DSS Racing FX Series Forged Flat Top Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 5.7L Gen III Hemi

1-6700-3957 / 2-6700-3957 / 3-6700-3957 / K1-6700-3957 / K2-6700-3957 / K3-6700-3957

Overview:

The DSS Racing FX Series Forged Flat Top Piston Set is engineered specifically for the 5.7L Gen III Hemi engines found in most Chrysler, Dodge, Jeep, and Ram models. Designed to replace factory pistons, this set offers enhanced strength and durability for high-performance applications. Whether you are rebuilding your engine or upgrading for increased power and reliability, these pistons provide a precise fit and superior performance.

Ideal for enthusiasts and professional builders alike, the FX Series pistons are crafted to withstand the rigors of street, strip, and track use. Their flat top design and optimized compression volumes allow for flexible tuning options and improved combustion efficiency.

Key Features:

These forged pistons incorporate advanced engineering to deliver reliable performance and longevity. Key features include:

• Compatible with 5.7L Gen III Hemi engines in Chrysler, Dodge, Jeep, and Ram vehicles
• Forged construction for superior strength and resistance to detonation
• Flat top design with a -1.5cc dish for optimized combustion chamber volume
• Compression height of 1.09 inches for precise piston-to-deck clearance
• .927-inch wrist pin diameter with options for full-floating or press-fit pins
• Ring groove dimensions of 1.2mm top and second rings, 3mm oil ring for effective sealing
• Designed for use with a 4.050-inch stroke crankshaft and 6.125-inch connecting rods
• Available in multiple combustion chamber volumes to tailor compression ratios: 65cc (approx. 11.86:1), 74cc (approx. 10.7:1), and 85cc (approx. 9.58:1)

Construction & Design:

The FX Series pistons are manufactured from high-grade forged aluminum alloy, providing an excellent balance of strength and lightweight characteristics. The forging process enhances grain structure and mechanical properties, ensuring these pistons can endure high cylinder pressures and temperatures common in performance engines.

The flat top design with a slight dish (-1.5cc) optimizes combustion efficiency and allows for flexible tuning across various compression ratios. Precision machining ensures tight tolerances for piston-to-cylinder wall clearance and ring groove dimensions, contributing to reduced friction and improved sealing.

Installation & Fitment:

These pistons are designed as direct replacements for factory pistons in the 5.7L Gen III Hemi engines used by Chrysler, Dodge, Jeep, and Ram. Installation requires standard engine rebuild procedures, including proper ring installation and piston pin fitting. Depending on the wrist pin option selected, either full-floating or press-fit pins can be used to match your build preferences.

Due to the precise compression height and piston design, minimal modifications are needed to the block or cylinder head. Always verify clearances and ring end gaps during installation to ensure optimal performance and reliability.

What's Included:

• Set of forged flat top pistons (quantity as per engine requirements)
• Wrist pins (full-floating or press-fit, depending on selected option)
• Optional piston rings (if included in specific kits)
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and professional shops upgrading or rebuilding 5.7L Gen III Hemi engines. Whether you are enhancing a street machine, preparing a drag racer, or building a reliable daily driver with increased power output, these pistons provide the durability and precision needed for demanding applications.

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.