DSS Racing FX Series Forged Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 6.2L & 6.4L Gen III Hemi Models

1-6815-4090 / 2-6815-4090 / 3-6815-4090 / K1-6815-4090 / K2-6815-4090 / K3-6815-4090

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for high-performance applications in Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat, 6.4L 392, and other Gen III Hemi engines. Designed to handle the extreme demands of boosted and naturally aspirated setups, these pistons offer superior strength and durability compared to stock cast components. Whether you’re building a street performance engine or a race-ready powerplant, these forged pistons provide the reliability and precision needed to maximize power and efficiency.

With a 4.090" bore size and a compact dish top design, the FX Series pistons optimize combustion chamber volume for improved compression ratios and combustion efficiency. They are ideal for enthusiasts and professional builders seeking to upgrade their engine internals for enhanced performance and longevity.

Key Features:

These DSS Racing forged pistons incorporate advanced design and manufacturing techniques to deliver exceptional performance and durability. Key features include:

• Forged 426 Small Block Mopar Hemi Gen III construction for maximum strength
• 4.090" bore size compatible with most 6.2L and 6.4L Gen III Hemi engines
• Comp height of 1.12" for precise piston-to-deck clearance
• 18cc dish top design to optimize combustion chamber volume and compression ratio
• .927" pin diameter with options for full-floating or press-fit wrist pins
• Ring groove dimensions of 1.2/1.2/3mm for reliable ring sealing and reduced friction
• Stroke compatibility of 4.050" and connecting rod length of 6.125" for balanced engine geometry
• Available in multiple dish volumes (65cc, 74cc, 85cc) to achieve approximate compression ratios from 8.82 to 10.53
• Precision CNC machining ensures tight tolerances and consistent performance

Construction & Design:

Each piston in the FX Series is forged from high-grade aluminum alloy, providing an optimal balance of lightweight strength and thermal conductivity. The forging process enhances the grain structure of the metal, resulting in superior fatigue resistance and durability under high-stress conditions. The pistons feature a carefully engineered dish top design with a -18cc volume to fine-tune combustion chamber characteristics and compression ratios, supporting a range of engine builds from street to race.

The wrist pin bore is designed to accept either full-floating or press-fit pins, allowing builders flexibility based on their application and performance goals. Ring grooves are precision-machined to accommodate performance ring sets, ensuring excellent sealing and reduced blow-by. Overall, the FX Series pistons are built to withstand the rigors of boosted, high-horsepower, and high-RPM operation.

Installation & Fitment:

The DSS Racing FX Series Forged Piston Set is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat, 6.4L 392, and other Gen III Hemi engines. Installation requires standard engine assembly procedures, including proper ring end gap setting, wrist pin installation, and piston orientation. These pistons are compatible with a 4.090" bore and a 4.050" stroke, matching factory or aftermarket crankshafts and rods with a 6.125" length.

Builders should verify clearances and compression ratios based on their specific cylinder head and gasket combinations. No major modifications are typically required, making these pistons an excellent upgrade for performance rebuilds or engine swaps.

What's Included:

• Set of forged pistons (quantity as per kit selection)
• Wrist pins (full-floating or press-fit options depending on SKU)
• Snap rings for wrist pin retention
• Detailed specifications and installation guidelines

Ideal For:

The DSS Racing FX Series Forged Piston Set is ideal for automotive enthusiasts, professional engine builders, and racers seeking to upgrade the internals of their Gen III Hemi engines. These pistons are well-suited for high-performance street vehicles, drag racing, road racing, and any application demanding enhanced strength, reliability, and optimized compression. Whether upgrading a Hellcat, 392, or other 6.2L/6.4L Mopar Hemi, these pistons provide a solid foundation for increased power and engine longevity.

DSS Racing — Founded in 1983 originally as Danny’s Speed Shop, DSS Racing has grown from a small Midwest performance engine shop into a respected name in forged engine components for the high-performance and racing markets. Based in St. Charles, Illinois, DSS is best known for its forged pistons and machined engine parts made in the USA that have been used in championship engines and thousands of builds, blending old-school racing roots with precision manufacturing for enthusiasts and racers alike.