DSS Racing FX Series Forged Piston Set

Chrysler / Dodge / Jeep / Ram 6.4L 392 / 6.2L Hellcat & Trackhawk

1-6815-4125 / 2-6815-4125 / 3-6815-4125 / K1-6815-4125 / K2-6815-4125 / K3-6815-4125

Overview:

The DSS Racing FX Series Forged Piston Set is engineered for high-performance applications in Mopar Gen III Hemi engines, specifically designed to fit 6.2L Hellcat, 6.4L 392, and Trackhawk models. These pistons are crafted to withstand the extreme demands of boosted and naturally aspirated setups, offering enhanced strength and durability over stock components. Ideal for enthusiasts and professional builders aiming to maximize engine reliability and power output, this piston set ensures consistent performance under high stress.

With a bore size of 4.125 inches and a compression height of 1.12 inches, these pistons provide a precise fit for the 433 Small Block Mopar Hemi Gen III platform. The design incorporates a -18cc dish top to optimize combustion chamber volume and compression ratios, supporting a range of build configurations.

Key Features:

Designed with performance and reliability in mind, the DSS Racing FX Series pistons offer the following key features:

• Forged construction for superior strength and resistance to detonation
• 1.2mm/1.2mm/3mm ring grooves compatible with full-floating or press-fit pins
• Pin diameter of .927 inches for enhanced wrist pin stability
• Stroke compatibility of 4.050 inches and connecting rod length of 6.125 inches
• Available in multiple dish volumes (-18cc) to achieve approximate compression ratios of 10.67:1, 9.8:1, and 8.94:1 depending on combustion chamber size
• Precision-machined for optimal piston-to-wall clearance and ring seal
• Compatible with Mopar Gen III Hemi 6.2L Hellcat, 6.4L 392, and Trackhawk engines
• Designed to handle high horsepower and torque applications including forced induction

Construction & Design:

The FX Series pistons are forged from high-grade aluminum alloy, providing an excellent balance of lightweight design and structural integrity. The forging process enhances grain structure, resulting in pistons that resist cracking and deformation under high thermal and mechanical loads. The dish top design reduces compression volume by 18cc, allowing for fine-tuning of compression ratios to suit various engine builds and fuel types.

Each piston features precision-machined ring grooves sized at 1.2mm for the top and second rings, and 3mm for the oil ring, ensuring optimal ring seating and oil control. The wrist pin bore supports either full-floating or press-fit pins, offering flexibility depending on engine assembly preferences. The pistons are engineered to maintain tight tolerances for bore and stroke compatibility, ensuring reliable operation in high-performance Mopar Gen III Hemi engines.

Installation & Fitment:

This piston set is designed for direct fitment in Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.4L 392 Hemi, 6.2L Hellcat, and Trackhawk engines. Installation requires standard engine assembly procedures, including proper ring end gap setting and piston orientation. Due to the forged construction and precise dimensions, these pistons are suitable for both rebuilds and performance upgrades without the need for extensive modifications.

Builders should verify compatibility with their specific engine build, including bore size and compression chamber volume, to ensure optimal performance and reliability.

What's Included:

• Set of forged aluminum pistons with 4.125" bore diameter
• Precision-machined piston rings (1.2/1.2/3mm groove sizes)
• Wrist pin bore compatible with full-floating or press-fit pins
• Technical specifications and installation guidelines

Ideal For:

The DSS Racing FX Series Forged Piston Set is ideal for performance enthusiasts, professional engine builders, and racers who demand durability and precision from their Mopar Gen III Hemi engines. Whether upgrading a Hellcat, 392, or Trackhawk for street, strip, or off-road use, these pistons provide the strength and design features necessary to support high horsepower and torque levels while maintaining engine reliability.

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.