DSS Racing FX Series Forged Pistons 4.090" Bore: Fits most Hemi Models

DSS Racing FX Series Forged Pistons

Fits Most Chrysler / Dodge / Jeep / Ram 6.2L Hellcat & Trackhawk Models

1-6850-4090 / 2-6850-4090 / 3-6850-4090 / K1-6850-4090 / K2-6850-4090 / K3-6850-4090

Overview:

The DSS Racing FX Series Forged Pistons are precision-engineered components designed specifically for the Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk engines. Crafted to meet the demanding requirements of high-performance applications, these pistons provide enhanced strength, durability, and reliability under extreme conditions. Ideal for enthusiasts and professional builders looking to upgrade or rebuild their Hellcat engines, these pistons support increased power output while maintaining engine efficiency and longevity.

With a bore size of 4.090 inches and a compact flat-top design, these pistons are optimized for performance builds that require precise combustion chamber control and improved compression ratios. Whether you’re building a street machine or a track-ready powerhouse, the DSS Racing FX Series pistons deliver consistent performance and durability.

Key Features:

Designed with advanced engineering and manufacturing techniques, the DSS Racing FX Series Forged Pistons offer a range of features that enhance engine performance and reliability:

• Forged from high-strength aluminum alloy for superior durability and heat resistance
• Flat-top piston design with -1.5cc dish volume for optimized combustion and compression
• Pin diameter of .945" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Comp height of 1.275" to ensure proper deck clearance and piston-to-valve clearance
• Compatible with 6.2" connecting rods and 3.578" stroke crankshafts typical of the 376 Small Block Mopar Hemi Gen III
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.06:1 to 11.2:1
• Precision CNC machining for tight tolerances and consistent fitment
• Engineered for both street and track applications, supporting high horsepower and boost levels

Construction & Design:

The DSS Racing FX Series pistons are forged from premium-grade aluminum alloy, providing an excellent balance of strength and lightweight properties. Forging enhances the grain structure of the metal, resulting in pistons that resist cracking, scuffing, and thermal fatigue even under high cylinder pressures and temperatures.

The flat-top design with a slight dish volume (-1.5cc) optimizes the combustion chamber shape for efficient flame propagation and power delivery. The pistons feature carefully engineered ring grooves to maintain ring seal and reduce friction, while the pin bore supports either full-floating or press-fit wrist pins, allowing builders to select the best option for their application.

Installation & Fitment:

These pistons are designed to fit most Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk engines, specifically the 376 Small Block Mopar Hemi Gen III platform. Installation requires standard engine assembly procedures, including proper ring end gap setting, wrist pin installation, and piston orientation. Due to the precision manufacturing and exact bore size of 4.090", minimal machining adjustments are typically needed when used with compatible cylinder blocks.

Builders should verify piston-to-valve clearance and deck height compatibility based on their specific engine build and compression ratio goals. DSS Racing pistons are suitable for both full rebuilds and performance upgrades, providing a reliable foundation for high-output Hellcat engines.

What's Included:

• Set of four DSS Racing FX Series Forged Pistons (4.090" bore)
• Wrist pin compatibility for full-floating or press-fit installation
• Detailed specifications for ring groove sizes and piston dimensions

Ideal For:

These pistons are ideal for automotive enthusiasts, engine builders, and racers who demand high strength and reliability from their Hellcat or Trackhawk 6.2L engines. Whether upgrading for forced induction, high compression naturally aspirated builds, or track-focused applications, the DSS Racing FX Series pistons provide the durability and performance needed to handle increased power levels and aggressive driving conditions.