DSS Racing FX Series Forged Piston Set

Fits Chrysler, Dodge, Jeep, Ram 5.7L Hemi Models

1-6728-3947 / 2-6728-3947 / 3-6728-3947 / K1-6728-3947 / K2-6728-3947 / K3-6728-3947

Overview:

The DSS Racing FX Series +9cc Dome Top Forged Piston Set is engineered specifically for most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Hemi engine. Designed to enhance engine performance and durability, these pistons are ideal for enthusiasts and professional builders seeking reliable, high-quality components for their small block Mopar Hemi Gen III builds.

Featuring a +9cc dome top design, these pistons increase compression ratios, improving combustion efficiency and power output. Whether you are upgrading your engine for street performance, racing, or heavy-duty applications, the DSS Racing FX Series pistons deliver consistent strength and precision fitment.

Key Features:

Built with advanced engineering and precision manufacturing, these pistons offer several key benefits:

• Forged construction for superior strength and resistance to high-stress conditions
• +9cc dome top design to increase compression ratio and optimize combustion
• Comp height of 1.21" for compatibility with stock and aftermarket components
• Pin diameter of .945" with options for full-floating or press-fit installation
• Ring groove dimensions of 1.2mm/1.2mm/3mm for reliable ring sealing and durability
• Designed for a 3.578" stroke and 6.243" connecting rod length, matching factory specifications
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.53:1 to 12.19:1
• Precision CNC machining ensures tight tolerances and consistent performance

Construction & Design:

Each piston in the DSS Racing FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight strength and thermal conductivity. The dome top design is carefully engineered to optimize combustion chamber shape and improve flame propagation, resulting in better power delivery and efficiency.

The pistons feature ring grooves machined to accommodate high-performance piston rings, ensuring effective sealing under extreme conditions. The wrist pin bore is designed for either full-floating or press-fit pins, allowing flexibility depending on engine build preferences. Overall, the construction emphasizes durability, precision, and compatibility with the 5.7L Hemi’s architecture.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, making it a direct replacement for stock pistons in these applications. Installation requires standard engine assembly procedures, and the pistons are compatible with factory connecting rods and crankshafts matching the specified stroke and rod length.

Builders should verify compression ratio targets based on combustion chamber volume and piston dome size to ensure optimal engine performance. No major modifications are typically necessary, but professional installation is recommended to maintain engine reliability and performance.

What's Included:

• Set of forged +9cc dome top pistons (quantity as per engine requirements)
• Wrist pins compatible with full-floating or press-fit installation
• Detailed specifications for ring groove sizes and piston dimensions

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines. It suits applications ranging from street performance upgrades to competitive motorsports where increased compression and durability are critical.

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.