DSS Racing FX Series +9cc Dome Top Forged Piston Set

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

1-6728-3927 / 2-6728-3927 / 3-6728-3927 / K1-6728-3927 / K2-6728-3927 / K3-6728-3927

Overview:

The DSS Racing FX Series +9cc Dome Top Forged Piston Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Hemi engine. Designed to enhance engine performance and durability, these pistons are an ideal upgrade for enthusiasts seeking improved compression and combustion efficiency. Whether you're rebuilding your engine or upgrading for higher power output, this piston set offers a reliable foundation for performance builds.

Featuring a +9cc dome top design, these pistons increase the compression ratio, helping to optimize power delivery and throttle response. They are compatible with the 347 Small Block Mopar Hemi Gen III platform and built to exacting standards to ensure a precise fit and long-lasting performance.

Key Features:

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

• +9cc dome top for increased compression and improved combustion efficiency
• Comp height of 1.21 inches for optimal piston-to-head clearance
• .945-inch pin diameter compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm for reliable ring sealing and durability
• Designed for a 3.578-inch stroke and 6.243-inch connecting rod length
• Approximate compression ratios vary by combustion chamber volume: 65cc–12.12, 74cc–10.75, 85cc–9.47
• Forged construction for superior strength and resistance to high stress
• Precision machining ensures consistent performance and fitment

Construction & Design:

Manufactured from high-grade forged aluminum alloy, these pistons deliver exceptional strength-to-weight ratio, allowing them to withstand the rigors of high-performance and forced induction applications. The dome top design not only increases compression but also promotes efficient air-fuel mixture combustion, contributing to improved power and throttle response.

The pistons are CNC-machined to tight tolerances, ensuring precise ring groove dimensions and pin bore alignment. This attention to detail reduces friction and wear, enhancing engine longevity. The option for full-floating or press-fit wrist pins provides flexibility depending on your engine build preferences.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, specifically the 347 Small Block Mopar Hemi Gen III platform. Installation requires standard engine rebuild procedures, including proper ring end gap setting and piston orientation. Due to the +9cc dome volume, it is important to verify piston-to-valve clearance and combustion chamber volume to achieve the desired compression ratio and avoid interference.

Professional installation is recommended to ensure optimal performance and reliability. These pistons are compatible with stock and aftermarket components designed for the 5.7L Hemi engine.

What's Included:

• Set of forged +9cc dome top pistons (quantity as per SKU)
• Wrist pins (full-floating or press-fit depending on configuration)
• Ring grooves machined to specified dimensions
• Installation guidelines and specifications

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and professional shops looking to upgrade or rebuild Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. It suits applications ranging from street performance to moderate racing builds where increased compression and durability are desired. These pistons provide a solid foundation for enhancing power output while maintaining engine reliability.

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.