DSS Racing FX Series Forged Flat Top Pistons Set

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

1-6720-3957 / 2-6720-3957 / 3-6720-3957 / K1-6720-3957 / K2-6720-3957 / K3-6720-3957

Overview:

The DSS Racing FX Series Forged Flat Top Pistons Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Hemi engine. Designed to replace factory pistons, these forged pistons offer enhanced strength and durability for high-performance and rebuild applications. Ideal for enthusiasts and professional builders looking to improve engine reliability and power potential, this piston set supports a range of compression ratios to suit various build requirements.

With a flat top design and precise comp height, these pistons are optimized for efficient combustion and consistent performance. Whether upgrading a stock engine or building a high-output powerplant, the DSS Racing FX Series pistons provide a solid foundation for long-lasting engine operation.

Key Features:

These pistons incorporate advanced engineering and materials to meet the demands of modern performance engines. Key features include:

• Forged construction for superior strength and resistance to detonation
• Flat top design with a -1.5cc volume for optimized combustion chamber shape
• Comp height of 1.21 inches for precise piston-to-deck clearance
• .945-inch wrist pin diameter, available in full-floating or press-fit configurations
• 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 compression ratios approximately 10.61:1 (65cc), 9.58:1 (74cc), and 8.59:1 (85cc)
• Designed for the 352 Small Block Mopar Hemi Gen III FX engine platform

Construction & Design:

Manufactured from premium forged aluminum alloy, these pistons deliver exceptional strength-to-weight ratio and thermal conductivity. The forging process enhances grain structure, providing increased durability under extreme combustion pressures and temperatures. The flat top piston crown is precision-machined to ensure consistent volume and optimal combustion efficiency.

The pistons feature carefully engineered ring grooves to maintain ring seal and reduce blow-by, while the wrist pin bore is designed for either full-floating or press-fit installation, allowing flexibility depending on engine build preferences. The overall design balances strength, weight, and thermal management to support both street and track applications.

Installation & Fitment:

This piston set is designed as a direct fit replacement for most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, specifically the Gen III 352 Small Block Mopar Hemi FX series. Installation requires standard engine rebuild procedures and may necessitate matching the piston compression height and ring package to the specific engine build. No major modifications are typically needed when replacing factory pistons with this set, making it suitable for both professional engine builders and experienced enthusiasts.

What's Included:

• Set of forged flat top pistons (quantity as required for engine)
• Wrist pins (.945" diameter), full-floating or press-fit depending on selection
• Precision-machined ring grooves ready for high-performance piston rings

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. It suits applications ranging from mild street performance to moderate race builds where enhanced strength and reliability are critical. The multiple compression ratio options allow customization for various fuel types and tuning goals.

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.