DSS Racing FX Series Forged Piston Set

Chrysler / Dodge / Jeep / Ram 6.4L 392 Gen III Hemi

1-6833-4125 / 2-6833-4125 / 3-6833-4125 / K1-6833-4125 / K2-6833-4125 / K3-6833-4125

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines. Designed to replace factory pistons, this set offers enhanced strength and durability for high-performance and racing applications. Ideal for enthusiasts and professional builders seeking reliable, lightweight pistons that maintain optimal compression and withstand extreme conditions.

These pistons are precision forged to exacting standards, ensuring consistent quality and fitment. With a 4.125" bore size and a compact dish design, they provide excellent combustion efficiency and support aggressive tuning setups.

Key Features:

Built to deliver superior performance and longevity, the DSS Racing FX Series Forged Pistons include the following key features:

• Compatible with 6.4L 392 Gen III Hemi engines from Chrysler, Dodge, Jeep, and Ram
• 4.125" bore diameter optimized for 398 Small Block Mopar Hemi Gen III applications
• Compact 12cc dish top design for improved combustion and compression control
• Forged construction for enhanced strength and resistance to detonation
• Pin diameter of .945" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable sealing and reduced friction
• Designed for use with a 3.720" stroke and 6.2" connecting rods
• Available in multiple compression heights (65cc, 74cc, 85cc) to achieve approximate compression ratios of 10.51, 9.61, and 8.71 respectively
• Precision machined for consistent fit and performance in high-stress environments

Construction & Design:

The FX Series pistons are crafted from high-grade forged aluminum alloy, providing an optimal balance of strength and lightweight characteristics. This construction improves engine responsiveness and reduces reciprocating mass, which is critical for high RPM durability. The pistons feature a carefully engineered dish top with a -12cc volume to optimize combustion chamber shape and compression ratio, enhancing power output and efficiency.

Each piston is designed with precise ring grooves to accommodate high-performance piston rings, ensuring excellent sealing and minimizing blow-by. The wrist pin bore supports either full-floating or press-fit pins, allowing builders to tailor the setup to their specific engine requirements.

Installation & Fitment:

These pistons are direct fit replacements for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines. Installation requires standard engine assembly procedures, with attention to proper ring end gap and wrist pin fitment based on the selected configuration. No major modifications are necessary when upgrading from factory pistons, making them suitable for both rebuilds and performance upgrades.

What's Included:

• Set of four DSS Racing FX Series forged pistons with 4.125" bore
• Wrist pin options for full-floating or press-fit installation
• Detailed specifications for compression height and dish volume

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers who demand reliable, high-strength components for the Mopar 6.4L 392 Gen III Hemi platform. Whether upgrading for increased power, durability, or engine rebuilds, these pistons provide a solid foundation for enhanced engine performance and longevity.

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.