DSS Racing FX Series Forged Piston Set

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

1-6847-4085 / 2-6847-4085 / 3-6847-4085 / K1-6847-4085 / K2-6847-4085 / K3-6847-4085

Overview:

The DSS Racing 6.1 Stroker Gen III Hemi FX Series Forged Piston Set is engineered for enthusiasts and professional builders seeking enhanced durability and performance for their Chrysler, Dodge, Jeep, or Ram 6.1L SRT8 engines. Designed specifically for the 375 Small Block Mopar Hemi Gen III platform, these pistons accommodate stroker builds with a 3.578" stroke and offer a range of compression ratios to suit various performance goals.

Whether you are upgrading for increased power output, reliability under high boost, or extended engine life, this piston set provides a precision fit and superior strength to handle demanding conditions. The +4cc dome top design and multiple compression ratio options allow for fine-tuning combustion characteristics to match your build requirements.

Key Features:

Built with performance and reliability in mind, the DSS Racing FX Series Forged Pistons offer the following key features:

• Compatible with most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 Gen III Hemi engines
• Forged construction for maximum strength and durability under high stress
• +4cc dome top design to optimize combustion chamber volume and compression ratio
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm top and second rings, 3mm oil ring for effective sealing
• Stroke length of 3.578" and rod length of 6.243" to support stroker engine builds
• Available compression ratios approximately 12.03:1 (65cc), 10.77:1 (74cc), and 9.57:1 (85cc) for tuning flexibility
• Designed for compatibility with 375 Small Block Mopar Hemi Gen III engines

Construction & Design:

The pistons are crafted from high-quality forged aluminum alloy, delivering an optimal balance of lightweight strength and thermal conductivity. This construction ensures resistance to cracking and deformation under extreme combustion pressures and temperatures. The +4cc dome top enhances combustion efficiency by increasing chamber volume, while the precision-machined ring grooves maintain excellent ring seal and reduce blow-by.

The pin bore is engineered to accept either full-floating or press-fit wrist pins, allowing builders to select the best option for their application. The piston skirt and crown are designed to minimize friction and wear, contributing to improved engine longevity and performance consistency.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines equipped with the Gen III Hemi platform. Installation requires standard engine assembly procedures and may necessitate professional machining to ensure proper clearances and ring end gaps based on your specific build. The pistons are compatible with stroker crankshafts featuring a 3.578" stroke and connecting rods measuring 6.243" in length.

Proper installation ensures optimal piston-to-cylinder wall clearance and ring seal, critical for achieving the intended compression ratios and engine performance.

What's Included:

• Set of forged pistons (quantity as required for engine configuration)
• Wrist pin compatibility for full-floating or press-fit installation
• Precision-machined ring grooves for 1.2mm top and second rings, 3mm oil ring
• Technical specifications and installation guidelines

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram 6.1L SRT8 engines. It suits stroker engine projects, forced induction builds, and naturally aspirated setups requiring enhanced durability and tailored compression ratios. Whether building a street performance engine or a track-focused powerplant, these pistons provide the strength and precision needed for reliable high-performance operation.

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.