DSS Racing FX Series Forged Piston Set

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

1-6718-3947 / 2-6718-3947 / 3-6718-3947 / K1-6718-3947 / K2-6718-3947 / K3-6718-3947

Overview:

The DSS Racing FX Series +9cc Dome Top Forged Piston Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Hemi engine. Designed to enhance engine performance and durability, these pistons are an ideal upgrade for enthusiasts seeking improved combustion efficiency and reliability under demanding conditions. Whether you are rebuilding your engine or upgrading for higher power output, this piston set offers precision fitment and robust construction to meet the needs of street performance and mild racing applications.

These pistons feature a +9cc dome top design that increases compression ratios, helping to optimize power delivery and throttle response. Compatible with the 350 Small Block Mopar Hemi Gen III platform, they maintain factory dimensions for seamless installation while providing enhanced strength and thermal resistance.

Key Features:

Built for performance and reliability, the DSS Racing FX Series pistons include the following key features:

• +9cc Dome Top design for increased compression and improved combustion efficiency
• Forged construction for superior strength and durability compared to cast pistons
• Comp Height of 1.21 inches, optimized for stock and mildly modified 5.7L Hemi engines
• Pin diameter of .927 inches, available in full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm top and second rings, with a 3mm oil ring groove for effective sealing
• Compatible with a 3.578-inch stroke and 6.243-inch connecting rods
• Available in multiple combustion chamber volume options (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.53:1 to 12.19:1
• Precision CNC-machined for exact tolerances and consistent performance
• Designed to fit most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines without modification

Construction & Design:

The DSS Racing FX Series pistons are crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight strength and heat dissipation. The forging process enhances the metal grain structure, resulting in pistons that resist cracking and deformation under high combustion pressures and elevated temperatures. The dome top design increases the compression ratio by reducing combustion chamber volume, which improves power output and efficiency.

Each piston is CNC-machined to exact specifications, ensuring consistent ring groove dimensions and pin bore alignment. The option for full-floating or press-fit wrist pins allows builders to select the best fitment for their engine build and intended use. The ring grooves are designed to accommodate performance ring sets, maintaining optimal sealing and oil control for extended engine life.

Installation & Fitment:

This piston set is engineered for direct fitment in most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, including the 350 Small Block Mopar Hemi Gen III platform. Installation requires standard engine rebuild procedures, and no special modifications are typically necessary. Builders should verify piston-to-valve clearance and deck height compatibility based on their specific engine configuration and combustion chamber volume choice.

Whether you are performing a stock rebuild or upgrading for increased performance, these pistons provide a reliable foundation for enhanced engine durability and power potential.

What's Included:

• Set of 8 DSS Racing FX Series +9cc Dome Top Forged Pistons
• Choice of full-floating or press-fit wrist pins (depending on SKU)
• Detailed specifications for compression ratio and fitment

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and performance tuners working on Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. It suits those seeking to increase compression ratios for improved power and throttle response while maintaining reliability in street, strip, or mild competition environments. The pistons are also well-suited for engine rebuilds requiring durable, high-quality components that meet or exceed OEM standards.

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.