DSS Racing FX Series Forged Piston Set

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6847-4075D / 2-6847-4075D / 3-6847-4075D / K1-6847-4075D / K2-6847-4075D / K3-6847-4075D

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the 6.1L Gen III Hemi engines found in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models. Designed to handle high-performance demands, these pistons offer enhanced strength and durability over stock cast pistons, making them an excellent upgrade for enthusiasts seeking improved engine reliability and power potential. Whether you are building a street performance engine or a track-focused powerplant, these forged pistons provide the foundation for consistent, high-output operation.

With a compact dome top design and precise dimensions tailored to the 373 Small Block Mopar Hemi Gen III, this piston set ensures optimal combustion chamber volume and compression ratios, supporting a variety of tuning and build configurations.

Key Features:

These DSS Racing forged pistons incorporate advanced engineering and materials to deliver superior performance and longevity. Key features include:

• Forged construction for enhanced strength and resistance to detonation
• FX Series design optimized for the 6.1L Gen III Hemi engine architecture
• Compact dome top with +4cc volume to support various compression ratios
• Pin diameter of .927" compatible with full-floating or press-fit wrist pins
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable ring sealing
• Stroke compatibility of 3.578" and rod length of 6.243" for precise fitment
• Available in multiple dome volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.54 to 12.0
• Designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models without modification

Construction & Design:

DSS Racing utilizes premium forged aluminum alloy in the FX Series pistons, delivering a lightweight yet incredibly robust component capable of withstanding the high cylinder pressures typical of performance Hemi engines. The pistons feature a carefully engineered dome shape that optimizes combustion efficiency and supports a range of compression ratios to suit different power goals and fuel types.

Precision machining ensures tight tolerances for ring grooves and pin bores, contributing to reduced friction and improved sealing. The pistons are compatible with both full-floating and press-fit wrist pins, allowing flexibility in engine assembly preferences.

Installation & Fitment:

These pistons are designed as direct replacements for the factory pistons in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, requiring no custom modifications for proper installation. Their dimensions and design maintain factory clearances and compatibility with existing rods and cylinder bores, simplifying the rebuild or upgrade process.

Professional installation is recommended to ensure correct ring end gap, piston orientation, and torque specifications are met for optimal performance and longevity.

What's Included:

• Set of forged DSS Racing FX Series pistons (quantity as per engine requirements)
• Compatible wrist pin options (full-floating or press-fit, depending on selection)
• Detailed specifications and installation guidelines

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding their 6.1L Gen III Hemi engines. It suits applications ranging from street performance and daily driving to high-output track and drag racing builds where increased strength, reliability, and compression tuning flexibility are essential.

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.