DSS Racing FX Series Gen III Hemi Forged Piston Set

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

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

Overview:

The DSS Racing FX Series Gen III Hemi Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Designed to handle the demands of high-performance applications, these pistons offer superior strength and durability compared to stock cast pistons. Ideal for enthusiasts and professional builders looking to enhance engine reliability and power output, this piston set ensures consistent performance under extreme conditions.

With a 4.100" bore size and a compact 1.21" compression height, these pistons are optimized for the 378 Small Block Mopar Hemi Gen III platform. The flat-top design with a -1.5cc dish helps achieve precise combustion chamber volumes, supporting a range of compression ratios for various tuning needs.

Key Features:

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

• Forged construction for enhanced strength and resistance to detonation
• Flat-top piston design with -1.5cc dish for optimized combustion efficiency
• Pin diameter of .927" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Compression height of 1.21" tailored for Gen III Hemi engine architecture
• Compatible with a 3.578" stroke and 6.243" connecting rods for precise fitment
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to support compression ratios from 9.09:1 to 11.23:1
• Designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines for versatile application

Construction & Design:

DSS Racing utilizes premium forged aluminum alloy to manufacture these pistons, ensuring superior tensile strength and thermal conductivity. The forging process refines the grain structure of the metal, resulting in pistons that withstand high cylinder pressures and temperatures typical of performance and racing environments.

The pistons feature precision-machined ring grooves and pin bores to maintain tight tolerances and reduce friction. The flat-top design with a slight dish improves combustion efficiency and helps control detonation, making these pistons suitable for both street and track use.

Installation & Fitment:

These pistons are designed as direct replacements for the 6.1L SRT8 Gen III Hemi engines found in Chrysler, Dodge, Jeep, and Ram vehicles. Installation requires standard engine rebuild procedures and may involve balancing and blueprinting to achieve optimal performance. The pistons accommodate either full-floating or press-fit wrist pins, providing flexibility based on builder preference.

Due to their precise dimensions and compatibility with stock components such as rods and crankshaft stroke, these pistons integrate seamlessly into existing engine setups with minimal modifications.

What's Included:

• Set of forged pistons sized for 4.100" bore
• Compatible wrist pin options (full-floating or press-fit)
• Precision-machined ring grooves ready for high-performance piston rings

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 building a street performance engine or a track-focused powerplant, these forged pistons provide the strength and reliability needed to handle increased boost, nitrous, or naturally aspirated power levels.

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.