What is the compression ratio with these pistons?

These Mahle pistons feature a -8cc dish volume. When paired with the appropriate cylinder head volume for a Big Block Ford 544ci engine, this configuration results in an 11.1:1 compression ratio, suitable for many performance applications.

What material are these pistons made from and why is it important?

The pistons are made from 4032 aluminum. This alloy is chosen for its strength to withstand high combustion pressures and temperatures, while also offering good thermal expansion characteristics that allow for tighter piston-to-wall clearances and reduced noise.

Are these pistons compatible with all Big Block Ford engines?

This specific set is designed for the 544 cubic inch displacement and is intended for use with Kaase Boss Nine cylinder heads. While it fits Ford Big Block 521 cu in. engines, it's important to confirm that the bore, stroke, rod length, and compression ratio align with your specific engine build plans.

Mahle BBF 544ci Piston Set 4.390in Bore 930022790

Name: Mahle MS Piston Set BBF 544ci 4.390in Bore 4.5in Stroke 6.7in Rod 0.990 Pin -8cc 11.1 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bbf-544ci-4-390in-bore-4-5in-stroke-6-7in-rod-0-990-pi-t14-191465
Price: 879.27 USD
Availability: BackOrder

Mahle MS Piston Set BBF 544ci 4.390in Bore 4.5in Stroke 6.7in Rod 0.990 Pin -8cc 11.1 CR Set of 8

$879.27

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle MS Piston Set for BBF 544ci engines. Features a 4.390in bore and 11.1 CR for improved performance.

Key Features

Fits Ford Big Block 521 cu in. engines.
Designed for Kaase Boss Nine cylinder heads.
4.390 inch bore size.
4.5 inch stroke compatibility.
6.7 inch connecting rod length.
0.990 inch pin diameter.

This piston set is designed for Ford Big Block 521 cu in. engines, particularly those utilizing Kaase Boss Nine cylinder heads. Please verify compatibility with your specific engine build.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

If you're building a high-performance Ford Big Block engine, especially one using Kaase Boss Nine cylinder heads, a solid set of pistons is crucial. This Mahle MS Piston Set is built for the 544 cubic inch displacement, featuring a 4.390-inch bore and a 4.5-inch stroke, designed to work with a 6.7-inch connecting rod. These pistons are crafted from 4032 aluminum, a material known for its strength and ability to handle the heat and stress of powerful engines, while also offering good thermal expansion properties for a tighter piston-to-wall clearance. The -8cc dish volume combined with the specific cylinder head volume results in an 11.1:1 compression ratio, which is a popular choice for naturally aspirated performance builds seeking a good balance of power and pump gas compatibility.

This set includes eight pistons, each weighing approximately 602 grams, ensuring consistency across all cylinders. The 0.990-inch pin diameter is standard for many performance applications, and these pistons are designed to fit right into your Big Block Ford build. Mahle is a well-known name in engine components, and this set reflects their commitment to producing reliable parts for demanding engine builds. Remember that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper assembly and break-in procedures to ensure the longevity of your new engine.