DSS Racing FX Series Forged +4cc Dome Top Pistons Set

Chrysler / Dodge / Jeep / Ram 6.2L Hellcat & 6.4L 392 Gen III Hemi

1-6817-4090 / 2-6817-4090 / 3-6817-4090 / K1-6817-4090 / K2-6817-4090 / K3-6817-4090

Overview:

The DSS Racing FX Series Forged +4cc Dome Top Pistons Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat and 6.4L 392 Gen III Hemi engines. Designed to enhance performance and reliability, these pistons are ideal for enthusiasts and professional builders seeking to maximize power output while maintaining engine durability. Featuring a +4cc dome top design, they offer increased compression ratios tailored to various combustion chamber sizes, making them a versatile upgrade for high-performance applications.

These pistons are precision-crafted to meet the demanding requirements of the 426 Small Block Mopar Hemi Gen III platform, ensuring optimal fitment and function. Whether building a street, track, or drag racing engine, the DSS Racing FX Series pistons provide a solid foundation for improved combustion efficiency and power gains.

Key Features:

Engineered for high-performance Mopar Gen III Hemi engines, these pistons deliver a combination of strength, precision, and enhanced combustion characteristics:

• +4cc dome top design to increase compression ratio and improve combustion efficiency
• Comp height of 1.12" optimized for Gen III Hemi applications
• .927" pin diameter compatible with full-floating or press-fit configurations
• Ring groove dimensions: 1.2mm top and second grooves, 3mm oil ring groove for superior sealing
• Compatible with 4.050" stroke and 6.125" connecting rods for precise engine geometry
• Available in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios from approximately 10.73:1 to 13.53:1
• Manufactured by DSS Racing, a trusted name in high-performance forged components
• Designed specifically for Chrysler / Dodge / Jeep / Ram 6.4L 392 and 6.2L Hellcat & Trackhawk engines

Construction & Design:

These pistons are forged from premium-grade aluminum alloy, providing an excellent balance of strength, heat resistance, and lightweight characteristics essential for high-revving performance engines. The forging process ensures a dense, uniform grain structure that enhances durability under extreme combustion pressures and temperatures.

The dome top design increases the piston’s compression volume by +4cc, allowing for higher compression ratios that improve power and throttle response. Precision machining guarantees tight tolerances for optimal ring sealing and piston-to-wall clearance, reducing friction and wear. The pistons accommodate either full-floating or press-fit wrist pins, offering flexibility depending on engine build preferences.

Installation & Fitment:

These pistons are designed as direct replacements for the 426 Small Block Mopar Gen III Hemi engines found in Chrysler, Dodge, Jeep, and Ram vehicles equipped with 6.2L Hellcat and 6.4L 392 powerplants. Installation requires standard engine assembly procedures, with attention to proper ring end gap and piston orientation.

Due to the +4cc dome volume, builders should verify combustion chamber volumes and adjust head gasket thickness or deck height as needed to achieve the desired compression ratio. No major modifications are typically required, making these pistons a straightforward upgrade for performance builds.

What's Included:

• Set of forged +4cc dome top pistons (quantity as per engine requirements)
• Wrist pins compatible with full-floating or press-fit installation
• Ring groove machining for 1.2mm top and second rings, 3mm oil ring
• Technical specifications and installation guidelines

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, or Ram Gen III Hemi engines. It suits applications ranging from street performance to track and drag racing where increased compression and durability are critical. Builders seeking to extract maximum power from their 6.2L Hellcat or 6.4L 392 engines will benefit from the precision engineering and robust construction of DSS Racing’s FX Series pistons.

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.