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

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

1-6847-4100C / 2-6847-4100C / 3-6847-4100C / K1-6847-4100C / K2-6847-4100C / K3-6847-4100C

Overview:

The DSS Racing FX Series +4cc Dome Top Forged 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 durability and improved combustion efficiency, making it an ideal upgrade for enthusiasts seeking to boost engine power and reliability.

These pistons are crafted to accommodate the 393 Small Block Mopar HEMI Gen III platform, featuring a +4cc dome top design that optimizes compression ratios for increased performance. Whether you are building a street performance engine or a race-ready powerplant, these pistons provide the strength and precision required for demanding conditions.

Key Features:

Built with advanced engineering and precision manufacturing, the DSS Racing FX Series pistons deliver superior performance and reliability. Key features include:

• Forged construction for maximum strength and durability under high stress
• +4cc dome top design to increase compression and improve combustion efficiency
• Compatible with 4.100" bore size, fitting most 6.4L 392 HEMI engines
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm for optimal ring sealing
• Designed for a 3.720" stroke and 6.2" connecting rods, matching factory specifications
• Available in multiple compression ratio options: 65cc dome (12.56:1), 74cc dome (11.23:1), and 85cc dome (9.98:1)
• Precision machined for consistent fitment and performance

Construction & Design:

The DSS Racing FX Series pistons are forged from high-grade aluminum alloy, providing an excellent balance of lightweight construction and exceptional strength. The forging process enhances grain structure, resulting in pistons that resist cracking and deformation under extreme heat and pressure.

The dome top design increases the combustion chamber volume, allowing for higher compression ratios that translate into improved power output and throttle response. Each piston is meticulously machined to tight tolerances, ensuring optimal ring sealing and minimal friction for enhanced engine efficiency.

Installation & Fitment:

This piston set is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines, making installation straightforward for experienced engine builders and professional shops. Depending on your engine build, you may choose between full-floating or press-fit wrist pins to suit your performance needs.

Proper ring end gap and clearance checks are recommended during installation to ensure optimal performance and longevity. These pistons are compatible with standard 3.720" stroke crankshafts and 6.2" connecting rods, matching factory dimensions for seamless integration.

What's Included:

• Set of forged +4cc dome top pistons (quantity as per engine requirements)
• Wrist pins (.927" diameter) with options for full-floating or press-fit installation
• Precision-machined piston rings with 1.2/1.2/3mm groove dimensions
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers who demand increased power and durability from their 6.4L 392 HEMI engines. Whether upgrading a street machine, building a drag racing engine, or enhancing off-road performance, these pistons provide a reliable foundation for high-output builds.

They are especially suited for applications requiring higher compression ratios and improved combustion efficiency without compromising 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.