What is the purpose of the Forged Side Relief (FSR) design?

The FSR forging design is intended to minimize friction and power loss. It achieves this by reducing the piston skirt width and utilizing a shorter wrist pin, which also helps to save weight.

Are these pistons suitable for all 400 SBC engine builds?

These pistons are designed for 400 Small Block Chevy engines with a 4.155 inch bore and a -5.0cc dish. While they are built for high-demand performance, always verify compatibility with your specific engine configuration and build goals.

What does it mean that these pistons are not CARB approved?

Not being CARB approved means these pistons do not meet the emissions standards set by the California Air Resources Board. Consequently, they cannot be legally shipped to or installed in California.

JE Pistons 400 SBC Flat Top Piston Set 181940

Name: JE Pistons 400 SBC FLAT TOP Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-400-sbc-flat-top-set-of-8-pistons-t14-295258
Price: 1001.43 USD
Availability: BackOrder

JE Pistons 400 SBC FLAT TOP Set of 8 Pistons

$1001.43

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 400 SBC Flat Top Set of 8 Pistons. Forged in the USA from 2618 aluminum for high-demand performance.

Key Features

Fits 400 Small Block Chevy engines with a 4.155 inch bore.
Set includes eight flat-top pistons with a -5.0cc dish volume.
Forged in the USA using 2618 aluminum for high tensile strength.
Features a proprietary Forged Side Relief (FSR) design to minimize friction and power loss.
Includes a 0.927 inch pin diameter.
May include an accumulator groove to reduce combustion gas pressure and improve ring seal.

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Product Details

Forged from 2618 aluminum, these JE Pistons are built for high-demand performance applications. This set includes eight flat-top pistons designed specifically for the 400 Small Block Chevy engine, featuring a 4.155-inch bore and a -5.0cc dish volume. The proprietary Forged Side Relief (FSR) forging design is a key feature, working to minimize friction and power loss by reducing skirt width and saving weight with a shorter wrist pin. This thoughtful design contributes to overall engine efficiency and durability under stress.

JE Pistons brings over 75 years of experience to their manufacturing, with these pistons being engineered, forged, and machined entirely in the USA. This commitment to domestic production ensures a high level of quality control and access to the materials needed for robust performance. Depending on the specific application, these pistons may also include an accumulator groove to help reduce combustion gas pressure, which can prevent ring flutter and improve ring seal for more consistent power delivery. Additionally, a skirt coating, if included for your application, further reduces friction and wear on the piston skirts and cylinder walls, contributing to quieter operation and extended component life.

This piston set is a solid option for builders looking for proven performance and durability in their 400 SBC build. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.