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

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

1-6827-4085 / 2-6827-4085 / 3-6827-4085 / K1-6827-4085 / K2-6827-4085 / K3-6827-4085

Overview:

The DSS Racing FX Series Forged +4cc Dome Top Piston Set is engineered specifically for the 6.1L SRT8 engines found in Chrysler, Dodge, Jeep, and Ram vehicles. Designed to enhance performance and durability, these pistons are an ideal upgrade for enthusiasts seeking improved combustion efficiency and reliability under high-stress conditions. Featuring a +4cc dome top design, they increase compression ratios, helping to unlock additional power potential while maintaining engine longevity.

These pistons are perfect for builders and tuners who demand precision and strength in their engine components. Whether you are rebuilding or upgrading your 6.1L SRT8, the DSS Racing FX Series pistons provide a solid foundation for high-performance applications.

Key Features:

Crafted with advanced engineering and attention to detail, the FX Series pistons offer several key benefits:

• Forged construction for superior strength and durability
• +4cc dome top design to increase compression ratio and power output
• Compatible with 4.085" bore size, fitting most 6.1L SRT8 engines
• Pin diameter of .984" with options for full-floating or press-fit installation
• Ring groove dimensions of 1.2/1.2/3mm for optimal sealing and reduced friction
• Designed for a 3.578" stroke and 6.243" connecting rod length
• Available in multiple compression volumes: 65cc (approx. 12.03:1), 74cc (approx. 10.77:1), and 85cc (approx. 9.57:1)
• Precision machined to ensure consistent performance and fitment

Construction & Design:

The DSS Racing FX Series 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 resist cracking and deformation under extreme heat and pressure. The +4cc dome top shape is carefully engineered to optimize combustion chamber dynamics, improving power delivery and throttle response.

Each piston features precisely cut ring grooves to accommodate standard 1.2mm top and second rings with a 3mm oil ring, ensuring effective sealing and oil control. The pin bore is designed for flexibility, allowing either full-floating or press-fit wrist pin installation depending on your build preferences. This versatility makes the FX Series pistons suitable for a wide range of performance setups.

Installation & Fitment:

These pistons are designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines with a 4.085" bore. Installation requires standard engine rebuilding procedures and may involve honing the cylinder bore to the correct size. The choice between full-floating or press-fit wrist pins allows customization based on your engine’s intended use and assembly preferences. Proper ring end gap and piston clearance measurements should be verified during installation to ensure optimal performance and longevity.

What's Included:

• Set of forged +4cc dome top pistons (quantity as per kit selection)
• Wrist pin options for full-floating or press-fit installation
• Precision-machined ring grooves ready for standard piston rings

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding 6.1L SRT8 engines. It suits applications ranging from street performance to track use where increased compression and durability are required. The FX Series pistons provide a reliable foundation for enhancing power output while maintaining engine integrity under demanding conditions.

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.