What does '.040 undersize' mean for these pistons?

'.040 undersize' means these pistons are manufactured to be 0.040 inches smaller in diameter than the standard bore size for the specified engines. This is typically used when an engine's cylinders have been bored out during a rebuild to clean up wear or damage.

Do these pistons come with everything needed for installation?

Yes, this set includes the pistons, the correct piston rings, wrist pins, and clips, all pre-mounted and ready for installation. This convenience saves you time and ensures compatibility between the components.

Are these pistons suitable for high-performance builds?

These are OE quality cast pistons designed to meet original equipment specifications for durability and proper engine function. While they are well-built for standard operation, for extreme high-performance applications, forged pistons are often recommended.

Mahle OE Piston Set .040 2242108040 - Ford 289/302 Engines

Name: Mahle OE Ford Pass & Trk 289 Eng 1963-68 302 Eng 1977-85 .040 Piston Set (Set of 8)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-ford-pass-trk-289-eng-1963-68-302-eng-1977-85-040-piston-set-s-t14-53176
Price: 158.66 USD
Availability: BackOrder

Mahle OE Ford Pass & Trk 289 Eng 1963-68 302 Eng 1977-85 .040 Piston Set (Set of 8)

$158.66

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 289 (1963-68) and 302 (1977-85) engines. .040 undersize. Includes rings, pin, and clips.

Key Features

Fits Ford Bronco, Country Sedan, Country Squire, E-Series vans, F-Series trucks, Fairlane, Falcon, Galaxie, Granada, LTD, Maverick, Mustang, Ranchero, Thunderbird, and Mercury vehicles with 289 (1963-68) or 302 (1977-85) engines.
This is a set of eight cast pistons, .040 inch undersize for engine rebuilding.
Features expansion-controlled designs to reduce engine noise and wear.
Compensated ring grooves ensure proper ring loading and oil control.
Includes mounted piston rings, pin, and clips for easier installation.
OE quality construction from Mahle, a leading original equipment piston manufacturer.

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Will this fit your vehicle?

Product Details

Mahle is one of the largest original equipment piston manufacturers globally, known for making parts that meet the exact specifications of the vehicles they're made for. This set of eight cast pistons is built to OE quality standards for a range of Ford and Mercury vehicles equipped with the 289 engine from 1963-1968 or the 302 engine from 1977-1985. These pistons are .040 inch undersize, meaning they are slightly smaller than the standard bore size, which is common when rebuilding an engine that has been bored out.

These pistons feature expansion-controlled designs to help reduce engine noise and wear by maintaining small fitting clearances. They also come with compensated ring grooves, which are crucial for ensuring proper ring loading and effective oil control. For your convenience, Mahle includes the piston rings, pins, and clips already mounted, so they're ready for installation right out of the box. This makes the rebuilding process smoother, helping to reduce emissions and improve overall oil control for your engine.