DSS Racing FX Series Forged Piston Set

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

1-6708-3947 / 2-6708-3947 / 3-6708-3947 / K1-6708-3947 / K2-6708-3947 / K3-6708-3947

Overview:

The DSS Racing 5.7 Stroker Small Block Mopar Hemi Gen III FX Series Forged Piston Set is engineered for enthusiasts and builders seeking enhanced durability and performance for their Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. Designed to accommodate stroker builds with a 4.050" stroke and 6.125" connecting rods, these pistons provide a reliable foundation for high-output applications. Whether upgrading for street performance or track use, this piston set offers superior strength and precision fitment to maximize engine efficiency and longevity.

With a comp height of 1.09" and a +9cc dome top, these pistons help achieve optimal compression ratios tailored to your build, ranging approximately from 10.65:1 to 13.66:1 depending on combustion chamber volume. The set supports both full-floating and press-fit wrist pins, ensuring versatility for various engine configurations.

Key Features:

Built to meet the demands of high-performance Mopar Hemi engines, the DSS Racing FX Series pistons offer the following key features:

• Forged construction for superior strength and durability under extreme conditions
• Designed specifically for 5.7L Small Block Mopar Hemi Gen III engines with FX series specifications
• +9cc dome top design to optimize compression and combustion efficiency
• Comp height of 1.09" for precise piston-to-deck clearance
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Stroke compatibility of 4.050" and rod length of 6.125" for stroker engine builds
• Pin diameter of .927" supporting full-floating or press-fit wrist pin options
• Available in multiple combustion chamber volume options (65cc, 74cc, 85cc) to tailor compression ratios
• Precision machining ensures consistent fitment and performance

Construction & Design:

Each piston in this set is crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight strength and thermal conductivity. The forging process enhances the metal’s grain structure, resulting in pistons that resist cracking, scuffing, and deformation under high stress. The +9cc dome top is engineered to increase compression while maintaining optimal combustion chamber shape for efficient power delivery.

The pistons feature carefully designed ring grooves sized at 1.2mm for the top two rings and 3mm for the oil ring, ensuring effective sealing and oil control. The wrist pin bore supports either full-floating or press-fit pins, allowing builders to customize their assembly based on application needs. This attention to detail in design and manufacturing ensures reliable operation in demanding performance environments.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines equipped with the Gen III Small Block Mopar Hemi platform. Installation requires standard engine rebuild procedures and may involve modifications depending on the specific stroker build and compression ratio desired. Proper ring end gap and piston-to-wall clearances should be verified during assembly to ensure optimal performance and longevity.

These pistons are compatible with a 4.050" stroke crankshaft and 6.125" connecting rods, making them ideal for stroker engine configurations. Builders should confirm compatibility with their existing components and machining specifications before installation.

What's Included:

• Set of 8 forged pistons with +9cc dome tops
• Wrist pin bore configured for full-floating or press-fit pins
• Precision-machined ring grooves for 1.2/1.2/3mm piston rings
• Technical specifications and fitment guidelines

Ideal For:

This DSS Racing FX Series Forged Piston Set is ideal for performance enthusiasts, engine builders, and professional shops upgrading or rebuilding 5.7L Hemi engines for increased displacement and power. It suits stroker builds requiring enhanced durability and compression tuning, including street performance, drag racing, and off-road applications. If you demand reliable, high-quality components that withstand the rigors of high-performance driving, this piston set is an excellent choice.

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.