DSS Racing FX Series Forged Piston Set

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

1-6833-4090 / 2-6833-4090 / 3-6833-4090 / K1-6833-4090 / K2-6833-4090 / K3-6833-4090

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines, delivering exceptional strength and durability for high-performance applications. Designed to fit most 6.4L 392 models, these pistons offer a precise 4.090" bore size and are ideal for enthusiasts and professional builders seeking reliable, race-ready components.

Built to withstand the rigors of aggressive street driving, track use, and motorsports, this piston set enhances engine efficiency and longevity. The FX Series pistons provide a perfect balance of lightweight construction and robust design, helping to improve throttle response and overall engine performance.

Key Features:

These forged pistons incorporate advanced design elements and manufacturing techniques to meet the demands of high-output Mopar HEMI engines:

• Compatible with 391 Small Block Mopar HEMI Gen III engines
• Comp Height: 1.21" for optimal piston-to-head clearance
• 12cc dish top design to control compression and combustion characteristics
• Pin diameter: .945" with options for full-floating or press-fit configurations
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring for superior sealing
• Stroke compatibility: 3.720" stroke engines
• Connecting rod length: 6.2" for balanced piston travel and engine geometry
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios from 8.59:1 to 10.36:1
• Precision forged for enhanced strength and fatigue resistance

Construction & Design:

DSS Racing FX Series pistons are crafted from high-grade forged aluminum alloy, ensuring superior strength-to-weight ratio and excellent thermal conductivity. The forging process refines the grain structure of the metal, resulting in pistons that resist cracking and deformation under extreme heat and pressure.

The pistons feature a carefully engineered dish top design with a -12cc volume to optimize combustion chamber shape and reduce detonation risk. The pin bosses are reinforced to accommodate either full-floating or press-fit wrist pins, providing flexibility for various engine builds and performance goals.

Installation & Fitment:

This piston set is designed for direct fitment in most Chrysler, Dodge, Jeep, and Ram 6.4L 392 engines, making it a straightforward upgrade for engine rebuilds or performance enhancements. Installation requires standard machining checks and clearances to ensure proper ring seal and piston-to-cylinder wall fitment.

Builders should verify compatibility with their specific engine configuration, including stroke and rod length, to achieve optimal performance and reliability. Professional installation is recommended to maintain engine integrity and warranty compliance.

What's Included:

• Set of forged pistons with 4.090" bore size
• Wrist pin options: full-floating or press-fit (depending on selection)
• Precision-machined ring grooves for 1.2mm top and second rings, 3mm oil ring
• Detailed specifications and installation guidelines

Ideal For:

This piston set is ideal for Mopar enthusiasts, engine builders, and racers looking to upgrade their 6.4L 392 HEMI engines with durable, high-performance components. Whether building a street/strip machine, a track-focused vehicle, or a high-output daily driver, the DSS Racing FX Series pistons provide the strength and precision needed to maximize engine potential.

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.