DSS Racing FX Series Gen III Hemi Forged Piston Set

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

1-6830-4090 / 2-6830-4090 / 3-6830-4090 / K1-6830-4090 / K2-6830-4090 / K3-6830-4090

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. Designed to replace factory pistons, this set offers enhanced durability and performance for enthusiasts seeking reliable power gains and long-lasting engine integrity. Whether you're building a high-performance street machine or a track-ready build, these forged pistons provide the strength and precision needed to handle increased cylinder pressures and elevated RPMs.

Featuring a 4.090" bore size and a compact 1.21" compression height, these pistons are optimized for the Gen III Hemi small block architecture. Their flat-top design with a -1.5cc dish volume allows for fine-tuning compression ratios to suit various combustion chamber sizes and fuel types, making them versatile for multiple performance applications.

Key Features:

These DSS Racing forged pistons incorporate advanced engineering to deliver superior performance and reliability:

• Compatible with Chrysler / Dodge / Jeep / Ram 6.4L 392 Gen III Hemi engines
• 4.090" bore diameter for precise fitment in factory cylinders
• Forged construction for enhanced strength and resistance to detonation
• Flat-top piston design with -1.5cc dish for optimized combustion
• Compression height of 1.21" tailored for Gen III small block Hemi architecture
• .945" wrist pin diameter with options for full-floating or press-fit installation
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable ring sealing
• Stroke compatibility of 3.720" and connecting rod length of 6.2" for balanced piston-to-rod geometry
• Available in multiple dish volumes to achieve approximate compression ratios of 11.6:1 (65cc), 10.47:1 (74cc), and 9.38:1 (85cc)

Construction & Design:

Each piston in the DSS Racing FX Series is crafted from high-grade forged aluminum alloy, delivering exceptional strength-to-weight ratio and thermal conductivity. The forging process refines the grain structure of the metal, resulting in pistons that withstand the rigors of high-performance combustion environments without compromising durability.

The pistons feature precision-machined ring grooves and skirt profiles to minimize friction and wear, while the flat-top design promotes efficient combustion and consistent power delivery. The wrist pin bore is engineered for either full-floating or press-fit configurations, allowing builders to select the optimal setup for their application.

Installation & Fitment:

This piston set is designed as a direct replacement for most Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines with a 4.090" bore. Installation requires standard engine assembly procedures and may involve balancing and blueprinting for optimal performance. No major modifications to the block or connecting rods are typically necessary, but professional installation is recommended to ensure proper clearances and ring end gaps.

What's Included:

• Set of forged pistons sized for 4.090" bore
• Wrist pins compatible with full-floating or press-fit installation
• Precision-machined piston rings (1.2mm top and second rings, 3mm oil ring)
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for performance enthusiasts and engine builders upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram 6.4L 392 engines. It suits applications ranging from street performance to drag racing and road course use where increased durability and compression tuning are required. The versatility in compression ratios makes it suitable for various fuel types and forced induction setups.

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.