JE Pistons Forged Piston Set

Mopar Gen 3 Hemi 6.4L 4.090in Bore

367219

Overview:

The JE Pistons Gen 3 Hemi 6.4L piston set is engineered for high-performance Mopar enthusiasts seeking durability and precision in their engine builds. Designed specifically for the 6.4L Gen III Hemi engine, these forged pistons feature a 4.09-inch bore and a 4.1cc dome, optimized to enhance combustion efficiency and power output. With over 75 years of experience in racing piston technology, JE Pistons delivers a product that excels in both street and track applications.

Manufactured entirely in the USA, this piston set is ideal for racers, builders, and performance enthusiasts who demand reliability under extreme conditions. Whether you’re upgrading your engine for drag racing, dirt track, or high-performance street use, these pistons provide the strength and precision needed to maximize your Mopar’s potential.

Key Features:

Built to meet the rigorous demands of high-performance engines, the JE Pistons Gen 3 Hemi set offers the following key features:

• Forged from premium billet aluminum for superior strength and durability
• Precision-machined 4.090-inch bore to match Gen III Hemi specifications
• 4.1cc dome design to optimize compression and combustion efficiency
• 0.927-inch pin diameter for enhanced wrist pin stability and reduced wear
• Compatible with 8-cylinder Mopar 6.4L Gen III Hemi engines
• Engineered for high RPM and extreme racing conditions
• 100% designed, forged, and machined in the USA ensuring quality and consistency
• Proven performance pedigree with extensive racing success

Construction & Design:

JE Pistons utilizes advanced forging techniques combined with meticulous CNC machining to produce pistons that withstand the intense pressures of high-performance combustion. The billet aluminum construction offers an excellent strength-to-weight ratio, reducing reciprocating mass and improving engine response. The 4.1cc dome shape is carefully engineered to optimize the combustion chamber shape, promoting efficient flame propagation and power delivery.

Each piston is crafted with tight tolerances to ensure perfect fitment and durability. The 0.927-inch pin diameter enhances wrist pin stability, reducing the risk of deformation or failure under high load. This attention to detail ensures long-lasting performance and reliability in demanding racing environments.

Installation & Fitment:

This piston set is designed as a direct fit for Mopar 6.4L Gen III Hemi engines with a 4.090-inch bore. Installation requires standard engine assembly procedures, and it is recommended to follow JE Pistons’ guidelines for ring end gaps and clearances to ensure optimal performance and longevity. No major modifications are typically necessary when replacing factory pistons with this set, making it a straightforward upgrade for performance builds.

What's Included:

• Set of 8 forged pistons for Mopar Gen 3 Hemi 6.4L engine
• Precision-machined wrist pin bores
• Detailed specifications and installation guidelines

Ideal For:

This JE Pistons set is ideal for Mopar enthusiasts building or upgrading their Gen III Hemi 6.4L engines for racing, street performance, or high-horsepower applications. It suits drag racers, dirt track competitors, and performance street drivers who require a reliable, high-quality forged piston capable of handling increased boost, nitrous, or naturally aspirated power levels.

JE Pistons is a cornerstone name in forged pistons for high-performance and motorsports engines across domestic, sport compact, European, and powersports platforms. Their forged piston kits are engineered for strength and reliability in high-RPM, high-boost, and high-compression builds where factory internals won’t survive long.