, enough for a complete V8 engine rebuild.

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Will this fit your vehicle?

Product Details

If you're rebuilding the engine in your 1977-1992 Ford truck or full-size car with a 351W 5.8L engine, a solid set of pistons is key. These Mahle OE cast pistons are made to fit right and perform reliably, just like the original equipment. They come ready to install, with the piston rings already mounted, and include the wrist pins and clips you'll need to get the job done.

Mahle is a major OE piston manufacturer, so you know these pistons are built with the right features. They have compensated ring grooves to ensure the rings seal properly and control oil, and an expansion-controlled design that helps reduce engine noise and wear by maintaining small, consistent clearances. This means a smoother running engine with improved oil control and lower emissions.

This set is specifically for a .020 inch undersize bore, so make sure your cylinders have been machined to match this size. You'll get a full set of eight pistons, along with all the necessary rings, pins, and clips for a complete engine build.