DSS Racing FX Series Forged Piston Set

Chrysler / Dodge / Jeep / Ram 6.4L 392 Models

1-6845-4100C / 2-6845-4100C / 3-6845-4100C / K1-6845-4100C / K2-6845-4100C / K3-6845-4100C

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for high-performance applications in Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.4L 392 HEMI engine. Designed to fit most 6.4L 392 models, these pistons offer a precise 4.100" bore size and are built to withstand the rigors of aggressive street driving, track use, and racing environments.

Crafted for enthusiasts and professional builders alike, this piston set enhances engine durability and reliability while supporting increased power output. The FX Series pistons are an ideal upgrade for those seeking to improve engine efficiency, reduce reciprocating mass, and maintain tight tolerances under high stress.

Key Features:

These forged pistons incorporate advanced design elements and manufacturing techniques to deliver superior performance and longevity:

• Compatible with 393 Small Block Mopar HEMI Gen III engines
• Compacted height of 1.21" for optimized piston-to-deck clearance
• 18cc dish top design to control compression ratio and combustion dynamics
• .927" wrist pin diameter available in full-floating or press-fit configurations
• Precision ring grooves sized at 1.2mm (top and second) and 3mm (oil ring) for excellent sealing
• Stroke length of 3.720" matched to a 6.2" connecting rod for balanced performance
• Approximate compression ratios tailored to combustion chamber volumes: 65cc (9.79), 74cc (9.0), and 85cc (8.21)
• Forged from high-strength materials to resist heat and mechanical stress

Construction & Design:

The DSS Racing FX Series pistons are forged from premium-grade aluminum alloy, providing an ideal balance of strength, weight, and thermal conductivity. The forging process ensures a dense, uniform grain structure that enhances fatigue resistance and durability under extreme operating conditions.

Each piston features a carefully engineered dish top with an 18cc volume reduction to optimize combustion chamber shape and reduce detonation risk. The wrist pin bore is precision-machined to accommodate either full-floating or press-fit pins, allowing builders to customize assembly based on application needs. Ring grooves are designed to maintain ring seal integrity while minimizing friction and wear.

Installation & Fitment:

This piston set is designed for direct fitment in most Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines, making it a straightforward upgrade for engine rebuilds or performance enhancements. Installation requires standard machining and assembly procedures consistent with high-performance engine builds. Proper ring end gap and piston-to-wall clearance should be verified during installation to ensure optimal operation and longevity.

What's Included:

• Set of forged pistons with 4.100" bore size
• Wrist pin options: full-floating or press-fit
• Precision-machined ring grooves ready for standard piston rings
• Detailed specifications for compression ratios and piston dimensions

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers who demand reliable, high-strength components for their 6.4L 392 HEMI-powered vehicles. Whether upgrading a street machine, preparing a drag or road racing engine, or building a durable daily driver with enhanced power, the DSS Racing FX Series pistons provide the foundation for improved 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.