DSS Racing Forged +9cc Dome Top Piston Set

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

1-6728-3917 / 2-6728-3917 / 3-6728-3917 / K1-6728-3917 / K2-6728-3917 / K3-6728-3917

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 combustion efficiency and increase compression ratios, these pistons are ideal for enthusiasts looking to boost engine performance and reliability. Whether you are building a high-performance street machine or a race-ready engine, this piston set delivers precision and durability to meet demanding conditions.

Featuring a +9cc dome top design, these pistons increase the compression ratio, improving power output and throttle response. The set is compatible with both full-floating and press-fit wrist pins, offering flexibility for various engine builds. With a bore size of 3.917" and a stroke of 3.578", these pistons are tailored to fit the 5.7L Hemi’s specifications perfectly.

Key Features:

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

• Forged construction for superior strength and resistance to high stress
• +9cc dome top to increase compression ratio and combustion efficiency
• Compatible with full-floating or press-fit wrist pins (PIN: .945")
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring
• Designed for 3.917" bore diameter and 3.578" stroke engines
• Compact dome height of 1.21" for optimal piston-to-valve clearance
• Fits 6.243" connecting rods commonly used in 5.7L Hemi builds
• Available in multiple compression volume options: 65cc, 74cc, and 85cc
• Precision machining ensures tight tolerances and consistent performance

Construction & Design:

Manufactured from high-grade forged aluminum alloy, these pistons provide an excellent balance of lightweight design and exceptional strength. The forging process enhances the metal’s grain structure, resulting in pistons that withstand the rigors of high-performance and forced induction applications. The +9cc dome top is carefully engineered to optimize combustion chamber shape and improve flame propagation.

The pistons feature precise ring grooves to accommodate standard 1.2mm compression rings and a 3mm oil ring, ensuring effective sealing and oil control. The wrist pin bore is designed for either full-floating or press-fit installation, allowing builders to tailor the setup to their engine’s needs. Overall, the design prioritizes durability, thermal efficiency, and compatibility with factory and aftermarket components.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Small Block Mopar Gen III Hemi engine. Installation requires standard engine rebuild procedures, including proper honing of the cylinder bores to the specified 3.917" diameter. The pistons are compatible with a 3.578" stroke crankshaft and 6.243" connecting rods, matching factory dimensions for a straightforward swap.

Builders should verify compression ratio requirements based on their combustion chamber volume and intended fuel type. The +9cc dome top increases compression, so tuning adjustments may be necessary to optimize performance and prevent detonation. Professional installation is recommended to ensure correct ring end gap, wrist pin fitment, and piston orientation.

What's Included:

• Set of forged +9cc dome top pistons (quantity as required for engine)
• Wrist pin bore compatible with full-floating or press-fit pins
• Precision-machined ring grooves for 1.2/1.2/3mm ring sets
• Technical specifications and installation guidelines

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding 5.7L Hemi engines. It suits applications ranging from street performance to drag racing and other motorsports where increased compression and durability are essential. The pistons offer a reliable upgrade path for those seeking to extract more power while maintaining 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.