DSS Racing FX Series Forged Piston Set

2005–2010 Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Models

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

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the 6.1L Gen III Mopar Hemi engines found in most Chrysler, Dodge, Jeep, and Ram SRT8 models. Designed to replace factory cast pistons, these forged pistons offer superior strength and durability, making them an ideal upgrade for enthusiasts seeking enhanced engine reliability and performance under demanding conditions.

Whether you are building a high-performance street machine or a track-focused vehicle, these pistons provide the necessary robustness to handle increased power levels and aggressive tuning. Their precise specifications ensure compatibility and optimal combustion chamber dynamics, maintaining factory-like drivability while supporting higher compression ratios.

Key Features:

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

• Forged construction for maximum strength and resistance to detonation
• Comp height of 1.21 inches for precise deck clearance and piston-to-head fitment
• 18cc dish top design to optimize combustion chamber volume and compression ratio
• .927-inch wrist pin diameter supporting full-floating or press-fit installation
• Ring groove dimensions of 1.2mm top and second rings, and 3mm oil ring for effective sealing
• Compatible with 3.578-inch stroke crankshafts and 6.243-inch connecting rods
• Available in multiple dish volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.31:1 down to 7.82:1
• Designed specifically for the 371 Small Block Mopar Hemi Gen III engine architecture

Construction & Design:

Each piston in the FX Series is crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight strength and thermal conductivity. The forging process enhances the grain structure of the metal, resulting in superior fatigue resistance and durability compared to standard cast pistons.

The -18cc dish top design reduces the compression ratio to accommodate forced induction or higher boost levels, while the precise ring grooves ensure optimal ring sealing and oil control. The pistons are engineered to fit the Gen III Mopar Hemi’s unique bore and stroke dimensions, ensuring a perfect fit and smooth operation within the cylinder bore.

Installation & Fitment:

This piston set is a direct fit replacement for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines equipped with the Gen III Mopar Hemi platform. Installation requires standard engine rebuild procedures, including proper honing and cleaning of the cylinder bores. The wrist pins can be installed as either full-floating or press-fit, depending on your engine build preferences.

Due to the different dish volumes available, builders can select the piston that best matches their desired compression ratio and engine setup. Professional installation is recommended to ensure optimal piston ring end gap and clearance specifications are met.

What's Included:

• Set of forged pistons (quantity as per engine requirements)
• Wrist pins compatible with full-floating or press-fit installation
• Detailed specifications for compression ratio and piston dimensions

Ideal For:

The DSS Racing FX Series Forged Piston Set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding 6.1L Gen III Mopar Hemi engines. It suits applications ranging from street performance to track and drag racing, especially where increased strength and reliability are critical under high-stress conditions.

These pistons are perfect for those seeking to improve engine durability while maintaining or adjusting compression ratios for forced induction or naturally aspirated 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.