JE PISTONS 398730 Piston Kit 193564567390 4.250-INCH 4.375-INCH 11.5

( Brand: Je Pistons ), ( Manufacturer Part Number: 398730 ), ( Part Type: Piston ), ( UPC: 193564567390 )

Review JE PISTONS Piston Kit Fits 4.250-inch Bore 4.375-inch Stroke 11.5

The JE Pistons 398730 piston kit is a high-performance solution designed for engines with a bore size ranging from 4.250 inches to 4.375 inches and a stroke length of 11.5 inches. This piston kit is an excellent choice for engine builders and racers seeking superior power and reliability.

Each piston in this kit is meticulously crafted using JE's proprietary forged 2618-T6 aluminum alloy. This material ensures exceptional strength and durability while keeping the weight to a minimum. The piston skirts feature an enhanced design to reduce friction and promote superior ring seal.

The piston crowns are optimized for maximum power output, with a unique dome shape that increases compression height and area. This design allows for increased power output and improved engine efficiency. The piston tops are also CNC machined for precision and feature a dish design that enhances the piston's ability to transfer power to the crankshaft.

The piston rings included in this kit are made of high-quality materials that ensure a tight seal and long-lasting performance. The piston rings are also designed to work in conjunction with the piston's unique shape, ensuring optimal sealing and engine performance.

Additionally, this piston kit includes JE's patented Wristpin Boss Technology, which provides increased strength and durability to the wristpin area. This technology is crucial for high-performance applications where increased power output can put additional stress on the piston.

The JE Pistons 398730 piston kit is designed to work in conjunction with a variety of engine configurations and fuels, making it a versatile solution for engine builders and racers. With its exceptional strength, durability, and performance, this piston kit is an excellent investment for anyone seeking to build a high-performance engine.

Pros and Cons of Buying Je Pistons 398730 Piston Kit (4.250-inch, 4.375-inch, 11.5)

* This piston kit from Je Pistons is specifically designed for 4.2L and 4.3L Ford engines, ensuring a precise fit and optimal performance.

* The pistons are made from forged aluminum, which is known for its strength and durability. This material can handle high compression ratios and extreme engine temperatures.

* The piston kit includes connecting rods and piston rings, making it a complete solution for engine rebuilds or upgrades.

* The pistons come with a factory-installed coating that reduces friction and improves engine efficiency.

* Je Pistons is a reputable brand in the automotive industry, known for producing high-quality pistons and other engine components.

* The Je Pistons 398730 piston kit may be more expensive than some aftermarket alternatives. However, the cost is justified by the quality and performance benefits.

* The installation process can be complex, especially for those without mechanical experience. It is recommended to have the kit installed by a professional mechanic.

* Depending on the specific engine configuration, additional modifications may be required to achieve optimal performance with this piston kit.

The Je Pistons 398730 piston kit (4.250-inch, 4.375-inch, 11.5) offers several advantages for those seeking high-performance engine components. Its forged aluminum construction, factory-installed coating, and inclusion of connecting rods and piston rings make it a comprehensive solution for engine upgrades or rebuilds. While the cost may be higher than some alternatives, the quality and benefits provided by Je Pistons make it a worthwhile investment for those seeking optimal engine performance and durability.

If you are looking for a high-quality piston kit for your 4.2L or 4.3L Ford engine, the Je Pistons 398730 piston kit is an excellent choice. Its forged aluminum construction, factory-installed coating, and inclusion of connecting rods and piston rings make it a reliable and efficient option for engine upgrades or rebuilds. While the cost may be higher than some alternatives, the quality and performance benefits provided by Je Pistons make it a worthwhile investment for those seeking optimal engine performance and durability. It is recommended to have the kit installed by a professional mechanic to ensure proper installation and optimal performance.

Details:

The kits features deliver enhanced durability, reduced noise, and optimized combustion, making them suitable for a wide range of high-performance automotive builds.Features:Forged 2618-T6 construction strength durability Skirt coating reduces friction wear smoother operation Offset pins minimize piston rock operating noise Notched skirts provide optimal clearance at bottom dead center Accumulator groove enhances ring seal performance. An accumulator groove facilitates better combustion gas management below the top ring, promoting a more consistent and positive ring seal for improved performance efficiency. The forged construction enhances tensile strength, ensuring longevity even under high-stress conditions, while the skirt coating reduces operating friction and wear, contributing to smoother engine operation. Offset pins help minimize piston rock and operating noise, improving overall engine stability.

Designed for fitment in engines requiring a 4.250-inch bore and 4.375-inch stroke, these Pistons are ideal enthusiasts seeking reliable power with precise engineering. Notched skirts allow for optimal clearance at bottom dead center, preventing contact during piston movement. Crafted from forged 2618-T6 aluminum, these Pistons offer superior strength, durability, and precise grain flow alignment to withstand the demands of aggressive builds. The kit includes two Pistons, premium ring packs, wrist pins, and wire locks, providing all necessary components for a complete installation.

part #: 398730 prices

• $376.30-$474.99

specifications pistondon:

• brand: Je Pistons
• mpn: 398730
• part type: Piston
• upc: 193564567390

general pistondon:

• condition: New
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits

offer pistondon:

• sold: 0
• options: Ship-to-home
• started: January 16, 2026
• quantity: 3
• availability: In Stock

shipping pistondon:

• class: Standard
• carrier: FedEx
• service: FedEx Ground / FedEx Home Delivery
• cost: $0.00
• type: Fixed
• transit: 4-7 Days

payments pistondon:

• wallet: Google-pay
• credit card: Discover
• other

returns pistondon:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

seller pistondon:

• rating: 99.6%
• city: Largo, Florida
• # reviews: 31473

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