DSS Racing FX Series Forged Piston Set

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

1-6820-4065 / 2-6820-4065 / 3-6820-4065 / K1-6820-4065 / K2-6820-4065 / K3-6820-4065

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 meet the demands of high-performance builds, these pistons deliver exceptional strength and durability while maintaining precise fitment and optimal combustion characteristics. Whether you are rebuilding your engine or upgrading for increased power and reliability, this piston set offers a reliable foundation for your performance goals.

These pistons are ideal for enthusiasts and professional builders seeking a high-quality forged piston solution that balances lightweight design with robust construction. The set is compatible with the 371 Small Block Mopar Hemi Gen III platform and is tailored to maintain factory-like compression ratios with options to suit various combustion chamber volumes.

Key Features:

Built with advanced engineering and precision manufacturing, the DSS Racing FX Series pistons include the following features:

• Compatible with 4.065" bore size for most 6.1L SRT8 engines
• Forged construction for superior strength and durability under high stress
• Flat top piston design with a -1.5cc dish for optimized combustion
• Comp height of 1.21" for precise piston-to-deck clearance
• .984" wrist pin diameter with options for full-floating or press-fit pins
• Ring groove dimensions of 1.2mm top and second rings, 3mm oil ring for effective sealing
• Stroke compatibility of 3.578" and connecting rod length of 6.243" for balanced engine geometry
• Available compression ratio options approximately 11.06:1 (65cc), 9.99:1 (74cc), and 8.95:1 (85cc) to suit different build requirements

Construction & Design:

The DSS Racing FX Series pistons are crafted from high-grade forged aluminum alloy, providing an excellent strength-to-weight ratio essential for high-performance applications. The forging process enhances the metal’s grain structure, resulting in pistons that resist cracking, scuffing, and thermal fatigue even under extreme operating conditions.

Each piston is precision-machined to exact tolerances, ensuring consistent ring groove dimensions and piston skirt finish for reduced friction and improved wear resistance. The flat top design with a slight dish optimizes combustion efficiency and helps maintain factory compression ratios, making these pistons suitable for both naturally aspirated and forced induction setups.

Installation & Fitment:

Designed as a direct fit replacement for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, these pistons require minimal modifications during installation. The set supports both full-floating and press-fit wrist pin configurations, allowing flexibility depending on your engine build preferences.

Proper ring end gap and piston-to-wall clearance should be verified during installation to ensure optimal performance and longevity. These pistons are compatible with the 371 Small Block Mopar Hemi Gen III platform, making them a straightforward upgrade or rebuild component for enthusiasts and professional engine builders alike.

What's Included:

• Set of forged pistons (quantity as required for engine configuration)
• Wrist pins compatible with full-floating or press-fit installation
• Precision-machined piston rings with specified groove dimensions
• Installation guidelines and specifications for compression ratios and clearances

Ideal For:

This piston set is perfect for performance enthusiasts, professional engine builders, and racers who demand reliable, high-strength components for their 6.1L SRT8 engines. Whether you are performing a high-performance rebuild, upgrading for forced induction, or seeking improved durability for street or track use, the DSS Racing FX Series pistons provide a solid foundation for enhanced 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.