J.E. PISTONS 398728 Piston Kit 193564567383 4.080 4.375 11.5 114

( Brand: J.e. Pistons ), ( Manufacturer Part Number: 398728 ), ( Part Type: Piston ), ( Bore Size: 4.080 ), ( Compression Ratio: 11.5 ), ( Displacement: 114 ), ( Piston Material: Forged 2618 Aluminum ), ( Stroke Length: 4.375 ), ( Units: Kit ), ( Alt Mpn 1: 0910-6992 ), ( Average Delivery Time: 2-3 Days ), ( Package Weight: 3.2000 ), ( Package Length: 10.55 ), ( Package Width: 5.87 ), ( Package Height: 5.47 ), ( Manufacturer Warranty: 30 Days ), ( UPC: 193564567383 )

Review J.E. PISTONS Piston Kit 4.080 Inch Bore 4.375 Stroke 11.5 114 fits M8 CR

The JE Pistons 398728 piston kit is an excellent choice for those seeking high-performance pistons for their engine. This kit is designed for applications with a bore size of 4.080 inches and a stroke length of 4.375 inches, making it suitable for various V8 and V10 engines. With a compression ratio of 11.5:1 and a connecting rod length of 114mm, these pistons deliver impressive power and efficiency.

Each piston in this kit is meticulously crafted using JE's proprietary forging process. This ensures that the pistons are strong, lightweight, and consistent in their dimensions. The pistons' crowns are designed with a domed shape to promote efficient combustion and prevent detonation. The piston skirts feature a full-length, split-pin boss design, allowing for easy ring installation and ensuring optimal ring seal.

The JE Pistons 398728 kit also includes piston pins and rings. The piston pins are made from high-strength material and are precision machined to ensure a perfect fit. The piston rings are manufactured from top-quality ring material and are designed to provide excellent sealing and durability.

This piston kit is also engineered to work with CR engine designs. The compression rings are designed to provide excellent sealing and prevent blowby, while the oil rings ensure proper oil control and prevent oil consumption. Furthermore, the pistons have a unique, asymmetrical design that helps to reduce piston-to-wall friction and improve engine efficiency.

In summary, the JE Pistons 398728 piston kit is a high-performance solution for those looking to upgrade their engine components. With its precise dimensions, robust design, and high-quality materials, this kit delivers impressive power and efficiency gains while ensuring reliable operation and long-lasting performance.

The JE Pistons 398728 piston kit (4.080 in. bore, 4.375 in. stroke, 11.5:1 compression ratio, CR 114, mating surface M8) is a popular choice for performance engine builds. Here are some pros and cons that might help you make an informed decision:

1. High-performance design: JE Pistons is known for producing high-quality pistons used in racing and high-performance applications. This kit is no exception, designed for high compression ratio and durability.

2. Precision manufacturing: JE Pistons uses state-of-the-art technology and processes to ensure the pistons are manufactured to tight tolerances, ensuring a perfect fit and optimal engine performance.

3. Customizable: The pistons are available in various sizes, strokes, and compression ratios to meet different engine build requirements.

4. Durable: The pistons are made of forged aluminum alloy, making them strong and durable, able to withstand the extreme pressures and temperatures of high-performance engines.

5. Lightweight: The pistons are designed to be as light as possible while maintaining strength, which can help improve engine performance.

1. Cost: High-performance pistons like these are more expensive than stock or OEM pistons. The cost may be a significant consideration for some.

2. Requires additional components: The pistons are just one part of an engine build, and additional components such as connecting rods, crankshaft, and cylinder heads may also need to be upgraded for optimal performance.

3. Installation: Installing high-performance pistons requires specialized tools and knowledge, which may add to the overall cost and complexity of the project.

In conclusion, the JE Pistons 398728 piston kit offers several benefits for high-performance engine builds, including precision manufacturing, durability, and customizability. However, the cost and complexity of the installation process are important considerations. Ultimately, whether this piston kit is a good investment depends on the specific goals and budget of the engine build project.

If you're serious about building a high-performance engine and are willing to invest the time, money, and expertise required, then the JE Pistons 398728 piston kit is an excellent choice. However, if cost is a significant concern or if you're not experienced in performance engine builds, then you may want to consider alternative options.

Recommendation: Before making a decision, carefully consider the specific requirements of your engine build project, including the desired compression ratio, stroke length, and budget. Research alternative options, including stock or OEM pistons, and weigh the pros and cons of each. If you decide that high-performance pistons like the JE Pistons 398728 kit are the best choice for your project, be prepared for the additional cost and complexity of the installation process.

Details:

Combined shipping available. BORE SIZE4.080. Accumulator groove taps combustion gases below the top ring to promote more consistent, positive seal and performance. 100% satisfaction guaranteed.

PART TYPE Engine Related Parts. Skirt coating reduces operating friction and wear. Includes two Pistons, premium ring packs, wrist pins and wire locks. STROKE length 4.375.

Skirt notches for optimal clearance at bottom dead center. Offset pins reduce piston rock and minimize operating noise. Item Specifics. Piston Kit - 4.080 Bore 4.375 Stroke 11.5:1 CR 114 M8 398728.

part #: 398728 prices

• $474.99-$498.99

specifications pistondon:

• for models: M8, Cr
• brand: J.e. Pistons
• mpn: 398728
• part type: Piston
• bore size: 4.080
• compression ratio: 11.5
• displacement: 114
• piston material: Forged 2618 Aluminum
• stroke length: 4.375
• units: Kit
• alt mpn 1: 0910-6992
• average delivery time: 2-3 Days
• package weight: 3.2000
• package length: 10.55
• package width: 5.87
• package height: 5.47
• manufacturer warranty: 30 Days
• upc: 193564567383

returns pistondon:

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

offer pistondon:

• quantity: 3
• availability: In Stock
• options: Ship-to-home
• started: November 1, 2025
• sold: 0

shipping pistondon:

• carrier: FedEx
• type: Calculated
• cost: $0.00
• class: Standard, Expedited, One-day
• service: FedEx Ground / FedEx Home Delivery, FedEx 2Day, FedEx Standard Overnight
• transit: 3-6 Days

general pistondon:

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

payments pistondon:

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

seller pistondon:

• # reviews: 489133
• city: Hilliard, Ohio
• rating: 99.3%

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