DSS Racing FX Series Forged Piston Set

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

1-6845-4125 / 2-6845-4125 / 3-6845-4125 / K1-6845-4125 / K2-6845-4125 / K3-6845-4125

Overview:

The DSS Racing 6.1 Stroker Gen III Hemi FX Series Forged Piston Set is engineered specifically for high-performance applications in Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Designed to accommodate a 4.125" bore, these pistons are ideal for enthusiasts looking to upgrade their 383 small block Mopar Hemi Gen III stroker builds. With a focus on durability and precision, this piston set supports increased stroke length and compression ratios, delivering reliable power gains and enhanced engine longevity under demanding conditions.

Whether you are building a street performance engine or a race-ready powerplant, these forged pistons provide the strength and dimensional accuracy needed to maximize your 6.1L Hemi’s potential.

Key Features:

These pistons incorporate advanced design elements and manufacturing techniques to ensure optimal performance and fitment:

• Compatible with 4.125" bore size for most Chrysler / Dodge / Jeep / Ram 6.1L SRT8 engines
• Forged construction for superior strength and resistance to detonation
• Comp height of 1.21" for precise deck clearance and piston-to-valve clearance
• 18cc dish top design to optimize combustion chamber volume and compression ratio
• .927" wrist pin diameter with options for full-floating or press-fit installation
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring for effective sealing
• Designed to accommodate a 3.578" stroke and 6.243" connecting rods for stroker builds
• Available in multiple dish volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.55:1 to 8.02:1
• Precision machining ensures consistent piston weight and balance for smooth operation

Construction & Design:

DSS Racing’s FX Series pistons are crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight strength and thermal conductivity. The forging process enhances the metal’s grain structure, resulting in pistons that withstand the high pressures and temperatures typical of performance Hemi engines. The dish top design reduces compression volume while maintaining efficient combustion chamber shape, helping to prevent detonation and improve power delivery.

The pistons feature carefully engineered ring grooves and wrist pin bores to ensure reliable ring sealing and wrist pin retention under high RPM and load conditions. The option for full-floating or press-fit wrist pins allows builders to select the best configuration for their specific application and durability requirements.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines with a 4.125" bore, making it a versatile choice for Gen III Hemi stroker builds. Installation requires standard engine assembly procedures, including proper ring end gap setting and wrist pin installation. Depending on the wrist pin option chosen, either full-floating or press-fit pins can be installed using appropriate retaining clips or interference fit techniques.

Builders should verify compatibility with their specific engine block and rotating assembly dimensions to ensure optimal piston-to-cylinder wall clearance and deck height. Professional installation is recommended to achieve the best performance and reliability.

What's Included:

• Set of forged pistons (quantity as required for engine configuration)
• Wrist pins (full-floating or press-fit, depending on selected option)
• Retaining clips for wrist pins (if applicable)
• Detailed specifications and installation guidelines

Ideal For:

This piston set is ideal for performance enthusiasts and engine builders upgrading or rebuilding Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. It suits stroker engine projects aiming to increase displacement and power output while maintaining durability and reliability. Whether for street performance, drag racing, or other motorsport applications, these pistons provide a solid foundation for a high-performance Gen III Hemi build.

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.