DSS Racing Gen III Hemi FX Series Forged Piston Set

Fits Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Models

1-6820-4075 / 2-6820-4075 / 3-6820-4075 / K1-6820-4075 / K2-6820-4075 / K3-6820-4075

Overview:

The DSS Racing Gen III Hemi FX Series Forged Piston Set is engineered specifically for the 6.1L SRT8 engines found in Chrysler, Dodge, Jeep, and Ram vehicles. Designed to handle the rigors of high-performance applications, these pistons offer a perfect balance of strength, durability, and precision fitment. Whether you are rebuilding your engine or upgrading for increased power and reliability, this piston set provides a direct replacement solution that meets or exceeds OEM specifications.

Ideal for enthusiasts and professional builders alike, these pistons are crafted to optimize combustion efficiency and withstand elevated cylinder pressures, making them suitable for street performance, track use, and mild forced induction setups.

Key Features:

Built with advanced engineering and premium materials, the DSS Racing FX Series pistons deliver exceptional performance benefits:

• Compatible with 4.075" bore size for most Chrysler / Dodge / Jeep / Ram 6.1L SRT8 engines
• Forged construction for superior strength and durability under high stress
• Flat top design with a -1.5cc dish to optimize combustion chamber shape
• Comp height of 1.21" for precise piston-to-deck clearance
• Pin diameter of .984" with options for full-floating or press-fit pins
• Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate high-performance piston rings
• Stroke compatibility of 3.578" and connecting rod length of 6.243" for accurate engine geometry
• Available in multiple compression ratios approximately ranging from 9.0:1 to 11.11:1 depending on combustion chamber volume (65cc, 74cc, 85cc)
• Precision machining ensures optimal balance and minimal friction for improved engine efficiency

Construction & Design:

Each piston in the DSS Racing Gen III FX Series set is forged from high-grade aluminum alloy, providing an excellent strength-to-weight ratio essential for high-revving Hemi engines. The forging process enhances grain structure, resulting in pistons that resist cracking, scuffing, and thermal fatigue. The flat top design with a slight dish improves combustion dynamics, helping to maximize power output while maintaining reliable detonation resistance.

The pistons feature carefully engineered ring grooves and pin bosses to ensure secure ring seating and wrist pin retention, available in either full-floating or press-fit configurations to suit different engine builds and preferences. This attention to detail supports long-term durability and consistent performance under demanding conditions.

Installation & Fitment:

Designed as a direct fit replacement for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, these pistons simplify the rebuild or upgrade process. Minimal modifications are required when installing, provided the engine block is properly prepared and honed to the specified 4.075" bore size. The choice between full-floating or press-fit wrist pins allows customization based on builder preference and application requirements.

Professional installation is recommended to ensure correct piston ring end gaps, piston deck clearance, and overall engine assembly tolerances are maintained for optimal performance and longevity.

What's Included:

• Set of forged pistons for 4.075" bore size (quantity as per engine requirements)
• Wrist pins (full-floating or press-fit, depending on selected SKU)
• Piston rings compatible with 1.2/1.2/3mm groove dimensions (may be sold separately)
• Installation instructions and technical specifications

Ideal For:

• Engine builders upgrading or rebuilding Chrysler / Dodge / Jeep / Ram 6.1L SRT8 engines
• Performance enthusiasts seeking enhanced durability and power potential
• Street and track applications requiring reliable forged pistons
• Mild forced induction setups where OEM pistons may not provide sufficient strength
• Anyone needing a high-quality, precision-engineered piston set for Gen III Hemi engines

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.