DSS Racing FX Series Forged Piston Set

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6845-4065D / 2-6845-4065D / 3-6845-4065D / K1-6845-4065D / K2-6845-4065D / K3-6845-4065D

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, based on the Gen III Hemi platform. Designed to replace factory pistons, this set is ideal for enthusiasts and professional builders seeking enhanced durability and performance in high-output applications. Whether you are upgrading for street performance, track use, or forced induction builds, these pistons provide the strength and precision needed to handle increased power and demanding conditions.

Featuring a compact dish top design and optimized compression ratios, the FX Series pistons help maintain efficient combustion and power delivery while supporting engine reliability under stress. Their compatibility with the 371 Small Block Mopar Hemi Gen III architecture ensures a seamless fit with minimal modifications.

Key Features:

The DSS Racing FX Series Forged Pistons combine advanced engineering and quality materials to deliver superior performance and longevity. Key features include:

• Forged construction for maximum strength and resistance to detonation
• Comp height of 1.21 inches for precise piston-to-head clearance
• 18cc dish top design to optimize combustion chamber volume and compression ratio
• .927 inch wrist pin diameter 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 a 3.578 inch stroke and 6.243 inch connecting rods
• Available in multiple compression ratios to suit different build goals: 65cc (9.31:1), 74cc (8.57:1), and 85cc (7.82:1)
• Precision CNC machining for tight tolerances and consistent performance
• Designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines without extensive modification

Construction & Design:

Each piston in the FX Series set is forged from high-grade aluminum alloy, providing an excellent balance of strength, weight, and thermal conductivity. The forging process enhances the metal grain structure, resulting in pistons that resist cracking, scuffing, and deformation under extreme heat and pressure. The dish top design reduces compression volume, allowing for tuning flexibility and improved knock resistance.

The pistons feature a durable skirt coating to reduce friction and wear, while the ring grooves are machined to exact specifications to ensure optimal ring seal and longevity. The wrist pin bore supports either full-floating or press-fit pins, giving builders options based on their engine setup and performance requirements.

Installation & Fitment:

The DSS Racing FX Series Forged Pistons are designed as direct replacements for factory pistons in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Installation requires standard engine assembly procedures, including proper ring end gap setting and piston orientation. Depending on the wrist pin option selected, either full-floating or press-fit installation methods apply.

These pistons are compatible with the Gen III Hemi 371 Small Block architecture and work seamlessly with stock or upgraded connecting rods and crankshafts. Builders should verify clearances and compression ratios based on their specific engine build and intended use.

What's Included:

• Complete set of forged pistons for all cylinders
• Wrist pins (full-floating or press-fit, depending on option)
• Piston rings sized for 1.2mm top and second rings, and 3mm oil ring groove
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding their 6.1L SRT8 engines. It suits naturally aspirated builds seeking improved strength and reliability, as well as forced induction applications requiring pistons capable of handling increased cylinder pressures. Whether upgrading for street, strip, or track, the DSS Racing FX Series pistons provide a solid foundation for high-performance Mopar builds.

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.