DSS Racing FX Series Forged +4cc Dome Top Pistons

Fits Most Chrysler / Dodge / Jeep / Ram 6.2L Hellcat & Trackhawk Models

1-6857-4090 / 2-6857-4090 / 3-6857-4090 / K1-6857-4090 / K2-6857-4090 / K3-6857-4090

Overview:

The DSS Racing FX Series Forged +4cc Dome Top Pistons are precision-engineered performance components designed specifically for Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk engines. Crafted to enhance combustion efficiency and durability, these pistons are ideal for enthusiasts and professional builders seeking to maximize power output and reliability in high-performance applications.

Featuring a +4cc dome top design, these pistons increase compression ratios while maintaining optimal combustion chamber shape. They are compatible with the 376 Small Block Mopar Hemi Gen III platform and engineered to fit a 4.090" bore, making them a direct fit for most Hellcat engines without extensive modifications.

Key Features:

Designed with advanced engineering and high-quality materials, the DSS Racing FX Series pistons offer a range of features that support enhanced engine performance and longevity:

• Forged construction for superior strength and durability under extreme conditions
• +4cc dome top design to increase compression and improve combustion efficiency
• Compatible with 4.090" bore size, fitting most Chrysler/Dodge/Jeep/Ram 6.2L Hellcat and Trackhawk engines
• Comp height of 1.275" for precise piston-to-deck clearance and optimal quench
• Ring groove dimensions of 1.2/1.2/3mm to accommodate high-performance piston rings
• Pin diameter of .945" available in full-floating or press-fit options for versatility
• Designed for use with 6.2" connecting rods and a 3.578" stroke
• Available in multiple compression volume options (65cc, 74cc, 85cc) to tailor compression ratios from approximately 9.59:1 to 12.06:1

Construction & Design:

Each piston is forged from premium-grade aluminum alloy, ensuring a lightweight yet robust component capable of withstanding the high pressures and temperatures typical of forced induction Hellcat engines. The dome top shape is precisely machined to optimize combustion chamber dynamics, promoting efficient flame propagation and reducing the risk of detonation.

The pistons feature carefully engineered ring grooves and pin bosses to maintain ring seal integrity and reduce friction. The option for full-floating or press-fit wrist pins allows builders to select the best fitment for their specific engine build and performance goals.

Installation & Fitment:

These pistons are designed as direct replacements for most 6.2L Hellcat and Trackhawk engines, requiring minimal modifications during installation. Their compatibility with the 4.090" bore and standard stroke and rod lengths ensures a straightforward swap for performance upgrades or engine rebuilds.

Professional installation is recommended to ensure proper piston ring end gap, pin fitment, and torque specifications are met for optimal engine reliability and performance.

What's Included:

• Set of four DSS Racing FX Series Forged +4cc Dome Top Pistons
• Choice of full-floating or press-fit wrist pins (depending on SKU)
• Detailed specifications for ring groove dimensions and piston geometry

Ideal For:

These pistons are perfect for performance enthusiasts, engine builders, and racers looking to upgrade their Hellcat or Trackhawk engines for increased compression and durability. They are especially suited for forced induction setups, street performance builds, and track applications where reliability under high boost and RPM is critical.

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.