DSS Racing FX Series Gen III Hemi Forged Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 6.4L 392 Models

1-6830-4125 / 2-6830-4125 / 3-6830-4125 / K1-6830-4125 / K2-6830-4125 / K3-6830-4125

Overview:

The DSS Racing FX Series Gen III Hemi Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 engines, including the popular 398 Small Block Mopar Hemi Gen III platform. Designed for enthusiasts and professional builders seeking enhanced durability and performance, these pistons offer a reliable upgrade for high-output applications. Whether you are rebuilding your engine or upgrading for increased power and longevity, this piston set delivers precision and strength to meet demanding conditions.

With a bore size of 4.125 inches and a compact flat-top design, these pistons optimize combustion efficiency and compression ratios, making them ideal for street performance, racing, and high-performance builds. The set is compatible with both full-floating and press-fit wrist pins, providing flexibility for various engine configurations.

Key Features:

These forged pistons incorporate advanced design elements and materials to ensure superior performance and reliability:

• Forged construction for maximum strength and durability under high stress
• 1.21" compression height optimized for Gen III Hemi engines
• 1.5cc flat-top design to fine-tune compression ratios
• .945" wrist pin diameter compatible with full-floating or press-fit setups
• Precision ring grooves sized at 1.2mm / 1.2mm / 3mm for optimal ring seal and reduced friction
• Designed for a 3.720" stroke and 6.2" rod length combination
• Available in multiple combustion chamber volume options (65cc, 74cc, 85cc) to adjust compression ratios from approximately 9.52:1 to 11.77:1
• Compatible with most Chrysler / Dodge / Jeep / Ram 6.4L 392 engine builds

Construction & Design:

DSS Racing utilizes high-grade forged aluminum alloy to manufacture these pistons, ensuring exceptional strength-to-weight ratio and resistance to thermal and mechanical stress. The pistons are CNC-machined to exacting tolerances, providing consistent fitment and performance. The flat-top design with a slight volume offset (-1.5cc) allows for precise compression ratio tuning, which is critical for optimizing power output and engine efficiency.

The ring grooves are engineered to accommodate performance ring sets, maintaining excellent sealing under high cylinder pressures. The wrist pin bore supports both full-floating and press-fit pins, offering versatility depending on engine build preferences. This combination of materials and design features results in pistons that withstand the rigors of high-performance and forced induction applications.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines, making it a direct replacement for stock pistons in these platforms. Installation requires standard engine assembly procedures, and the pistons are compatible with existing rods and rings designed for the specified dimensions. Builders should verify bore size and clearances to ensure proper fitment and performance.

Due to the precision manufacturing and compatibility with common wrist pin configurations, these pistons simplify the rebuild or upgrade process without requiring extensive modifications.

What's Included:

• Set of four forged pistons with 4.125" bore diameter
• Precision-machined ring grooves
• Compatible wrist pin bores for full-floating or press-fit pins

Ideal For:

• Performance engine builders upgrading Chrysler / Dodge / Jeep / Ram 6.4L 392 engines
• Enthusiasts seeking durable forged pistons for street and track use
• Rebuild projects requiring reliable, high-quality piston replacements
• Applications demanding optimized compression ratios for 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.