DSS Racing FX Series Forged +4cc Dome Top Pistons

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6807-4065 / 2-6807-4065 / 3-6807-4065 / K1-6807-4065 / K2-6807-4065 / K3-6807-4065

Overview:

The DSS Racing FX Series Forged +4cc Dome Top Pistons are precision-engineered performance components designed specifically for Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Crafted to enhance combustion efficiency and power output, these pistons feature a +4cc dome top design that increases compression ratios, delivering improved throttle response and overall engine performance.

Ideal for enthusiasts and professional builders seeking durable, high-strength pistons for naturally aspirated or mildly boosted applications, these pistons offer a reliable upgrade over factory cast components. Their compatibility with the 420 Small Block Mopar Hemi Gen III platform ensures a perfect fit and optimal performance gains.

Key Features:

Engineered with advanced design and manufacturing techniques, the DSS Racing FX Series pistons provide a balance of strength, weight savings, and thermal efficiency. Key features include:

• +4cc dome top design to increase compression ratio and combustion efficiency
• Forged construction for superior strength and durability under high-stress conditions
• Compatible with 4.065" bore size and 4.050" stroke engines
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm top and second rings, and 3mm oil ring groove for optimal sealing
• Comp height of 1.09" for precise piston-to-deck clearance
• Designed for use with 6.125" connecting rods
• Available in multiple combustion chamber volume options (65cc, 74cc, 85cc) to tailor compression ratios from approximately 10.62:1 to 13.38:1
• Ideal for high-performance street and track applications

Construction & Design:

These pistons are forged from premium-grade aluminum alloy, providing an excellent strength-to-weight ratio essential for high-revving engines. The dome top design is CNC-machined to exacting tolerances, ensuring consistent combustion chamber volume and optimal flame propagation. The pistons are engineered to withstand the rigors of increased cylinder pressures and temperatures common in performance builds.

The ring grooves are precision-cut to accommodate high-performance piston rings, enhancing sealing and reducing blow-by. The option for full-floating or press-fit wrist pins allows builders to customize assembly based on application requirements and durability preferences.

Installation & Fitment:

Designed as direct replacements for factory pistons in Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, these DSS Racing FX Series pistons require no major modifications for installation. Proper engine assembly practices, including ring end gap adjustment and piston-to-wall clearance measurement, are recommended to ensure optimal performance and longevity.

Compatibility with the 420 Small Block Mopar Hemi Gen III platform ensures a precise fit with existing components such as rods and cylinder heads. Builders should verify compression ratio targets based on selected combustion chamber volumes and engine setup.

What's Included:

• Set of forged +4cc dome top pistons (quantity as per SKU selection)
• Wrist pins (full-floating or press-fit depending on configuration)
• Installation instructions and technical specifications

Ideal For:

These pistons are perfect for performance enthusiasts, engine builders, and racers upgrading their 6.1L SRT8 engines for increased power and reliability. They suit naturally aspirated builds, mild forced induction setups, and high-performance street or track applications where enhanced compression and durability are desired.

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.