DSS Racing FX Series Forged Pistons

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6845-4090D / 2-6845-4090D / 3-6845-4090D / K1-6845-4090D / K2-6845-4090D / K3-6845-4090D

Overview:

The DSS Racing FX Series Forged Pistons are precision-engineered performance components designed specifically for the 6.1L Gen III Mopar Hemi engines found in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models. These pistons offer a perfect blend of strength, durability, and lightweight construction to handle the rigors of high-performance driving and racing applications.

Built to exacting standards, these pistons feature a compact dish top design with a -18cc volume, optimized for efficient combustion and improved compression ratios. Whether you are upgrading your engine for street performance or track use, the FX Series pistons provide reliable power gains and enhanced engine longevity.

Key Features:

Designed for enthusiasts and professional builders alike, the DSS Racing FX Series Forged Pistons deliver advanced technology and robust construction:

• Compatible with 6.1L Gen III Mopar Hemi engines used in Chrysler, Dodge, Jeep, and Ram SRT8 models
• Compacted height of 1.21 inches for optimal piston-to-deck clearance
• 18cc dish top design to optimize combustion chamber volume and compression ratio
• Pin diameter of 0.927 inches, available in full-floating or press-fit configurations
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring for superior sealing
• Stroke compatibility of 3.578 inches and connecting rod length of 6.243 inches
• Approximate compression ratios available: 9.41:1 (65cc), 8.65:1 (74cc), and 7.9:1 (85cc) for tuning flexibility
• Forged from high-strength alloy for enhanced durability under high stress and elevated temperatures

Construction & Design:

The FX Series pistons are crafted using advanced forging techniques that ensure uniform grain structure and superior mechanical properties. This process results in pistons that resist cracking, scuffing, and thermal fatigue, even under extreme operating conditions. The forged alloy material provides an excellent strength-to-weight ratio, reducing reciprocating mass and improving engine responsiveness.

The pistons feature a carefully engineered dish top design with a precise volume to optimize combustion efficiency and control detonation. The ring grooves are machined to tight tolerances to accommodate high-performance piston rings, ensuring excellent sealing and oil control. Additionally, the wrist pin options allow for customization based on engine build preferences and durability requirements.

Installation & Fitment:

These DSS Racing FX Series Forged Pistons are direct replacements for factory pistons in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Installation requires standard engine rebuilding procedures and may involve balancing and blueprinting for optimal performance. The pistons are compatible with the factory stroke and rod length specifications, minimizing the need for additional modifications.

Professional installation is recommended to ensure proper ring end gap, piston-to-wall clearance, and wrist pin fitment. These pistons are ideal for engine builders seeking reliable, high-quality components for naturally aspirated or forced induction applications.

What's Included:

• Set of 8 DSS Racing FX Series Forged Pistons
• Wrist pins (full-floating or press-fit options depending on SKU)
• Installation instructions and technical specifications

Ideal For:

The DSS Racing FX Series Forged Pistons are perfect for performance enthusiasts, engine builders, and racers who demand durable, high-strength pistons for their 6.1L Mopar Hemi engines. Whether upgrading a street machine, preparing a track car, or building a reliable powerplant for daily driving, these pistons provide the foundation for improved power, efficiency, and engine 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.