DSS Racing Forged +9cc Dome Top Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 5.7L Hemi Models

1-6718-3927 / 2-6718-3927 / 3-6718-3927 / K1-6718-3927 / K2-6718-3927 / K3-6718-3927

Overview:

The DSS Racing Forged +9cc Dome Top Piston Set is engineered specifically for the 5.7L Small Block Mopar Gen III Hemi engines found in many Chrysler, Dodge, Jeep, and Ram vehicles. Designed to enhance engine performance and durability, these pistons feature a +9cc dome top that increases compression ratios, delivering improved power output and throttle response. Ideal for enthusiasts and professional builders looking to upgrade their Hemi engine’s internals, this piston set offers a reliable solution for high-performance applications.

Whether you’re rebuilding your engine or seeking to boost its efficiency and strength, DSS Racing’s forged pistons provide the precision and quality needed to withstand demanding conditions while maintaining excellent fitment and compatibility with stock components.

Key Features:

These pistons incorporate advanced design and manufacturing techniques to ensure optimal performance and longevity. Key features include:

• +9cc dome top design for increased compression and power potential
• 3.927" bore diameter tailored for 5.7L Small Block Mopar Gen III Hemi engines
• Compatible with full-floating or press-fit wrist pins for versatile installation
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Forged construction for superior strength and durability under high stress
• Comp height of 1.21" optimized for factory and aftermarket cylinder heads
• Designed to work with a 3.578" stroke and 6.243" connecting rods
• Available in multiple compression volume options (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.47:1 to 12.12:1
• Precision machining ensures excellent balance and minimal friction

Construction & Design:

DSS Racing pistons are crafted from high-grade forged aluminum alloy, providing an ideal balance of lightweight strength and thermal conductivity. The forging process enhances the metal’s grain structure, resulting in pistons that resist cracking, scuffing, and deformation even under extreme combustion pressures and temperatures. The +9cc dome top shape is engineered to optimize combustion chamber dynamics, improving flame propagation and overall efficiency.

Each piston is CNC-machined to exacting tolerances, ensuring consistent dimensions and perfect fitment within the cylinder bore. The ring grooves are carefully cut to accommodate high-performance piston rings that maintain excellent sealing and reduce blow-by. The option for full-floating or press-fit wrist pins allows builders to customize the assembly based on their specific engine build requirements.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Gen III Hemi engine. Installation requires standard engine rebuilding procedures, including proper honing of the cylinder bore and careful assembly of piston rings and wrist pins. No major modifications are typically necessary, making these pistons a direct replacement or upgrade option for factory components.

Due to the increased dome volume, it is important to verify piston-to-valve clearance and overall compression ratio compatibility with your specific engine setup. Professional installation is recommended to ensure optimal performance and reliability.

What's Included:

• Set of forged +9cc dome top pistons (quantity as per engine requirements)
• Wrist pins (full-floating or press-fit, depending on selected option)
• Piston rings compatible 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 seeking to upgrade their 5.7L Hemi engines for increased power and durability. It suits applications ranging from street performance to moderate track use, where enhanced compression and reliable forged components are essential. Whether rebuilding a worn engine or building a high-output powerplant, DSS Racing pistons provide a solid foundation for improved engine performance.

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.