DSS Racing FX Series Forged Piston Set

Fits Chrysler, Dodge, Jeep, Ram 6.2L Hellcat & 6.4L 392 Models

1-6816-4090 / 2-6816-4090 / 3-6816-4090 / K1-6816-4090 / K2-6816-4090 / K3-6816-4090

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 and 6.4L 392 engines. Designed to handle the extreme demands of boosted and naturally aspirated setups, these pistons offer exceptional strength and durability for enthusiasts and professional builders alike. Whether upgrading for street performance, track use, or serious racing, this piston set delivers reliable power and efficiency improvements.

Built to exacting standards, the FX Series pistons feature a forged construction that ensures superior resistance to heat and stress compared to stock cast pistons. Their precise dimensions and design optimize combustion efficiency and compression ratios, contributing to enhanced engine response and longevity.

Key Features:

These pistons incorporate advanced engineering to meet the rigorous requirements of Mopar’s 426 Small Block Hemi Gen III engines. Key features include:

• Forged construction for maximum strength and durability under high stress
• 4.090" bore size, compatible with most Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and 6.4L 392 engines
• Comp height of 1.12" for optimal piston-to-head clearance and performance
• 23cc dish top design to control compression and support various combustion chamber volumes
• .927" wrist pin diameter with options for full-floating or press-fit installation
• Ring groove dimensions of 1.2/1.2/3mm for reliable sealing and reduced friction
• Stroke compatibility of 4.050" and connecting rod length of 6.125" for balanced engine geometry
• Available in multiple dish volumes (65cc, 74cc, 85cc) to achieve approximate compression ratios ranging from 8.48 to 10.03
• Precision machining for consistent fit and finish, ensuring smooth engine operation

Construction & Design:

The DSS Racing FX Series pistons are crafted from high-grade forged aluminum alloy, providing an excellent strength-to-weight ratio essential for high-performance engines. The forging process enhances the metal’s grain structure, resulting in pistons that resist cracking, deformation, and thermal fatigue even under extreme combustion pressures.

The piston crown features a carefully engineered dish design that helps manage compression ratios and combustion dynamics, optimizing power output and engine efficiency. The wrist pin bore is reinforced to accommodate either full-floating or press-fit pins, allowing builders flexibility based on their specific engine build preferences.

Ring grooves are precision-cut to maintain optimal ring seal and reduce blow-by, contributing to improved oil control and longevity. The overall design balances durability with lightweight construction to reduce reciprocating mass and improve throttle response.

Installation & Fitment:

This piston set is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat and 6.4L 392 engines, including popular models such as the Dodge Challenger, Charger, Jeep Grand Cherokee Trackhawk, and Ram 1500 TRX. Installation requires standard engine rebuild procedures and may involve professional machining to ensure proper clearances and ring end gaps.

Builders should verify compatibility with their specific engine configuration, including stroke and rod length, to ensure optimal performance and reliability. The pistons support both full-floating and press-fit wrist pin options, providing versatility for different assembly preferences.

What's Included:

• Set of forged pistons sized for 4.090" bore
• Wrist pin options (full-floating or press-fit)
• Precision-cut ring grooves ready for piston rings (rings sold separately)
• Technical specifications and installation guidelines

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers seeking to upgrade or rebuild their Mopar 6.2L Hellcat or 6.4L 392 engines. It suits applications ranging from street performance and drag racing to road course and off-road use, providing a reliable foundation for increased power and durability.

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.