DSS Racing FX Series +4cc Dome Top Forged Piston Set

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

1-6847-4075C / 2-6847-4075C / 3-6847-4075C / K1-6847-4075C / K2-6847-4075C / K3-6847-4075C

Overview:

The DSS Racing FX Series +4cc Dome Top Forged Piston Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines. Designed to enhance performance and reliability, these pistons are ideal for enthusiasts and builders seeking to maximize power output while maintaining durability under high-stress conditions. Featuring a +4cc dome top design, these pistons increase compression ratios and optimize combustion efficiency for improved engine response.

Whether you are building a high-performance street machine or a race-ready engine, DSS Racing’s forged pistons provide the strength and precision needed to handle increased boost, higher RPMs, and aggressive tuning strategies.

Key Features:

These pistons incorporate advanced engineering and materials to deliver superior performance and longevity. Key features include:

• +4cc dome top design to increase compression and power potential
• Forged construction for exceptional strength and durability
• Comp height of 1.21" for optimal piston-to-head clearance
• Pin diameter of .927" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable sealing and reduced friction
• Designed for 3.720" stroke and 6.2" connecting rods
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios from 9.88:1 to 12.44:1
• Precision CNC machining ensures tight tolerances and consistent performance

Construction & Design:

DSS Racing FX Series pistons are crafted from high-quality forged aluminum alloy, providing an excellent strength-to-weight ratio essential for high-performance applications. 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 dome top design not only increases compression but also promotes efficient combustion chamber dynamics, improving throttle response and power delivery. The pistons feature carefully engineered ring grooves and pin bosses to maintain ring seal integrity and reduce wear, contributing to longer engine life and consistent performance.

Installation & Fitment:

These pistons are designed as direct replacements for Chrysler, Dodge, Jeep, and Ram 6.4L 392 Gen III Hemi engines, ensuring straightforward installation with minimal modifications. Compatibility with both full-floating and press-fit wrist pins allows flexibility depending on your engine build preferences. Proper ring end gap and piston-to-wall clearance should be verified during installation to achieve optimal performance and reliability.

What's Included:

• Set of forged +4cc dome top pistons (quantity as per engine requirements)
• Wrist pins compatible with full-floating or press-fit setups
• Detailed specifications for ring groove dimensions and piston geometry

Ideal For:

This piston set is ideal for performance engine builders, professional tuners, and enthusiasts upgrading their 6.4L 392 Gen III Hemi engines. It suits applications ranging from street performance and drag racing to road course and off-road builds where increased compression and durability are critical. The multiple combustion chamber volume options allow customization of compression ratios to match fuel types and tuning goals.

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.