DSS Racing FX Series Gen III Hemi Forged Piston Set

Fits Chrysler, Dodge, Jeep, Ram 6.2L Hellcat & Trackhawk Models

1-6860-4125 / 2-6860-4125 / 3-6860-4125 / K1-6860-4125 / K2-6860-4125 / K3-6860-4125

Overview:

The DSS Racing FX Series Gen III Hemi Forged Piston Set is engineered specifically for high-performance applications in most Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk engines. Designed to handle the extreme demands of forced induction and high horsepower builds, these pistons offer superior strength and durability compared to stock cast pistons. Whether you are building a street performance engine or a track-ready powerhouse, this piston set delivers reliable performance and enhanced engine longevity.

These pistons are ideal for enthusiasts and professional builders seeking to upgrade their Gen III Hemi engines with components that maintain factory bore size while improving compression and combustion efficiency.

Key Features:

Built to exacting standards, the DSS Racing FX Series pistons incorporate advanced design elements to optimize performance and reliability:

• Compatible with 4.125" bore size, fitting most Chrysler/Dodge/Jeep/Ram 6.2L Hellcat and Trackhawk engines
• Forged construction for superior strength and resistance to detonation
• Flat top design with a -1.5cc dish for optimized combustion chamber volume
• Comp height of 1.275" to maintain proper deck clearance and compression ratio
• .927" wrist pin diameter available in full-floating or press-fit options
• Ring groove dimensions: 1.2mm top and second ring grooves, 3mm oil ring groove for effective sealing
• Compatible with 3.578" stroke and 6.2" connecting rods typical of Gen III Hemi engines
• Available in multiple compression ratio configurations (approximate): 65cc for 11.36:1, 74cc for 10.26:1, and 85cc for 9.2:1

Construction & Design:

Each piston in the FX Series is precision forged from high-grade aluminum alloy, ensuring exceptional strength-to-weight ratio and thermal conductivity. The flat top design with a slight dish enhances combustion efficiency and helps control detonation under high boost or high compression conditions. The pistons are engineered to exact tolerances to fit the 4.125" bore of Gen III Hemi blocks, maintaining optimal piston-to-wall clearance and ring seal.

The wrist pins are available in both full-floating and press-fit styles, allowing builders to select the best option for their application and durability requirements. The ring grooves are machined to tight specifications to accommodate high-performance piston rings, ensuring excellent sealing and oil control under demanding conditions.

Installation & Fitment:

This piston set is designed as a direct fit upgrade for most Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk engines with a 4.125" bore. Installation requires standard engine assembly procedures and proper ring end gap setting. No major modifications to the block or rods are typically necessary, making these pistons a straightforward upgrade for performance builds.

Builders should verify compatibility with their specific engine configuration and ensure proper clearances during assembly to maximize reliability and performance.

What's Included:

• Set of forged pistons for all cylinders (quantity as per engine requirements)
• Wrist pins (.927" diameter) with options for full-floating or press-fit installation
• Detailed specifications for compression height, ring groove dimensions, and piston dish volume

Ideal For:

The DSS Racing FX Series Gen III Hemi Forged Piston Set is perfect for performance enthusiasts, engine builders, and racers upgrading their 6.2L Hellcat or Trackhawk engines. It suits applications ranging from high-boost street builds to track-focused race engines where durability, strength, and precise fitment are critical. These pistons provide a solid foundation for increasing horsepower and torque while maintaining engine reliability under extreme conditions.

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.