DSS Racing FX Series Forged Flat Top Pistons

Fits Chrysler / Dodge / Jeep / Ram 6.4L 392 / 6.2L Hellcat & Trackhawk Gen III Hemi Engines

1-6810-4090 / 2-6810-4090 / 3-6810-4090 / K1-6810-4090 / K2-6810-4090 / K3-6810-4090

Overview:

The DSS Racing FX Series Forged Flat Top Pistons are precision-engineered performance components designed specifically for most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat, 6.4L 392, and Trackhawk Gen III Hemi engines. These pistons are crafted to deliver exceptional strength and durability under high-stress conditions, making them ideal for enthusiasts seeking reliable power upgrades and engine longevity.

Built to exacting specifications, these pistons feature a flat top design with a -1.5cc dish volume, optimizing combustion efficiency and compression ratios for improved performance. Whether you are building a high-performance street engine or a race-ready powerplant, the DSS Racing FX Series pistons provide the foundation for consistent, high-output operation.

Key Features:

Engineered for durability and performance, these pistons offer a range of advanced features:

• Forged from high-strength aluminum alloy for superior toughness and heat resistance
• Flat top piston design with -1.5cc dish volume to optimize combustion chamber dynamics
• Comp height of 1.12" for precise deck clearance and piston-to-head geometry
• .927" wrist pin diameter with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Compatible with 4.090" bore applications and 4.050" stroke crankshafts
• Designed for use with 6.125" connecting rods, matching factory and aftermarket setups
• Available in multiple compression volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 10.13:1 to 12.55:1
• Precision CNC-machined for consistent fit and finish

Construction & Design:

DSS Racing FX Series pistons are forged from premium aerospace-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 pistons that resist cracking and deformation under extreme combustion pressures and temperatures.

The flat top design reduces quench distance and promotes efficient flame propagation, contributing to improved power output and fuel efficiency. The pistons are engineered with tight tolerances and feature robust ring lands and skirt profiles to minimize piston slap and wear during high-RPM operation.

Installation & Fitment:

These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram Gen III Hemi 6.2L and 6.4L engines, including Hellcat, 392, and Trackhawk models. Installation requires standard engine rebuild procedures, including proper honing of cylinder bores and precise ring end gap setting to ensure optimal sealing and longevity.

Depending on the wrist pin configuration selected (full-floating or press-fit), minor adjustments to the connecting rods or pins may be necessary. It is recommended to consult with a professional engine builder to verify compatibility with your specific build and to achieve the best performance results.

What's Included:

• Set of four DSS Racing FX Series Forged Flat Top Pistons (4.090" bore size)
• Wrist pins sized at .927" with full-floating or press-fit options
• Precision-machined piston rings compatible with 1.2/1.2/3mm groove dimensions (rings sold separately)
• Installation instructions and technical specifications sheet

Ideal For:

These pistons are ideal for performance enthusiasts and professional engine builders upgrading or rebuilding Chrysler, Dodge, Jeep, and Ram Gen III Hemi engines. They are well-suited for applications ranging from street performance and drag racing to off-road and track use, where enhanced strength, reliability, and compression tuning are critical.

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.