DSS Racing FX Series Forged Piston Set

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

1-6710-3937 / 2-6710-3937 / 3-6710-3937 / K1-6710-3937 / K2-6710-3937 / K3-6710-3937

Overview:

The DSS Racing Gen III Hemi FX Series Forged Piston Set is engineered specifically for the 5.7L Hemi engines found in Chrysler, Dodge, Jeep, and Ram vehicles. Designed to replace factory cast pistons, this set offers enhanced strength and durability for high-performance and street applications. Whether you are building a mild upgrade or a serious performance engine, these pistons provide the reliability and precision needed to handle increased power and boost levels.

Ideal for enthusiasts and professional builders alike, the FX Series pistons deliver improved combustion efficiency and reduced risk of failure under extreme conditions. Their forged construction and optimized design ensure consistent performance and longevity in demanding environments.

Key Features:

These pistons incorporate advanced engineering to meet the rigorous demands of modern Hemi engines. Key features include:

• Compatible with 3.937" bore size, fitting most Chrysler / Dodge / Jeep / Ram 5.7L Hemi Gen III engines
• Forged construction for superior strength compared to OEM cast pistons
• Flat top design with a -1.5cc dish to optimize combustion chamber shape
• Compression height of 1.21" to maintain proper deck clearance
• .927" wrist pin diameter with options for full-floating or press-fit pins
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable ring sealing
• Designed for use with a 3.578" stroke crankshaft and 6.243" connecting rods
• Available in multiple compression ratios approximately ranging from 8.5:1 to 10.5:1 to suit different build goals
• Precision machining ensures tight tolerances and consistent fitment

Construction & Design:

The DSS Racing FX Series pistons are crafted from high-grade forged aluminum alloy, providing an excellent balance of strength and lightweight performance. Forging enhances the metal’s grain structure, resulting in pistons that resist cracking and deformation under high thermal and mechanical stress. The flat top design with a slight dish improves combustion efficiency and helps control detonation.

Each piston features carefully engineered ring grooves and pin bosses to ensure durability and maintain proper sealing throughout the engine’s operating range. The option for full-floating or press-fit wrist pins allows builders to tailor the setup to their specific application and performance requirements.

Installation & Fitment:

These pistons are designed as direct replacements for most 5.7L Hemi Gen III engines from Chrysler, Dodge, Jeep, and Ram. Installation requires standard engine assembly procedures, including proper ring end gap setting and piston-to-wall clearance checks. Depending on the wrist pin option selected, additional steps may be necessary to secure the pins correctly.

Due to the precision manufacturing and compatibility with stock dimensions, minimal modifications are typically needed, making this piston set an excellent choice for both rebuilds and performance upgrades.

What's Included:

• Set of forged pistons sized for 3.937" bore
• Wrist pins (.927") with choice of full-floating or press-fit configuration
• Ring grooves pre-machined for 1.2mm top and second rings, 3mm oil ring
• Installation instructions and technical specifications

Ideal For:

This piston set is perfect for engine builders and performance enthusiasts upgrading or rebuilding 5.7L Hemi Gen III engines. It suits applications ranging from street performance to moderate racing builds where enhanced durability and compression control are critical. Whether upgrading from OEM pistons or replacing worn components, the DSS Racing FX Series pistons offer a reliable foundation for increased power and engine longevity.

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.