DSS Racing FX Series Forged Pistons

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

1-6845-4065C / 2-6845-4065C / 3-6845-4065C / K1-6845-4065C / K2-6845-4065C / K3-6845-4065C

Overview:

The DSS Racing FX Series Forged Pistons are precision-engineered components designed specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.4L 392 Gen III Hemi engine. Crafted to meet the demanding needs of high-performance and racing applications, these pistons offer exceptional strength, durability, and reliability. Whether you are building a powerful street machine or a competitive race engine, these forged pistons provide the foundation for increased horsepower and torque while maintaining engine integrity under extreme conditions.

With a bore size of 4.065 inches and a compact design featuring a -18cc dish top, these pistons optimize combustion efficiency and compression ratios. The FX Series pistons are ideal for enthusiasts and professional builders seeking to upgrade their 6.4L Hemi engines with components that deliver consistent performance and longevity.

Key Features:

Engineered for high-performance applications, the DSS Racing FX Series Forged Pistons include the following key features:

• Forged from premium-grade aluminum alloy for superior strength and heat resistance
• Compatible with Chrysler / Dodge / Jeep / Ram 6.4L 392 Gen III Hemi engines
• 4.065" bore size tailored for 386 Small Block Mopar Hemi Gen III configurations
• Compact 1.21" compression height for optimal piston-to-deck clearance
• 18cc dish top design to control compression ratio and improve detonation resistance
• .927" wrist pin diameter available in full-floating or press-fit options
• Precision-machined ring grooves sized at 1.2mm / 1.2mm / 3mm for reliable ring sealing
• Designed for use with a 3.720" stroke crankshaft and 6.2" connecting rods
• Approximate compression ratios vary based on combustion chamber volume: 65cc-9.65, 74cc-8.87, 85cc-8.1

Construction & Design:

The DSS Racing FX Series pistons are forged from high-quality aluminum alloy, providing an excellent balance of lightweight construction and exceptional strength. The forging process enhances the metal’s grain structure, resulting in pistons that withstand the rigors of high cylinder pressures and elevated temperatures common in performance engines.

Each piston features a carefully engineered dish top with an 18cc volume reduction to optimize combustion chamber dynamics and reduce the risk of detonation. The pistons are designed with precise ring grooves to accommodate performance ring sets, ensuring effective sealing and reduced blow-by. The wrist pin bore supports either full-floating or press-fit pins, allowing builders to customize assembly based on application requirements.

Installation & Fitment:

These pistons are direct fit replacements for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.4L 392 Gen III Hemi engine. Installation requires standard engine assembly procedures and may involve balancing and blueprinting for optimal performance. The pistons are compatible with a 3.720" stroke crankshaft and 6.2" connecting rods, making them suitable for engine builds that maintain factory stroke dimensions.

Builders should verify piston-to-valve clearance and ring end gaps during installation. The availability of full-floating or press-fit wrist pin options allows for flexibility depending on engine build preferences and intended use.

What's Included:

• Set of forged pistons sized for 4.065" bore
• Wrist pin options: full-floating or press-fit (depending on SKU)
• Precision-machined ring grooves ready for performance ring sets
• Detailed specifications for compression height, dish volume, and pin diameter

Ideal For:

The DSS Racing FX Series Forged Pistons are ideal for automotive enthusiasts, engine builders, and racers who demand reliable, high-strength components for their 6.4L 392 Gen III Hemi engines. They are perfectly suited for street performance upgrades, drag racing, road racing, and other motorsport applications where durability and power gains are critical.

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.