DSS Racing FX Series Forged Pistons

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6847-4090D / 2-6847-4090D / 3-6847-4090D / K1-6847-4090D / K2-6847-4090D / K3-6847-4090D

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 SRT8 models. These pistons offer a perfect balance of strength, durability, and lightweight construction, making them an ideal upgrade for enthusiasts seeking enhanced engine reliability and power potential.

Built to withstand the rigors of high-performance applications, the FX Series pistons deliver improved combustion efficiency and thermal management. Whether you are building a street performance engine or a track-focused machine, these pistons provide the foundation for consistent, high-output operation.

Key Features:

Engineered with advanced design and manufacturing techniques, the DSS Racing FX Series Forged Pistons include the following key features:

• Forged from high-strength aluminum alloy for superior durability and reduced weight
• +4cc dome top design to optimize compression and combustion chamber shape
• Comp height of 1.21" for precise piston-to-deck clearance and performance tuning
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate high-performance piston rings
• Compatible with 3.578" stroke and 6.243" connecting rods for exact fitment
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios from 9.59:1 up to 12.06:1
• Designed specifically for the 376 cubic inch Small Block Mopar Gen III Hemi platform

Construction & Design:

The DSS Racing FX Series pistons are crafted from premium forged aluminum alloy, providing an excellent strength-to-weight ratio essential for high-revving engines. The forging process enhances grain structure and mechanical properties, resulting in pistons that resist cracking and deformation under extreme heat and pressure.

The dome top design with a +4cc volume improves combustion efficiency by promoting better flame propagation and reducing detonation risk. Precision machining ensures tight tolerances for optimal ring sealing and minimal friction. The option for full-floating or press-fit wrist pins allows customization based on engine build preferences and durability requirements.

Installation & Fitment:

These pistons are designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models equipped with the Gen III Mopar Hemi engine. Installation requires standard engine assembly procedures and may involve balancing and blueprinting for best results. The pistons are compatible with factory stroke and rod lengths, ensuring a straightforward swap in performance rebuilds or upgrades.

Professional installation is recommended to verify clearances and ring end gaps, especially when selecting different combustion chamber volumes to adjust compression ratios.

What's Included:

• Set of forged pistons (quantity as per engine requirements)
• Wrist pins (full-floating or press-fit options depending on SKU)
• Ring grooves pre-machined for high-performance piston rings
• Technical specifications and installation guidelines

Ideal For:

The DSS Racing FX Series Forged Pistons are ideal for automotive enthusiasts, engine builders, and racers who demand reliable, high-performance components for their 6.1L Mopar Hemi engines. Whether upgrading a street machine, building a drag racer, or preparing a track car, these pistons provide the strength and precision needed to maximize power 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.