DSS Racing FX Series Forged Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 5.7L Hemi Models

1-6720-3947 / 2-6720-3947 / 3-6720-3947 / K1-6720-3947 / K2-6720-3947 / K3-6720-3947

Overview:

The DSS Racing Gen III Hemi FX Series Forged Piston Set is engineered specifically for the 5.7L Hemi engines found in a wide range of Chrysler, Dodge, Jeep, and Ram vehicles. Designed to meet the demands of high-performance builds and engine rebuilds, these pistons offer exceptional strength and durability. Whether you are upgrading your engine for increased power or replacing worn components, this piston set provides a reliable foundation for enhanced engine longevity and performance.

Built to exacting specifications, these pistons feature a compact design with a 1.21" compression height and a -1.5cc flat top, optimizing combustion efficiency and compression ratios. They are compatible with both full-floating and press-fit wrist pins, allowing for flexible installation options depending on your engine setup.

Key Features:

Engineered for performance and durability, the DSS Racing FX Series Forged Pistons include the following key features:

• Forged construction for superior strength and resistance to high-stress conditions
• Designed for 350 Small Block Mopar Hemi Gen III engines with a 3.578" stroke
• Compression height of 1.21" for optimal piston-to-cylinder head clearance
• 1.5cc flat top piston design to enhance combustion efficiency
• Pin diameter of .945" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios
• Compatible with 6.243" connecting rods for precise fitment
• Approximate compression ratios ranging from 8.54 to 10.55 depending on chamber volume

Construction & Design:

Each piston in the DSS Racing FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight construction and exceptional strength. The forging process enhances the metal’s grain structure, resulting in pistons that withstand the rigors of high RPM and elevated cylinder pressures without compromising durability.

The flat top design with a slight negative volume (-1.5cc) promotes efficient combustion, helping to maximize power output while maintaining safe compression levels. Precision machining ensures tight tolerances for optimal ring sealing and minimal friction, contributing to improved engine efficiency and longevity.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Hemi Gen III engine. Installation requires standard engine rebuild procedures, including proper honing of cylinder walls and careful measurement of piston-to-wall clearance. The pistons accommodate either full-floating or press-fit wrist pins, providing flexibility based on your engine’s connecting rod design.

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

What's Included:

• Set of forged pistons for 5.7L Gen III Hemi engines
• Compatible wrist pins (full-floating or press-fit options)
• Precision-machined piston rings (1.2mm top and second rings, 3mm oil ring)
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and performance tuners seeking a durable, high-quality upgrade for their 5.7L Hemi engines. Whether you are restoring a classic Mopar, building a street performance engine, or preparing a vehicle for mild to moderate racing applications, these pistons provide the strength and precision needed to support increased power and reliability.

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.