DSS Racing FX Series Forged Piston Set

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

1-6845-4100D / 2-6845-4100D / 3-6845-4100D / K1-6845-4100D / K2-6845-4100D / K3-6845-4100D

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, including the 378 Small Block Mopar Hemi Gen III platform. Designed for enthusiasts and professional builders seeking enhanced durability and performance, these pistons offer a reliable upgrade over stock components. Whether you're rebuilding or upgrading your engine, this piston set delivers consistent strength and precision to handle increased power and demanding conditions.

With a 4.100" bore size and a compact 1.21" compression height, these pistons are optimized for high-performance applications. The -18cc dish top design helps manage compression ratios effectively, making them suitable for a variety of forced induction or naturally aspirated setups.

Key Features:

These forged pistons incorporate advanced design elements to ensure durability and performance in high-stress environments:

• Compatible with 6.1L SRT8 engines from Chrysler, Dodge, Jeep, and Ram
• 4.100" bore diameter tailored for precise fitment
• Forged construction for superior strength and resistance to detonation
• 18cc dish top to optimize combustion chamber volume and compression ratio
• Compression height of 1.21" for ideal piston-to-cylinder head clearance
• .927" wrist pin diameter with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate high-performance piston rings
• Designed to work with a 3.578" stroke and 6.243" connecting rods
• Approximate compression ratios ranging from 7.94 to 9.45 depending on combustion chamber volume

Construction & Design:

DSS Racing FX Series pistons are crafted from high-quality forged aluminum alloy, providing an excellent balance of lightweight strength and thermal conductivity. The forging process enhances grain structure, resulting in pistons that withstand extreme combustion pressures and temperatures common in performance engines.

The pistons feature a carefully engineered dish top design with an 18cc volume reduction to optimize combustion efficiency and reduce the risk of detonation. Precision machining ensures tight tolerances for superior ring sealing and minimal friction. The wrist pin bore supports both full-floating and press-fit configurations, allowing flexibility depending on engine build preferences.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, making it a direct replacement for stock pistons in these applications. Installation requires standard engine rebuild procedures, including proper honing and cleaning of the cylinder bores. Depending on your build, you may need to select the appropriate wrist pin retention method (full-floating or press-fit) to match your connecting rods.

Due to the precise compression height and bore size, these pistons maintain factory geometry, ensuring compatibility with existing cylinder heads and components without the need for extensive modifications.

What's Included:

• Set of forged pistons with 4.100" bore diameter
• Wrist pin bore compatible with .927" pins (full-floating or press-fit options)
• Precision-machined ring grooves sized 1.2/1.2/3mm

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding their 6.1L SRT8 engines. Whether you are increasing power output, improving engine reliability, or preparing your vehicle for track or street performance, these forged pistons provide a strong foundation for enhanced engine durability and efficiency.

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.