DSS Racing FX Series Forged Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 6.4L 392 Models

1-6833-4100 / 2-6833-4100 / 3-6833-4100 / K1-6833-4100 / K2-6833-4100 / K3-6833-4100

Overview:

The DSS Racing FX Series Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines. Designed to replace factory pistons with a high-performance upgrade, these forged pistons provide enhanced strength, durability, and reliability under extreme conditions. Ideal for enthusiasts and professional builders looking to maximize engine output and longevity, this piston set supports both street and track applications.

Built to exacting standards, these pistons are compatible with the 393 Small Block Mopar HEMI Gen III platform and feature a 4.100" bore size. They are designed to maintain optimal compression ratios while accommodating various combustion chamber volumes, making them versatile for different build goals.

Key Features:

The DSS Racing FX Series pistons incorporate advanced design elements and precision manufacturing to deliver superior performance and reliability:

• Forged construction for maximum strength and resistance to high-stress conditions
• 4.100" bore size tailored for most 6.4L 392 HEMI engines
• Comp height of 1.21" for optimal piston-to-deck clearance
• 12cc dish top design to control compression and support various combustion chamber sizes
• .945" wrist pin diameter with options for full-floating or press-fit configurations
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring for effective sealing and oil control
• Compatible with 3.720" stroke and 6.2" connecting rods, matching factory and aftermarket setups
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to achieve compression ratios from 8.62:1 up to 10.39:1
• Precision balanced and machined for consistent performance and longevity

Construction & Design:

Crafted from high-grade forged aluminum alloy, the DSS Racing FX Series pistons offer superior strength-to-weight ratio compared to cast pistons. The forging process enhances grain structure, providing increased resistance to thermal and mechanical stress. The pistons feature a carefully engineered dish top design with a -12cc volume to optimize combustion efficiency and reduce detonation risk.

The wrist pin bore is designed to accommodate either full-floating or press-fit pins, allowing flexibility depending on engine build preferences. Ring grooves are precision-machined to ensure proper ring seating and sealing, contributing to improved oil control and reduced blow-by. The pistons are designed to work seamlessly with the 6.4L 392 HEMI’s 3.720" stroke crankshaft and 6.2" rods, maintaining factory geometry and clearances.

Installation & Fitment:

This piston set is engineered as a direct fit replacement for most Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines. Installation requires standard engine assembly procedures, including proper ring end gap setting, wrist pin installation, and piston orientation. Depending on the wrist pin option selected (full-floating or press-fit), minor adjustments to assembly technique may be necessary.

These pistons are compatible with factory and aftermarket components designed for the 393 Small Block Mopar HEMI Gen III platform, making them suitable for rebuilds, performance upgrades, and custom engine builds without extensive modifications.

What's Included:

• Set of 8 DSS Racing FX Series forged pistons (4.100" bore)
• Wrist pins (.945") with options for full-floating or press-fit installation
• Precision-machined piston rings (1.2mm top and second rings, 3mm oil rings)
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers who demand reliable, high-strength components for their 6.4L 392 HEMI-powered Chrysler, Dodge, Jeep, or Ram vehicles. Whether upgrading a street engine for increased power and durability or building a race-ready powerplant, these forged pistons provide the foundation for enhanced performance and engine longevity.

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.