DSS Racing FX Series Forged Flat Top Piston Set

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

1-6710-3957 / 2-6710-3957 / 3-6710-3957 / K1-6710-3957 / K2-6710-3957 / K3-6710-3957

Overview:

The DSS Racing FX Series Forged Flat Top Piston Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, including the 352 Small Block Mopar Hemi Gen III. Designed for enthusiasts and professional builders seeking enhanced durability and performance, these pistons offer a precise fit and reliable operation under demanding conditions. Their flat top design and optimized compression heights deliver improved combustion efficiency and power potential, making them an excellent upgrade for street, strip, or race applications.

Whether you are rebuilding your engine or upgrading for higher horsepower builds, these pistons provide the strength and consistency needed to handle increased boost, nitrous, or naturally aspirated power levels. DSS Racing’s commitment to quality ensures these pistons meet tight tolerances and rigorous standards for long-lasting performance.

Key Features:

Built to exacting specifications, the FX Series pistons incorporate advanced design elements to maximize engine efficiency and durability:

• Compatible with 3.957" bore sizes, fitting most Chrysler / Dodge / Jeep / Ram 5.7L Hemi engines
• Forged construction for superior strength and resistance to thermal and mechanical stress
• Flat top piston design with a -1.5cc dish for optimized combustion chamber volume
• Compression heights of 1.21 inches, tailored for Gen III 352 Small Block Mopar Hemi applications
• Pin diameter of .927 inches, available in full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm top and second rings, with a 3mm oil ring groove for effective sealing
• Stroke compatibility of 3.578 inches and connecting rod length of 6.243 inches for precise engine geometry
• Approximate compression ratios vary based on combustion chamber volume: 65cc (10.61:1), 74cc (9.58:1), and 85cc (8.59:1)
• Designed to withstand high-performance conditions including forced induction and high RPM operation

Construction & Design:

DSS Racing’s 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 resist cracking and deformation under extreme heat and pressure. The flat top design promotes efficient combustion and consistent power delivery, while the carefully engineered compression height and pin fit options ensure compatibility with a variety of engine builds.

Each piston undergoes precise machining to maintain tight tolerances, ensuring optimal ring sealing and minimal friction. The ring grooves are designed to accommodate performance ring sets, enhancing oil control and reducing blow-by. Whether you choose full-floating or press-fit wrist pins, these pistons offer flexibility to suit your assembly preferences and performance goals.

Installation & Fitment:

These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines with a 3.957" bore. Installation requires standard engine rebuilding procedures, including proper honing and cleaning of the cylinder bores. Depending on your build, you may select either full-floating or press-fit wrist pins to match your connecting rods and assembly method.

Due to the precise compression height and ring groove dimensions, these pistons fit seamlessly with compatible rods and crankshafts, minimizing the need for additional modifications. Always verify clearances and torque specifications during installation to ensure reliable operation and longevity.

What's Included:

• Set of forged flat top pistons (quantity as required for engine configuration)
• Wrist pins (full-floating or press-fit, depending on selected option)
• Optional piston clips or retainers as applicable
• Technical specifications and installation guidelines

Ideal For:

This piston set is ideal for engine builders, performance enthusiasts, and professional shops upgrading or rebuilding Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines. It suits a wide range of applications including street performance, drag racing, off-road, and mild to moderate forced induction setups. The FX Series pistons provide a reliable foundation for increasing power output while maintaining 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.