DSS Racing FX Series Forged Piston Set

2005–Present Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6845-4075 / 2-6845-4075 / 3-6845-4075 / K1-6845-4075 / K2-6845-4075 / K3-6845-4075

Overview:

The DSS Racing 6.1 Stroker Small Block Mopar Hemi Gen III FX Series Forged Piston Set is engineered for enthusiasts and professional builders seeking enhanced durability and performance for their 6.1L SRT8 engines. Designed to fit most Chrysler, Dodge, Jeep, and Ram models equipped with the 6.1L Hemi, this piston set is ideal for stroker builds and high-performance applications. With a focus on strength and precision, these pistons provide reliable operation under demanding conditions while supporting increased power output and engine longevity.

Whether you are upgrading your engine for street performance, track use, or custom builds, these forged pistons offer the quality and specifications needed to maximize your 6.1L Hemi’s potential.

Key Features:

Built to meet the rigorous demands of high-performance Mopar engines, the DSS Racing FX Series pistons include:

• Forged construction for superior strength and durability compared to cast pistons
• Compensated dish top design with an -18cc dish volume to optimize compression ratios
• Pin diameter of .927" compatible with full-floating or press-fit wrist pins
• Ring groove dimensions of 1.2mm/1.2mm/3mm for reliable ring sealing and reduced friction
• Designed for a 3.578" stroke and 6.243" connecting rod length, matching stroker build specifications
• Available in multiple compression volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 7.85:1 to 9.34:1
• Precision machining ensures consistent piston-to-cylinder wall clearance and optimal fitment
• Compatible with the 373 Small Block Mopar Hemi Gen III platform

Construction & Design:

These pistons are 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 pistons that resist cracking and deformation under high combustion pressures and temperatures. The dish top design reduces compression to accommodate forced induction or higher boost levels while maintaining efficient combustion chamber dynamics.

Each piston features precision-machined ring grooves and pin bores to ensure proper ring seal and wrist pin fitment, critical for maintaining engine efficiency and durability. The design supports either full-floating or press-fit wrist pins, allowing flexibility depending on your build preferences.

Installation & Fitment:

The DSS Racing FX Series Forged Piston Set is engineered for direct fitment in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, including stroker configurations with a 3.578" stroke. Installation requires standard engine assembly procedures, and it is recommended to verify clearances and ring end gaps during installation. These pistons are compatible with existing Gen III Hemi components, but professional installation is advised to ensure optimal performance and reliability.

What's Included:

• Set of forged pistons (quantity as required for engine configuration)
• Precision-machined piston rings installed in grooves
• Wrist pin compatibility for full-floating or press-fit applications
• Technical specifications and installation guidelines

Ideal For:

This piston set is ideal for engine builders, performance enthusiasts, and racers upgrading or rebuilding 6.1L Mopar Hemi engines. It suits stroker builds, forced induction setups, and naturally aspirated applications requiring enhanced strength and tailored compression ratios. Whether upgrading for street performance, drag racing, or track use, these pistons provide a reliable foundation for increased power and durability.

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.