DSS Racing FX Series Forged Piston Set

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

1-6845-4085D / 2-6845-4085D / 3-6845-4085D / K1-6845-4085D / K2-6845-4085D / K3-6845-4085D

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, offering a direct fit for most models equipped with this powerplant. Designed for enthusiasts and professional builders alike, these pistons provide a robust upgrade over stock components, delivering enhanced strength and durability under high-performance conditions. Whether you are rebuilding your engine or upgrading for increased power and reliability, this piston set is crafted to meet the demands of modern performance applications.

With a bore size of 4.085 inches and a compact dish top design, these pistons optimize combustion efficiency and compression ratios, making them ideal for street, strip, or track use. Their compatibility with the 375 Small Block Mopar Hemi Gen III platform ensures precise fitment and reliable operation.

Key Features:

Built with advanced engineering and precision manufacturing, the DSS Racing FX Series Forged Pistons offer the following key features:

• Forged construction for superior strength and resistance to high stress
• 4.085" bore size tailored for Chrysler / Dodge / Jeep / Ram 6.1L SRT8 engines
• Compact dish top with -18cc volume to optimize compression and combustion
• Pin diameter of .927" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable ring sealing
• Designed for a stroke of 3.578" and connecting rod length of 6.243"
• Available in multiple compression ratios approximately ranging from 7.88 to 9.39
• Precision machining ensures consistent performance and durability

Construction & Design:

The FX Series pistons are forged from high-grade aluminum alloy, providing an excellent balance of lightweight design and exceptional strength. This construction allows the pistons to withstand the intense pressures and temperatures generated in high-performance Hemi engines. The dish top design with a -18cc volume helps control compression ratios, reducing the risk of detonation while maintaining power output.

Each piston features carefully engineered ring grooves and pin bosses to ensure optimal sealing and minimal friction. The option for full-floating or press-fit wrist pins adds versatility for different engine builds and preferences. The precise dimensions and tight tolerances reflect DSS Racing’s commitment to quality and performance.

Installation & Fitment:

This piston set is designed as a direct replacement for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, simplifying installation without the need for extensive modifications. The bore size and stroke specifications match factory dimensions, ensuring compatibility with existing engine components such as rods and rings. Proper engine assembly practices and clearances should be followed to achieve optimal performance and longevity.

What's Included:

• Set of forged pistons with 4.085" bore
• Wrist pins compatible with full-floating or press-fit installation
• Detailed specifications for compression ratios and dimensions

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers who demand reliable, high-strength components for their Mopar 6.1L SRT8 engines. Whether upgrading for increased horsepower, rebuilding a worn engine, or preparing a vehicle for track use, these pistons provide a durable foundation for enhanced engine performance and 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.