DSS Racing FX Series Forged Piston Set

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6845-4075D / 2-6845-4075D / 3-6845-4075D / K1-6845-4075D / K2-6845-4075D / K3-6845-4075D

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the 6.1L Gen III Mopar Hemi engines found in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models. Designed to deliver superior strength and durability, these pistons are ideal for enthusiasts and professional builders seeking to maximize engine performance and reliability under high-stress conditions. Whether you are upgrading for increased horsepower, improving engine longevity, or building a high-performance street or track engine, these forged pistons provide a solid foundation for your build.

With a compact dish design and precise dimensions tailored to the 373 Small Block Mopar Hemi Gen III, the FX Series pistons ensure optimal combustion chamber volume and compression ratios, contributing to efficient power delivery and engine responsiveness.

Key Features:

These pistons incorporate advanced engineering and manufacturing techniques to meet the demands of high-performance applications:

• Forged construction for enhanced strength and resistance to high combustion pressures
• Comp Height of 1.21 inches for precise piston-to-deck clearance
• 18cc dish top design to optimize combustion chamber volume and compression ratio
• .927 inch wrist pin diameter with options for full-floating or press-fit pin installation
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Compatible with a 3.578 inch stroke and 6.243 inch connecting rods for proper fitment
• Available in multiple dish volumes to achieve approximate compression ratios of 9.34:1 (65cc), 8.59:1 (74cc), and 7.85:1 (85cc)
• Precision CNC machining ensures tight tolerances and consistent performance

Construction & Design:

The DSS Racing FX Series pistons are crafted from premium forged aluminum alloy, providing an excellent balance of lightweight design and high tensile strength. This material choice allows the pistons to withstand the extreme heat and pressure generated in high-performance Mopar Hemi engines while minimizing reciprocating mass for improved throttle response.

The pistons feature a carefully engineered dish top with a -18cc volume to optimize combustion efficiency and reduce the risk of detonation. The wrist pin bore is designed to accept either full-floating or press-fit pins, offering flexibility depending on your engine build preferences. Additionally, the ring grooves are machined to tight specifications to ensure proper ring sealing and durability under demanding conditions.

Installation & Fitment:

These pistons are designed as direct replacements for the 6.1L Gen III Mopar Hemi engines used in Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models. Installation requires standard engine assembly procedures, and the pistons are compatible with the factory stroke of 3.578 inches and connecting rod length of 6.243 inches. Depending on your build, you may select full-floating or press-fit wrist pins to match your engine’s requirements.

Proper ring end gap and piston-to-wall clearance should be checked during assembly to ensure optimal performance and longevity. These pistons are suitable for both street performance upgrades and more aggressive racing applications.

What's Included:

• Set of forged pistons for 6.1L Gen III Mopar Hemi engines
• Wrist pins (full-floating or press-fit options depending on SKU)
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for Mopar enthusiasts and professional engine builders who demand reliable, high-strength components for their 6.1L SRT8 engines. Whether upgrading a street vehicle for enhanced performance, building a track-ready machine, or restoring a high-output Mopar engine, the DSS Racing FX Series pistons offer the durability and precision needed to support increased power levels and aggressive driving 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.