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

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

1-6728-3937 / 2-6728-3937 / 3-6728-3937 / K1-6728-3937 / K2-6728-3937 / K3-6728-3937

Overview:

The DSS Racing FX Series +9cc Dome Top Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines. Designed to enhance performance and durability, these pistons are ideal for enthusiasts and professional builders seeking reliable, high-quality components for their small block Mopar Hemi Gen III builds. Featuring a +9cc dome top design, these pistons help optimize compression ratios for improved combustion efficiency and power output.

Whether you are rebuilding your engine or upgrading for increased performance, this piston set offers a perfect balance of strength, precision, and compatibility with factory and aftermarket components.

Key Features:

These forged pistons incorporate advanced design elements and manufacturing techniques to deliver superior performance and longevity:

• +9cc dome top design for increased compression and power potential
• Comp height of 1.21" for precise piston-to-deck clearance
• .945" pin diameter compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm/1.2mm/3mm for optimal ring sealing and durability
• Compatible with 3.578" stroke and 6.243" rod length setups
• Available in multiple combustion chamber volumes: 65cc (12.15 compression ratio), 74cc (10.78 compression ratio), and 85cc (9.5 compression ratio)
• Precision forged construction for enhanced strength and thermal resistance
• Designed specifically for the 348 Small Block Mopar Hemi Gen III FX engines

Construction & Design:

Manufactured using high-grade forged aluminum alloy, these pistons offer exceptional strength-to-weight ratio and excellent heat dissipation properties. The dome top shape is engineered to improve combustion chamber dynamics, promoting efficient flame travel and reducing detonation risk. The pistons are CNC-machined to tight tolerances, ensuring consistent fitment and performance across all cylinders.

The pin bore is designed to accommodate either full-floating or press-fit wrist pins, providing flexibility depending on your engine build preferences. The ring grooves are precisely cut to maintain ring stability and sealing under high-performance conditions.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, specifically the Gen III small block Mopar Hemi platform. Installation requires standard engine rebuilding procedures, including proper ring end gap setting and piston orientation. These pistons are compatible with factory rods and crankshafts matching the specified stroke and rod length dimensions.

Due to the +9cc dome volume, it is important to verify combustion chamber size and piston-to-valve clearance during installation to ensure optimal performance and avoid interference.

What's Included:

• Set of forged aluminum pistons with +9cc dome tops
• Precision-machined piston pins (compatible with full-floating or press-fit)
• Ring groove machined pistons ready for ring installation

Ideal For:

This piston set is ideal for engine builders, performance enthusiasts, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. It suits applications requiring increased compression ratios and enhanced durability, including street performance, mild to moderate racing, and custom engine builds.

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.