DSS Racing FX Series Forged Piston Set

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

1-6840-4055 / 2-6840-4055 / 3-6840-4055 / K1-6840-4055 / K2-6840-4055 / K3-6840-4055

Overview:

The DSS Racing Gen III Hemi FX Series Forged Piston Set is engineered specifically for the 6.1L SRT8 engines found in Chrysler, Dodge, Jeep, and Ram vehicles. Designed to deliver superior strength and durability, these pistons are ideal for enthusiasts and professional builders seeking to enhance engine reliability and performance under demanding conditions. Whether you're rebuilding your small block Mopar Hemi or upgrading for higher boost and power levels, this piston set offers a precise fit and excellent combustion efficiency.

With a 4.055" bore size and a compact flat-top design, these pistons optimize compression ratios while maintaining compatibility with stock and aftermarket components. The set is tailored to fit the 370 Small Block Mopar Hemi Gen III platform, ensuring seamless integration and dependable operation.

Key Features:

These forged pistons incorporate advanced engineering and materials to meet the rigorous demands of high-performance applications:

• Compatible with 6.1L SRT8 engines from Chrysler, Dodge, Jeep, and Ram
• 4.055" bore size tailored for most Gen III Hemi builds
• Flat-top piston design with -1.5cc volume for optimized combustion
• Comp height of 1.21" for precise deck clearance and compression control
• .927" wrist pin diameter with options for full-floating or press-fit pins
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring for effective sealing
• Compatible with 3.578" stroke and 6.243" connecting rods
• Available in multiple compression ratio configurations: 65cc (11.05:1), 74cc (9.98:1), and 85cc (8.93:1)
• Precision forged for enhanced strength and fatigue resistance

Construction & Design:

DSS Racing pistons are crafted from high-quality forged aluminum alloy, providing an excellent balance of lightweight construction and exceptional durability. The forging process refines the grain structure of the metal, resulting in pistons that withstand high cylinder pressures and elevated temperatures typical of performance engines.

The flat-top design with a slight volume reduction (-1.5cc) enhances combustion efficiency and helps achieve the desired compression ratios without requiring extensive cylinder head modifications. The pistons feature carefully engineered ring grooves to accommodate high-performance piston rings, ensuring optimal sealing and oil control.

Pin options include full-floating or press-fit configurations, allowing builders to select the best setup for their specific application and performance goals. The precise comp height and bore sizing guarantee a reliable fit within the Gen III Hemi block architecture.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.1L SRT8 Gen III Hemi engine. Installation requires standard engine rebuilding procedures, including proper honing of the cylinder bores to 4.055" and careful measurement of deck clearance and ring end gaps.

Builders should verify rod length compatibility (6.243") and stroke (3.578") to ensure optimal piston-to-valve clearance and compression ratio. The pistons accommodate both full-floating and press-fit wrist pins, providing flexibility during assembly. No major modifications to the block or heads are typically necessary when using these pistons within their intended applications.

What's Included:

• Set of forged pistons (quantity as required for engine configuration)
• Wrist pins (.927" diameter), full-floating or press-fit options
• Precision-machined ring grooves for 1.2/1.2/3mm piston rings (rings not included)

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding 6.1L SRT8 Gen III Hemi engines. It suits applications ranging from street performance to moderate forced induction setups, where enhanced strength and reliable compression are critical. The pistons provide a solid foundation for increasing power output while maintaining engine longevity 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.