DSS Racing FX Series Forged Piston Set

Fits Chrysler, Dodge, Jeep, Ram 6.2L Hellcat, 6.4L 392 & Trackhawk Gen III Hemi

1-6811-4125 / 2-6811-4125 / 3-6811-4125 / K1-6811-4125 / K2-6811-4125 / K3-6811-4125

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for high-performance applications in Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat, 6.4L 392, and Trackhawk Gen III Hemi engines. Designed to handle the extreme demands of boosted and naturally aspirated builds, these pistons offer exceptional strength, durability, and precision fitment. Ideal for enthusiasts and professional builders seeking to maximize engine reliability and power output, this piston set delivers uncompromising quality and performance.

With a 4.125" bore size and a compact 1.12" compression height, these pistons are optimized for improved combustion efficiency and reduced reciprocating mass. The -7cc dish top design supports a variety of compression ratios, making them versatile for different tuning and fuel setups.

Key Features:

Built to exacting standards, the DSS Racing FX Series pistons incorporate advanced design elements to enhance engine performance and longevity:

• Forged from high-strength aluminum alloy for superior durability and heat resistance
• 4.125" bore diameter compatible with most Gen III Hemi 6.2L and 6.4L engines
• 7cc dish top for optimized combustion chamber volume and compression ratio tuning
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate high-performance piston rings
• Compact 1.12" compression height to maintain proper piston-to-deck clearance
• Designed for use with a 4.050" stroke crankshaft and 6.125" connecting rods
• Available in multiple dish volumes (65cc, 74cc, 85cc) to achieve compression ratios ranging from 9.8:1 to 11.98:1
• Precision CNC machining ensures tight tolerances and consistent performance

Construction & Design:

The DSS Racing FX Series pistons are forged from premium-grade aluminum alloy, providing an ideal balance of strength, weight, and thermal conductivity. This material choice allows the pistons to withstand the high cylinder pressures and temperatures typical of boosted and high-output naturally aspirated engines. The forged construction enhances fatigue resistance and reduces the risk of cracking under extreme conditions.

Each piston features a carefully engineered dish top design that reduces compression volume while maintaining optimal flame propagation characteristics. The pin bore is reinforced to accommodate either full-floating or press-fit wrist pins, offering flexibility depending on engine build preferences. The ring grooves are precision cut to accept high-performance ring sets, ensuring effective sealing and minimal blow-by.

Installation & Fitment:

This piston set is designed as a direct replacement for most Chrysler, Dodge, Jeep, and Ram Gen III Hemi 6.2L Hellcat, 6.4L 392, and Trackhawk engines with a 4.125" bore. Installation requires standard engine assembly procedures, including proper ring end gap setting and piston orientation. Depending on the wrist pin choice, either full-floating or press-fit installation methods can be employed. No major modifications to the block or rotating assembly are typically necessary, making these pistons a straightforward upgrade for performance builds.

What's Included:

• Set of forged pistons with -7cc dish top
• Precision-machined wrist pin bores (.927") compatible with full-floating or press-fit pins
• Ring grooves sized for 1.2mm top and second rings, 3mm oil ring
• Detailed specifications and installation guidelines

Ideal For:

The DSS Racing FX Series Forged Piston Set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding their Gen III Hemi 6.2L or 6.4L engines. Whether building a boosted Hellcat, a naturally aspirated 392, or a high-output Trackhawk, these pistons provide the strength and precision needed to support increased horsepower and torque while maintaining reliability 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.