DSS Racing Forged +4cc Dome Top Pistons

2005–2010 Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Gen III Mopar Hemi

1-6847-4085D / 2-6847-4085D / 3-6847-4085D / K1-6847-4085D / K2-6847-4085D / K3-6847-4085D

Overview:

The DSS Racing Forged +4cc Dome Top Pistons are precision-engineered performance components designed specifically for the 6.1L Gen III Mopar Hemi engines found in most Chrysler, Dodge, Jeep, and Ram SRT8 models. These pistons are crafted to enhance engine durability and efficiency while supporting higher compression ratios for improved power output. Ideal for enthusiasts and professional builders seeking reliable, high-quality pistons that withstand the rigors of high-performance applications.

Featuring a +4cc dome top design, these pistons increase the combustion chamber volume, allowing for optimized compression ratios that can be tailored to your build. Whether upgrading for street performance or track use, these pistons provide a solid foundation for maximizing the potential of your 6.1L Hemi engine.

Key Features:

Engineered for durability and performance, these DSS Racing pistons offer several advanced features:

• Forged construction for superior strength and resistance to high stress
• +4cc dome top design to increase compression and improve combustion efficiency
• Pin diameter of .927" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm for optimal sealing and reduced friction
• Comp height of 1.21" designed for compatibility with 3.578" stroke crankshafts
• Rod length compatibility at 6.243" for precise engine geometry
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to achieve compression ratios ranging from 9.57:1 to 12.03:1
• Designed specifically for the 375 Small Block Mopar Hemi Gen III platform

Construction & Design:

These pistons are manufactured using high-grade forged aluminum alloy, providing an excellent balance of lightweight design and exceptional strength. The forging process enhances grain structure, resulting in pistons that resist cracking and deformation under extreme heat and pressure conditions typical of high-performance engines.

The dome top shape is precisely machined to optimize combustion chamber dynamics, improving flame propagation and power delivery. The pistons feature carefully engineered ring grooves to maintain effective sealing while minimizing friction and wear. Additionally, the pin bore is designed to accommodate either full-floating or press-fit wrist pins, offering flexibility for different engine builds.

Installation & Fitment:

These DSS Racing pistons are direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 Gen III Mopar Hemi engines. Installation requires standard engine assembly procedures and may necessitate professional machining to ensure proper clearances and fitment depending on your specific build. The pistons are compatible with the factory 3.578" stroke crankshaft and 6.243" connecting rods, simplifying the upgrade process.

Proper ring installation and torque specifications should be followed to maximize longevity and performance. These pistons are ideal for engine rebuilds, performance upgrades, or custom builds where enhanced compression and durability are desired.

What's Included:

• Set of forged +4cc dome top pistons (quantity as per SKU selection)
• Precision-machined ring grooves
• Pin bore compatible with full-floating or press-fit wrist pins
• Technical specifications and installation guidelines

Ideal For:

These DSS Racing pistons are perfect for automotive enthusiasts, professional engine builders, and racers who demand reliable, high-performance components for their 6.1L Mopar Hemi engines. Whether you are upgrading a street vehicle for enhanced power or building a race engine that requires robust internals, these pistons provide the strength and design features necessary to support aggressive tuning and increased compression ratios.

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.