What is the compression ratio of these pistons?

These JE Pistons feature a 9.5:1 compression ratio. This is a common ratio for performance builds that aim for increased power while maintaining reasonable drivability.

Are these pistons suitable for a street-driven vehicle?

While these pistons are built for high-demand performance applications, features like the skirt coating and accumulator groove (depending on application) help reduce friction, wear, and noise, making them a viable option for street use in a performance-oriented build.

What does the Forged Side Relief (FSR) design do?

The FSR design minimizes friction and power loss by reducing the piston skirt width. It also contributes to saving weight by utilizing a shorter wrist pin.

JE Pistons 5.4 4V Modular Piston Set 314696

Name: JE Pistons 5.4 4V MODULAR 9.5:1 Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-5-4-4v-modular-9-5-1-set-of-8-pistons-t14-296577
Price: 950.07 USD
Availability: BackOrder

JE Pistons 5.4 4V MODULAR 9.5:1 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 9.5:1 Set of 8 Pistons

Key Features

Fits 5.4L 4V Modular engines.
Set includes eight forged pistons with a 9.5:1 compression ratio.
Forged in the USA from 2618 aluminum for high tensile strength.
Features proprietary Forged Side Relief (FSR) forging design to minimize friction and power loss.
Includes an accumulator groove (depending on application) to reduce combustion gas pressure and improve ring seal.
Skirt coating (depending on application) reduces friction and wear while quieting operation.

This piston set is designed for 5.4L 4V Modular engines. Please verify compatibility with your specific vehicle's engine configuration.

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Product Details

If you're rebuilding the engine in your 5.4L 4V Modular Ford, choosing the right pistons is crucial for performance and reliability. This set of eight pistons from JE Pistons is built for demanding applications where strength and durability are paramount. They feature a 9.5:1 compression ratio, making them a solid choice for builds aiming for increased power without sacrificing too much drivability.

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 from 2618 aluminum, a material known for its high tensile strength, which is exactly what you need when pushing an engine hard. The design includes a proprietary Forged Side Relief (FSR) forging, which helps minimize friction and power loss by reducing skirt width, and also saves weight with a shorter wrist pin. Some applications also benefit from an accumulator groove to reduce combustion gas pressure, improving ring seal and keeping power consistent. A skirt coating, if included for your specific application, further reduces friction and wear on the cylinder walls, while also helping to quiet down the engine.

This piston kit is designed specifically for the 5.4L 4V Modular engine, ensuring an optimized fit and performance. The bore size is 3.701 inches, with a compression distance of 1.320 inches and a wrist pin diameter of 0.866 inches. Please note that these pistons are not CARB approved and cannot be shipped to California. They are designed for high-demand performance applications and are made 100% in the USA.