What is the compression ratio with these pistons?

These JE Pistons are designed to achieve a 9.5:1 compression ratio. This is a common target for many performance builds, offering a good balance of power and drivability.

What material are these pistons made from?

They are forged from 2618 aluminum. This material is chosen for its high tensile strength, which is essential for handling the high stresses and temperatures found in performance engines.

Are these pistons compatible with all 350/400 small-block Chevy engines?

These pistons are specifically designed for a 4.030 inch bore. You will need to ensure your engine block has been machined to this bore size for proper fitment. They are not CARB approved and cannot be shipped to California.

JE Pistons 350/400 SBC Forged Piston Set 173581

Name: JE Pistons 350/400 SBC 9.5:1 GP Set of 8 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-350-400-sbc-9-5-1-gp-set-of-8-pistons-t14-295217
Price: 1129.82 USD
Availability: BackOrder

JE Pistons 350/400 SBC 9.5:1 GP Set of 8 Pistons

$1129.82

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 350/400 SBC 9.5:1 GP Set of 8 Pistons. Forged in the USA from 2618 aluminum for high-demand performance.

Key Features

Fits 350/400 small-block Chevy engines with a 4.030 inch bore.
Provides a 9.5:1 compression ratio.
Forged in the USA using 2618 aluminum for high tensile strength.
Features JE Pistons' proprietary Forged Side Relief (FSR) design to minimize friction and weight.
Includes a 0.927 inch wrist pin diameter.
May include an accumulator groove to reduce ring flutter and improve ring seal.

These pistons are designed for 350/400 small-block Chevy engines with a 4.030 inch bore. They are not CARB approved and cannot be shipped to California.

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Product Details

If you're building a high-performance 350 or 400 small-block Chevy, these JE Pistons are a solid choice for your engine. They're designed to handle the demands of serious performance builds, offering a 9.5:1 compression ratio with a 4.030-inch bore. JE Pistons has been making forged pistons for over 75 years, and these are forged and machined entirely in the USA.

What sets these pistons apart is their construction and design features. They're made from 2618 aluminum, which gives them the high tensile strength needed for demanding applications. You'll find JE's proprietary Forged Side Relief (FSR) forging design, which helps minimize friction and power loss by reducing skirt width. This design also saves weight by using a shorter wrist pin. 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. Some applications also feature a skirt coating that reduces friction and wear on the piston skirts and cylinder walls, leading to quieter operation.

This set includes eight pistons, each designed specifically for the 350/400 SBC engine to optimize performance and durability. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. They are designed for competition use and are a key component for anyone looking to get the most out of their engine build.