DSS Racing FX Series Forged Flat Top Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Models

1-6840-4100 / 2-6840-4100 / 3-6840-4100 / K1-6840-4100 / K2-6840-4100 / K3-6840-4100

Overview:

The DSS Racing FX Series Forged Flat Top Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, delivering exceptional strength and durability for high-performance applications. Designed to fit most 6.1L SRT8 models, these pistons are ideal for enthusiasts and professional builders seeking reliable, lightweight components that withstand the rigors of aggressive driving and racing conditions.

Featuring a 4.100" bore size and a flat top design with a -1.5cc dish, these pistons optimize combustion efficiency and compression ratios, enhancing power output and throttle response. Whether you're rebuilding your engine or upgrading for increased performance, the DSS Racing FX Series pistons provide a solid foundation for your build.

Key Features:

Built with precision and performance in mind, these pistons offer a range of advanced features:

• Forged construction for superior strength and resistance to high stress
• Flat top design with a -1.5cc dish to optimize compression and combustion
• Compatible with 4.100" bore size engines, specifically the 6.1L SRT8 HEMI
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable ring sealing
• Comp height of 1.21" to maintain proper piston-to-valve clearance
• Designed for use with 3.578" stroke and 6.243" rod length setups
• Available in multiple compression ratios: 65cc (11.23:1), 74cc (10.14:1), and 85cc (9.09:1)
• Precision-machined for consistent fitment and performance

Construction & Design:

The DSS Racing FX Series pistons are crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight properties and structural integrity. Forging enhances the metal grain structure, resulting in pistons that resist cracking, scuffing, and deformation under extreme heat and pressure.

The flat top design with a slight dish (-1.5cc) is engineered to optimize combustion chamber dynamics, improving power delivery and efficiency. The pistons feature carefully machined ring grooves and pin bores to ensure proper sealing and smooth articulation with the connecting rods, whether using full-floating or press-fit wrist pins.

Installation & Fitment:

These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines with a 4.100" bore. Installation requires standard engine rebuild procedures and may involve balancing and honing to achieve optimal clearances. The pistons accommodate a 3.578" stroke crankshaft and 6.243" connecting rods, matching factory or aftermarket configurations.

Choose between full-floating or press-fit wrist pin options depending on your engine build preferences and performance goals. Proper ring installation and torque specifications should be followed to ensure reliable operation and longevity.

What's Included:

• Set of forged flat top pistons (quantity as required for engine)
• Wrist pins (full-floating or press-fit, depending on selection)
• Ring grooves pre-machined for 1.2/1.2/3mm piston rings
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram 6.1L SRT8 engines. Whether you are enhancing street performance, preparing for track use, or building a reliable high-output powerplant, these pistons provide the strength and precision needed to handle increased horsepower and torque demands.

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.