DSS Racing FX Series Forged Pistons

Fits Most Chrysler / Dodge / Jeep / Ram 6.2L Hellcat & 6.4L Models

1-6811-4090 / 2-6811-4090 / 3-6811-4090 / K1-6811-4090 / K2-6811-4090 / K3-6811-4090

Overview:

The DSS Racing FX Series Forged Pistons are precision-engineered performance components designed to fit most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat and 6.4L engines. Crafted for enthusiasts and professional builders alike, these pistons offer a reliable upgrade for high-performance small block Mopar Hemi Gen III applications. With a 4.090" bore size and a compact design, they provide enhanced strength and durability to withstand the rigors of boosted and naturally aspirated setups.

These pistons are ideal for those seeking to improve engine reliability and power potential while maintaining factory-like dimensions and compatibility. Whether building a street machine, track car, or drag racer, the DSS Racing FX Series pistons deliver consistent performance and long-term durability.

Key Features:

Engineered for high-performance Mopar applications, these pistons incorporate advanced design elements to optimize strength, weight, and combustion efficiency.

• Forged from premium billet aluminum for superior strength and heat resistance
• 4.090" bore diameter compatible with most 6.2L Hellcat and 6.4L 392 engines
• Comp height of 1.12" for precise deck clearance and optimal compression
• 7cc dish top design to control compression ratio and reduce detonation risk
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable ring sealing and reduced friction
• Stroke compatibility of 4.050" and connecting rod length of 6.125" for balanced piston speed and strength
• Available in multiple dish volumes (65cc, 74cc, 85cc) to tailor compression ratios from 9.67 to 11.82
• Designed to fit the 426 Small Block Mopar Hemi Gen III platform with exacting tolerances

Construction & Design:

The DSS Racing FX Series pistons are forged using high-grade aluminum alloys selected for their excellent strength-to-weight ratio and thermal conductivity. The forging process enhances the grain structure, resulting in pistons that resist cracking and deformation under extreme combustion pressures and temperatures. Each piston features a precision-machined dish top to optimize combustion chamber shape and compression ratio, improving power delivery and engine efficiency.

Pin bosses are engineered to accept either full-floating or press-fit wrist pins, providing flexibility for different engine builds and performance requirements. The ring grooves are carefully cut to accommodate performance ring sets, ensuring effective sealing and reduced blow-by. Overall, the design balances durability with lightweight construction to maximize engine responsiveness and longevity.

Installation & Fitment:

These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and 6.4L 392 engines, making installation straightforward for experienced engine builders. Minimal modifications are required when used with compatible rods and blocks. Proper ring end gap and piston-to-wall clearance should be checked during assembly to ensure optimal performance and reliability.

Whether assembling a fresh build or upgrading an existing engine, these pistons fit seamlessly into the Gen III small block Mopar Hemi platform, supporting a variety of compression ratios and power levels.

What's Included:

• Set of 8 DSS Racing FX Series forged pistons (4.090" bore)
• Wrist pin compatibility for full-floating or press-fit installation
• Detailed specifications for dish volume and compression ratio options

Ideal For:

• Performance enthusiasts upgrading Hellcat and 392 Hemi engines
• Engine builders seeking durable forged pistons for boosted or naturally aspirated setups
• Street, track, and drag racing applications requiring reliable high-performance components
• Rebuilds and custom engine projects on Chrysler, Dodge, Jeep, and Ram platforms

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.