DSS Racing FX Series +4cc Dome Top Forged Pistons

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

1-6847-4065D / 2-6847-4065D / 3-6847-4065D / K1-6847-4065D / K2-6847-4065D / K3-6847-4065D

Overview:

The DSS Racing FX Series +4cc Dome Top Forged 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 combustion efficiency and increase compression ratios, delivering improved power and throttle response for enthusiasts seeking reliable upgrades for their high-performance Mopar engines.

Ideal for street performance, track use, or mild forced induction setups, these pistons offer a balance of durability and performance, making them a trusted choice for engine builders and racers alike. Their forged construction ensures they can withstand the rigors of high RPM and increased cylinder pressures.

Key Features:

Designed with advanced engineering and quality materials, the DSS Racing FX Series pistons provide several key benefits:

• +4cc dome top design to increase compression and optimize combustion chamber shape
• Compatible with 6.1L Gen III Mopar Hemi engines, fitting most Chrysler, Dodge, Jeep, and Ram SRT8 models
• Comp height of 1.21" for precise piston-to-head clearance and optimal quench
• Forged construction for superior strength and durability under high-stress conditions
• Ring groove dimensions of 1.2/1.2/3mm to accommodate high-performance piston rings
• Pin diameter of .927" with options for full-floating or press-fit installation
• Stroke compatibility of 3.578" and connecting rod length of 6.243" for exact fitment
• Available in multiple dome volumes (65cc, 74cc, 85cc) to tailor compression ratios from 9.49:1 up to 11.94:1

Construction & Design:

Each piston is forged from high-grade aluminum alloy, providing an excellent strength-to-weight ratio essential for high-performance applications. The dome top design not only increases compression but also improves flame propagation within the combustion chamber, enhancing power output and efficiency.

The pistons feature 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 requirements.

Installation & Fitment:

These pistons are engineered for direct fitment in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 Gen III Mopar Hemi engines without the need for extensive modifications. Proper installation requires standard engine rebuilding procedures, including honing the cylinder walls and selecting compatible piston rings and wrist pins.

Due to the variety of dome volumes available, builders can select the piston that best matches their desired compression ratio and engine setup. It is recommended to consult with a professional engine builder to ensure optimal fitment and performance.

What's Included:

• Set of four DSS Racing FX Series +4cc Dome Top Forged Pistons
• Choice of wrist pin configuration: full-floating or press-fit (depending on SKU)
• Technical specifications and installation guidelines

Ideal For:

These pistons are perfect for Mopar enthusiasts and professional engine builders looking to upgrade the 6.1L Gen III Hemi for enhanced performance. They suit naturally aspirated builds aiming for higher compression as well as mild forced induction applications requiring durable forged components. Whether for street performance, drag racing, or road course use, these pistons provide a reliable foundation for increased power and 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.