DSS Racing FX Series Forged Flat Top Pistons Set

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

1-6720-3937 / 2-6720-3937 / 3-6720-3937 / K1-6720-3937 / K2-6720-3937 / K3-6720-3937

Overview:

The DSS Racing FX Series Forged Flat Top Pistons Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, including the 348 Small Block Mopar Hemi Gen III. Designed for high-performance applications, these pistons offer a perfect balance of strength, durability, and precision fitment. Whether you are rebuilding your engine or upgrading for enhanced power and reliability, this piston set delivers consistent performance under demanding conditions.

Ideal for enthusiasts and professional builders alike, these pistons provide improved combustion efficiency and support higher compression ratios, making them suitable for street performance, mild racing, and custom engine builds.

Key Features:

Built with advanced engineering and premium materials, the DSS Racing FX Series pistons include the following features:

• Forged construction for superior strength and durability
• Flat top design with a -1.5cc dish for optimized combustion chamber volume
• Compression height of 1.21 inches for precise piston-to-deck clearance
• .945-inch wrist pin diameter with options for full-floating or press-fit installation
• Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate high-performance piston rings
• Compatible with 3.578-inch stroke crankshafts and 6.243-inch connecting rods
• Available in multiple combustion chamber volumes to support approximate compression ratios of 10.5:1 (65cc), 9.5:1 (74cc), and 8.5:1 (85cc)
• Precision CNC-machined for consistent fit and finish
• Designed to fit most Chrysler / Dodge / Jeep / Ram 5.7L Hemi engines with minimal modifications

Construction & Design:

These pistons are crafted from high-grade forged aluminum alloy, providing an excellent strength-to-weight ratio that withstands the rigors of high-performance and forced induction applications. The flat top design enhances combustion efficiency by promoting a more uniform flame front and reducing detonation risks. The pistons are engineered with tight tolerances to ensure optimal ring seal and minimal friction, contributing to improved engine longevity and power output.

The wrist pin options allow for either full-floating or press-fit installation, giving builders flexibility based on their engine setup and performance goals. The ring grooves are precisely machined to accommodate performance rings that maintain excellent sealing under high cylinder pressures.

Installation & Fitment:

Installation of the DSS Racing FX Series pistons requires standard engine rebuilding procedures and is compatible with most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines. The pistons fit engines with a 3.578-inch stroke and 6.243-inch connecting rods, making them ideal for stock or mildly modified bottom ends. Minimal modifications are needed when replacing OEM pistons, but it is recommended to verify clearances and ring end gaps during installation.

These pistons are designed to work seamlessly with factory cylinder heads and standard engine components, ensuring a straightforward upgrade path for performance enthusiasts.

What's Included:

• Set of forged flat top pistons (quantity as required for engine rebuild)
• Wrist pins (.945" diameter) suitable for full-floating or press-fit installation
• Detailed specifications for compression height, ring groove dimensions, and combustion chamber volumes

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and racers looking to upgrade or rebuild their Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. It suits applications ranging from street performance to mild racing builds, offering enhanced durability and improved combustion characteristics. Whether you are restoring a classic Mopar Hemi or building a modern performance engine, these pistons provide a reliable foundation for increased power 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.