DSS Racing FX Series Forged Piston Set

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

1-6852-4125 / 2-6852-4125 / 3-6852-4125 / K1-6852-4125 / K2-6852-4125 / K3-6852-4125

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the 6.2L Gen III Hemi engines found in most Chrysler, Dodge, Jeep, and Ram Hellcat and Trackhawk models. Designed to handle high-performance demands, these pistons offer a reliable upgrade for enthusiasts seeking enhanced durability and efficiency. Whether you are rebuilding your engine or upgrading for increased power, this piston set delivers precision and strength to support aggressive driving and track use.

With a 4.125" bore size and a compact dish top design, these pistons optimize combustion chamber volume and compression ratios, making them ideal for performance builds that require both reliability and power. The FX Series pistons are a perfect fit for small block Mopar Hemi Gen III engines, providing a balance of lightweight construction and robust strength.

Key Features:

These forged pistons incorporate advanced engineering to meet the rigorous demands of high-output Hemi engines. Key features include:

• 4.125" bore diameter tailored for 6.2L Gen III Hemi applications
• Comp height of 1.275" for optimal piston-to-head clearance
• 10cc dish top design to control compression ratios and prevent detonation
• .945" wrist pin diameter with options for full-floating or press-fit installation
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for superior ring sealing
• Compatible with 3.578" stroke crankshafts and 6.2" connecting rods
• Available in multiple dish volumes to adjust compression ratio: 65cc (-10.37), 74cc (-9.46), and 85cc (-8.56)
• Precision CNC machining ensures consistent tolerances and fitment
• Forged from high-strength alloy for enhanced durability under extreme conditions

Construction & Design:

The DSS Racing FX Series pistons are forged from premium-grade aluminum alloy, providing an excellent strength-to-weight ratio essential for high-performance engines. The forging process refines the grain structure of the metal, resulting in pistons that resist cracking, scuffing, and thermal fatigue. The pistons feature a carefully engineered dish top to optimize combustion chamber shape and compression ratio, reducing the risk of detonation while maximizing power output.

Each piston is CNC-machined to exact specifications, ensuring perfect ring groove dimensions and wrist pin fitment. The option for full-floating or press-fit wrist pins allows for customization based on engine build preferences. The ring grooves are designed to accommodate high-performance piston rings, maintaining excellent sealing under high cylinder pressures.

Installation & Fitment:

This piston set is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk Gen III Hemi engines. Installation requires standard engine rebuild procedures, including proper honing of cylinder walls and precise ring end gap adjustments. The pistons are compatible with 3.578" stroke crankshafts and 6.2" connecting rods commonly used in these engines.

Depending on the chosen dish volume, the compression ratio can be tailored to suit naturally aspirated or forced induction setups. Professional installation is recommended to ensure optimal engine performance and longevity.

What's Included:

• Set of forged pistons with 4.125" bore diameter
• Wrist pins (.945") with options for full-floating or press-fit configuration
• Precision-machined piston rings grooves (1.2/1.2/3mm)
• Installation instructions and specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding their 6.2L Gen III Hemi engines. It suits applications ranging from street performance to track and drag racing, especially where increased durability and compression tuning are required. The FX Series pistons provide a reliable foundation for high-horsepower builds and forced induction setups.

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.