DSS Racing Forged +9cc Dome Top Piston Set

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

1-6718-3937 / 2-6718-3937 / 3-6718-3937 / K1-6718-3937 / K2-6718-3937 / K3-6718-3937

Overview:

The DSS Racing Forged +9cc Dome Top Piston Set is engineered specifically for the 5.7L Gen III Hemi engines found in a wide range of Chrysler, Dodge, Jeep, and Ram vehicles. Designed to enhance combustion efficiency and support higher performance builds, these pistons offer a +9cc dome top design that increases compression ratios for improved power output. Ideal for enthusiasts and professional builders seeking durable, high-quality components, this piston set delivers reliable strength and precision fitment for small block Mopar Hemi applications.

Whether you are upgrading your engine for street performance, racing, or heavy-duty use, these pistons provide the foundation for a robust and responsive powertrain. Their compatibility with full-floating or press-fit wrist pins adds versatility to your build, ensuring optimal performance and longevity.

Key Features:

Designed with advanced engineering and precision manufacturing, the DSS Racing Forged Pistons offer several key benefits:

• +9cc dome top design to increase compression ratio and combustion efficiency
• Compatible with 3.937" bore size for 5.7L Gen III Hemi engines
• Pin diameter of .927" suitable for full-floating or press-fit configurations
• Ring groove dimensions of 1.2/1.2/3mm for optimal sealing and durability
• Comp height of 1.21" to maintain proper piston-to-valve clearance
• Forged construction for superior strength and resistance to high-stress conditions
• Designed for use with 6.243" connecting rods and 3.578" stroke crankshafts
• Approximate compression ratios vary by combustion chamber volume: 12.15:1 (65cc), 10.78:1 (74cc), and 9.5:1 (85cc)
• Precision balanced for smooth engine operation and reduced vibration

Construction & Design:

These pistons are forged from high-grade aluminum alloy, providing an excellent strength-to-weight ratio essential for high-performance engines. The forging process enhances the metal’s grain structure, resulting in pistons that withstand extreme combustion pressures and temperatures without compromising durability. The +9cc dome top design is carefully engineered to optimize combustion chamber shape, improving flame propagation and power output.

The pistons feature precise machining to accommodate full-floating or press-fit wrist pins, allowing builders to tailor the setup to their specific application and performance goals. Ring grooves are cut to exact specifications to ensure proper ring seating and sealing, which is critical for maintaining compression and minimizing blow-by.

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 a 3.937" bore size and is compatible with standard 6.243" connecting rods and a 3.578" stroke crankshaft. The pistons’ comp height of 1.21" ensures proper clearance within the combustion chamber, but professional installation and precise measurements are recommended to achieve optimal results.

These pistons are suitable for rebuilds, performance upgrades, and custom engine builds. Depending on your engine’s configuration, you may need to verify wrist pin compatibility and ring end gaps to ensure a perfect fit.

What's Included:

• Set of forged +9cc dome top pistons (quantity as required for engine)
• Compatible wrist pins (full-floating or press-fit options)
• Precision-cut piston rings (1.2/1.2/3mm ring groove dimensions)
• Installation guidelines and specifications

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and professional tuners looking to upgrade or rebuild 5.7L Gen III Hemi engines with enhanced compression and durability. It is well-suited for street performance, drag racing, and other high-performance applications where reliability and power gains are paramount.

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.