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

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

1-6837-4100 / 2-6837-4100 / 3-6837-4100 / K1-6837-4100 / K2-6837-4100 / K3-6837-4100

Overview:

The DSS Racing FX Series +4cc Dome Top Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines, providing a reliable and performance-oriented upgrade for enthusiasts and professional builders alike. Designed to fit most 6.4L 392 models, these pistons offer a precise 4.100" bore size and a +4cc dome top design to optimize combustion chamber volume and compression ratios.

Ideal for high-performance applications, these pistons are crafted to enhance engine durability and efficiency while supporting increased power output. Whether you are rebuilding or upgrading your 6.4L HEMI, the DSS Racing FX Series pistons deliver consistent quality and performance for street, strip, or track use.

Key Features:

These forged pistons incorporate advanced design elements and materials to meet the demands of modern high-performance engines:

• +4cc dome top design to increase compression and improve combustion efficiency
• Compatible with 4.100" bore size, fitting most Chrysler / Dodge / Jeep / Ram 6.4L 392 engines
• Forged construction for superior strength and durability under high stress
• Pin diameter of .945" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm top and second rings, and 3mm oil ring groove for optimal sealing
• Designed for a 3.720" stroke and 6.2" connecting rods, matching factory and performance builds
• Available in multiple compression volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.98 to 12.56
• Comp height of 1.21" to maintain proper deck clearance and piston-to-valve clearance

Construction & Design:

Each piston in the DSS Racing FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight strength and thermal conductivity. The dome top design is precision-machined to ensure consistent combustion chamber volume and optimal compression ratios tailored to your engine build.

The pistons feature carefully engineered ring grooves to accommodate high-performance piston rings, enhancing sealing and reducing blow-by. The wrist pin bore supports either full-floating or press-fit pins, allowing flexibility depending on your engine assembly preferences. This attention to detail ensures durability and reliability even under demanding operating conditions.

Installation & Fitment:

These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.4L 392 HEMI engines, making installation straightforward for experienced engine builders. Proper machining of the cylinder bore to 4.100" is required to ensure a precise fit. Depending on your build, selecting the appropriate wrist pin retention method (full-floating or press-fit) is essential for optimal performance and longevity.

Due to the +4cc dome volume, these pistons may alter compression ratios, so verify compatibility with your cylinder head and combustion chamber specifications to achieve desired engine performance.

What's Included:

• Set of forged aluminum pistons (quantity as per SKU selection)
• Wrist pin(s) compatible with full-floating or press-fit installation
• Detailed specifications for bore size, ring groove dimensions, and compression volumes

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler / Dodge / Jeep / Ram 6.4L 392 HEMI engines. It suits applications ranging from street performance to competitive motorsports where increased compression and durability are critical. The multiple compression volume options allow customization to match forced induction or naturally aspirated setups.

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.