DSS Racing FX Series Forged Piston Set

Fits Chrysler / Dodge / Jeep / Ram 6.4L 392 Gen III Hemi Models

1-6845-4075C / 2-6845-4075C / 3-6845-4075C / K1-6845-4075C / K2-6845-4075C / K3-6845-4075C

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines. Designed to meet the demands of high-performance applications, these pistons offer exceptional strength and durability for enthusiasts and professional builders alike. Whether you are upgrading your engine for increased power or rebuilding for reliability, this piston set provides a precision fit and superior performance characteristics.

These forged pistons are crafted to optimize combustion efficiency and withstand the rigors of high-stress environments, making them ideal for street performance, racing, and heavy-duty use. The set is compatible with the 388 Small Block Mopar Hemi Gen III platform, ensuring seamless integration with your existing engine components.

Key Features:

The DSS Racing FX Series Forged Pistons incorporate advanced design and manufacturing techniques to deliver reliable performance and longevity. Key features include:

• Forged construction for enhanced strength and resistance to impact and heat
• 4.075" bore size tailored for 6.4L 392 Gen III Hemi engines
• Comp height of 1.21" for optimized piston-to-head clearance
• 18cc dish top design to control compression and improve combustion
• .927" wrist pin diameter with options for full-floating or press-fit pins
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for superior ring sealing
• Compatible with 3.720" stroke and 6.2" connecting rods
• Available with various combustion chamber volumes to adjust compression ratio (65cc, 74cc, 85cc)
• Precision machining for consistent fit and performance

Construction & Design:

Each piston in the DSS Racing FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight design and structural integrity. The forging process enhances the grain structure of the metal, resulting in pistons that resist cracking and deformation under extreme conditions. The -18cc dish top design helps manage compression ratios for improved detonation resistance and power delivery.

The pistons feature a .927" wrist pin bore that supports either full-floating or press-fit pins, allowing flexibility based on your engine build preferences. The ring grooves are precisely cut to accommodate 1.2mm top and second rings with a 3mm oil ring, ensuring optimal sealing and oil control for enhanced engine efficiency and longevity.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines, making it a direct replacement or upgrade option for these popular platforms. Installation requires standard engine rebuild procedures, including proper honing of the cylinder bores and careful assembly to manufacturer torque specifications. The pistons are compatible with a 3.720" stroke crankshaft and 6.2" connecting rods, ensuring a precise fit within the engine assembly.

Builders should verify clearance and compression ratio requirements based on their specific cylinder head and combustion chamber volumes. The availability of multiple combustion chamber volume options allows customization to match your performance goals and fuel requirements.

What's Included:

• Set of forged pistons with 4.075" bore diameter
• Wrist pins (full-floating or press-fit options depending on SKU)
• Ring grooves pre-cut for 1.2/1.2/3mm ring sets
• Detailed specifications for compression ratio and piston dimensions

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and racers seeking a durable, high-performance piston solution for the 6.4L 392 Gen III Hemi engine. Whether upgrading a street machine, building a track-ready race engine, or performing a reliable rebuild, the DSS Racing FX Series pistons provide the strength and precision needed to maximize engine potential.

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.