DSS Racing Forged +4cc Dome Top Piston Set

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6827-4055 / 2-6827-4055 / 3-6827-4055 / K1-6827-4055 / K2-6827-4055 / K3-6827-4055

Overview:

The DSS Racing Forged +4cc Dome Top Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Designed to enhance performance and durability, these pistons are ideal for enthusiasts and professional builders seeking to increase compression and optimize combustion efficiency. With a 4.055" bore size and a +4cc dome top design, these pistons provide a precise fit and improved power potential for the 370 Small Block Mopar Hemi Gen III platform.

Whether you are rebuilding your engine or upgrading for higher horsepower applications, this piston set offers a reliable solution that balances strength and performance for street or track use.

Key Features:

These forged pistons incorporate advanced design elements to meet the demands of high-performance Mopar engines:

• +4cc dome top for increased compression and improved combustion
• 4.055" bore diameter, compatible with most 6.1L SRT8 engine blocks
• Pin diameter of .984" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for optimal ring sealing
• Comp height of 1.21 inches, designed for precise piston-to-valve clearance
• Compatible with 3.578" stroke crankshafts and 6.243" connecting rods
• Available in multiple combustion chamber volume options: 65cc, 74cc, and 85cc
• Approximate compression ratios ranging from 9.47:1 to 11.91:1 depending on chamber volume
• Manufactured by DSS Racing, a trusted name in high-performance forged components

Construction & Design:

Crafted from high-grade forged aluminum alloy, these pistons are built to withstand the extreme pressures and temperatures found in high-performance Hemi engines. The forging process enhances the material’s strength and fatigue resistance, ensuring long-lasting durability under demanding conditions. The dome top design increases the compression ratio, improving power output and throttle response.

Precision machining ensures tight tolerances for optimal ring sealing and piston-to-cylinder wall fitment. The pistons are compatible with both full-floating and press-fit wrist pins, allowing flexibility depending on your engine build preferences. The ring grooves are designed to accommodate standard 1.2mm top and second rings with a 3mm oil ring, balancing oil control and durability.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines equipped with a 4.055" bore. Installation requires standard engine rebuilding procedures, including proper honing and cleaning of the cylinder bores. Depending on your build, you may choose either full-floating or press-fit wrist pins, which are included in the options. No major modifications are typically necessary, but professional installation is recommended to ensure optimal performance and reliability.

What's Included:

• Four forged +4cc dome top pistons with 4.055" bore diameter
• Wrist pins (.984") with options for full-floating or press-fit installation
• Ring grooves machined for 1.2/1.2/3mm piston rings (rings not included)
• Detailed specifications and fitment information

Ideal For:

This piston set is perfect for Mopar enthusiasts rebuilding or upgrading their 6.1L SRT8 engines who want to increase compression and improve power output. It suits street performance builds, weekend racers, and professional engine builders seeking reliable, high-quality forged pistons designed specifically for the Gen III Hemi platform.

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.