DSS Racing Forged Piston Set

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

1-6827-4075 / 2-6827-4075 / 3-6827-4075 / K1-6827-4075 / K2-6827-4075 / K3-6827-4075

Overview:

The DSS Racing +4cc Dome Top Forged Piston Set is engineered specifically for the 6.1L Gen III Mopar Hemi engines found in Chrysler, Dodge, Jeep, and Ram SRT8 models. Designed to replace factory pistons, this set offers enhanced durability and performance for enthusiasts seeking to maximize their engine’s potential. The +4cc dome top design increases compression ratios, improving combustion efficiency and power output without compromising reliability.

Ideal for high-performance street and track applications, these pistons provide a solid foundation for engine builds that demand strength and precision. Whether upgrading a stock engine or assembling a custom build, DSS Racing pistons deliver consistent quality and fitment tailored to the 6.1L Hemi platform.

Key Features:

These forged pistons incorporate advanced design elements to ensure optimal performance and longevity:

• +4cc dome top for increased compression and improved combustion
• Compatible with 373 Small Block Mopar Hemi Gen III engines
• Pin diameter of .984" with options for full-floating or press-fit configurations
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring
• Comp height of 1.21 inches for precise piston-to-head clearance
• Stroke compatibility of 3.578 inches and connecting rod length of 6.243 inches
• Available in multiple compression ratios to suit different build requirements (approximate ratios: 65cc-12.74, 74cc-10.73, 85cc-9.54)
• Manufactured by DSS Racing, known for high-quality forged components

Construction & Design:

Crafted from premium forged aluminum alloy, these pistons are built to withstand the rigors of high-performance engines. The forging process enhances the metal’s grain structure, resulting in superior strength and resistance to thermal and mechanical stress compared to cast pistons. The dome top design not only increases compression but also optimizes combustion chamber shape for efficient flame propagation.

Each piston features precision-machined ring grooves and pin bores to ensure tight tolerances and reliable sealing under extreme conditions. The option for full-floating or press-fit wrist pins allows customization based on engine build preferences and durability needs.

Installation & Fitment:

Designed as a direct fit replacement for the 6.1L Gen III Mopar Hemi engines in Chrysler, Dodge, Jeep, and Ram SRT8 vehicles, these pistons require no major modifications for installation. Proper ring end gap and piston-to-wall clearance should be verified during assembly to ensure optimal performance and longevity. Professional installation is recommended to maintain engine integrity and achieve the best results.

What's Included:

• Set of forged +4cc dome top pistons (quantity as required for engine)
• Wrist pins (full-floating or press-fit options depending on SKU)
• Precision-machined piston rings compatible with specified groove dimensions
• Installation instructions and technical specifications

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and performance tuners working on 6.1L Gen III Mopar Hemi engines who seek to increase compression and durability. It suits street performance upgrades, track racing builds, and custom engine projects requiring reliable forged components engineered for high stress and power output.

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.