DSS Racing Gen III FX Series Forged Flat Top Piston Set

Fits Chrysler, Dodge, Jeep, Ram 6.4L 392 Models

1-6830-4100 / 2-6830-4100 / 3-6830-4100 / K1-6830-4100 / K2-6830-4100 / K3-6830-4100

Overview:

The DSS Racing Gen III FX Series Forged Flat Top Piston Set is engineered specifically for high-performance applications in Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.4L 392 HEMI engine. Designed to replace factory pistons, this set offers enhanced strength and durability to withstand the rigors of increased horsepower and aggressive driving conditions. Ideal for enthusiasts and professional builders looking to maximize engine reliability and efficiency, these pistons deliver consistent performance and improved combustion characteristics.

Built to exacting standards, these pistons feature a flat top design with a -1.5cc dish, optimizing compression ratios for a variety of combustion chamber sizes. Whether upgrading for street performance, track use, or off-road applications, this piston set provides a solid foundation for engine builds requiring precision and toughness.

Key Features:

Designed with advanced engineering and premium materials, the DSS Racing Gen III FX Series pistons offer the following key features:

• Compatible with 6.4L 392 Small Block Mopar HEMI Gen III engines
• Flat top piston design with a -1.5cc dish for optimized combustion
• Comp height of 1.21 inches for precise deck clearance
• .945-inch wrist pin diameter, available in full-floating or press-fit configurations
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring
• Stroke compatibility of 3.720 inches and connecting rod length of 6.2 inches
• Approximate compression ratios vary by combustion chamber size: 11.63:1 (65cc), 10.5:1 (74cc), 9.41:1 (85cc)
• Forged construction for superior strength and durability under high stress
• Precision machining ensures tight tolerances and consistent performance

Construction & Design:

Each piston in the DSS Racing Gen III FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight design and exceptional strength. The forging process enhances the metal’s grain structure, resulting in pistons that resist cracking, scuffing, and thermal fatigue even under extreme operating conditions. The flat top design with a slight dish improves combustion efficiency and helps control detonation, making these pistons suitable for a wide range of compression ratios and fuel types.

Attention to detail in the ring grooves and wrist pin bore ensures optimal ring seal and wrist pin stability, reducing friction and wear. The option for full-floating or press-fit wrist pins allows builders to tailor the pistons to their specific engine setup and performance goals.

Installation & Fitment:

This piston set is designed as a direct fit replacement for most Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines, making installation straightforward for experienced engine builders and professional shops. Minimal modifications are required when used with compatible components, and the pistons maintain factory deck height specifications for ease of assembly. Proper ring installation and clearance checks are recommended to ensure optimal performance and longevity.

What's Included:

• Set of forged flat top pistons (quantity as required for engine configuration)
• Wrist pins (full-floating or press-fit depending on selected option)
• Ring sets matching the specified groove dimensions
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram 6.4L 392 HEMI engines. It suits applications ranging from street performance and muscle car builds to off-road and track racing, where enhanced durability and precise combustion control are critical. Whether increasing boost, adding nitrous, or simply seeking a stronger bottom end, these pistons provide a reliable foundation for high-output engine builds.

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.