What is the compression ratio of these pistons?

These JE Pistons feature an 8.5:1 compression ratio. This is a common ratio for performance builds, especially those using forced induction like superchargers or turbochargers.

Are these pistons suitable for a daily driver or just a race car?

While designed with performance in mind, the materials and features like skirt coating (if applicable to this specific application) help reduce friction and noise, making them a solid option for high-demand street or track use. They are built for durability under stress.

What does the 'FSR' forging design mean?

FSR stands for Forged Side Relief. This design helps minimize friction and power loss by reducing the piston skirt width. It also contributes to saving weight and improving overall engine efficiency.

JE Pistons 5.4 4V Modular 8.5:1 Piston Set 314688

Name: JE Pistons 5.4 4V MODULAR 8.5:1 Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-5-4-4v-modular-8-5-1-set-of-8-pistons-t14-296569
Price: 950.07 USD
Availability: BackOrder

JE Pistons 5.4 4V MODULAR 8.5:1 Set of 8 Pistons

$950.07

On Backorder

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

JE Pistons 5.4 4V MODULAR 8.5:1 Set of 8 Pistons. Forged from 2618 aluminum for high-demand performance.

Key Features

Fits 5.4L 4V Modular 8-cylinder engines.
Set includes eight forged pistons.
8.5:1 compression ratio.
Forged in the USA from 2618 aluminum for high tensile strength.
Features proprietary Forged Side Relief (FSR) design to minimize friction and reduce skirt width.
Includes a 3.562-inch bore size.

This piston set is designed for 5.4L 4V Modular 8-cylinder engines. Please verify compatibility with your specific engine configuration.

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Product Details

If you're rebuilding the engine in your 5.4L 4V Modular, choosing the right pistons is crucial for performance and durability. This set of eight pistons from JE Pistons is designed to handle the demands of a high-performance build, offering a robust 8.5:1 compression ratio that's ideal for forced induction or high-octane naturally aspirated applications.

JE Pistons has been a leader in forged racing pistons for over 75 years, and this set reflects that experience. They're forged in the USA using 2618 aluminum, a material known for its high tensile strength, which is exactly what you need when pushing an engine hard. The design includes their proprietary Forged Side Relief (FSR) forging, which helps minimize friction and reduce skirt width, saving weight and improving efficiency. Depending on the specific application, these pistons may also feature an accumulator groove to reduce combustion gas pressure, leading to better ring seal and consistent power, and a skirt coating to further reduce friction and wear while quieting down operation.

This kit includes everything needed for a complete set of eight pistons, each with a 3.562-inch bore and a -28.2cc dish volume. They are designed specifically for the 5.4L 4V Modular engine, ensuring an optimized fit and performance. Please note that these pistons are not CARB approved and cannot be shipped to California.