DSS Racing FX Series Forged +4cc Dome Top Pistons Set

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

1-6807-4085 / 2-6807-4085 / 3-6807-4085 / K1-6807-4085 / K2-6807-4085 / K3-6807-4085

Overview:

The DSS Racing FX Series Forged +4cc Dome Top Pistons are precision-engineered performance components designed specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Built to enhance combustion efficiency and increase compression ratios, these pistons are ideal for enthusiasts seeking reliable power gains and durability in high-performance applications. Whether upgrading a street machine or building a race-ready engine, these pistons deliver consistent strength and improved engine response.

Featuring a +4cc dome top design, these pistons increase the combustion chamber volume to optimize compression ratios, allowing for better power output and throttle response. Their compatibility with the 425 Small Block Mopar Hemi Gen III platform ensures a direct fit and seamless integration with existing engine components.

Key Features:

Designed with performance and durability in mind, the DSS Racing FX Series pistons offer the following key features:

• Forged construction for superior strength and resistance to high-stress conditions
• +4cc dome top design to increase compression and improve combustion efficiency
• Comp height of 1.09" for optimal piston-to-head clearance and performance tuning
• Pin diameter of 0.927" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm for reliable sealing and reduced blow-by
• Designed for a 4.085" bore and 4.050" stroke, matching the 6.1L SRT8 engine specifications
• Rod length compatibility of 6.125" for precise piston-to-rod fitment
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 13.5:1 to 10.7:1

Construction & Design:

These pistons are forged from high-grade aluminum alloy, providing an excellent balance of lightweight design and exceptional strength. The forging process enhances the metal’s grain structure, resulting in pistons that withstand the extreme pressures and temperatures found in high-performance engines. The dome top shape is carefully engineered to optimize combustion chamber dynamics, improving flame propagation and power output.

The pistons feature precision-machined ring grooves and pin bores to ensure tight tolerances and reliable operation under demanding conditions. Their design supports both full-floating and press-fit wrist pin configurations, offering flexibility depending on engine build preferences.

Installation & Fitment:

These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines with a 4.085" bore. Installation requires standard engine assembly procedures, including proper ring end gap setting and wrist pin installation. Due to the +4cc dome volume, careful consideration of piston-to-head clearance and compression ratio is necessary to ensure optimal engine performance and avoid interference.

Professional installation is recommended to verify compatibility with existing components and to achieve precise engine tuning for maximum reliability and power gains.

What's Included:

• Set of four DSS Racing FX Series Forged +4cc Dome Top Pistons
• Wrist pins compatible with full-floating or press-fit installation
• Detailed specifications for bore, stroke, and compression ratios

Ideal For:

This piston set is ideal for performance enthusiasts and professional engine builders upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram 6.1L SRT8 engines. It suits applications ranging from street performance to track use, where increased compression and durability are desired. These pistons are perfect for those seeking to extract more power and efficiency from their Mopar Hemi Gen III platform while maintaining engine reliability.

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.