DSS Racing FX Series Forged Flat Top Pistons

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

1-6860-4090 / 2-6860-4090 / 3-6860-4090 / K1-6860-4090 / K2-6860-4090 / K3-6860-4090

Overview:

The DSS Racing FX Series Forged Flat Top Pistons are precision-engineered performance components designed specifically for the Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk engines. Crafted to handle the extreme demands of high-performance and forced induction applications, these pistons offer enhanced strength, durability, and reliability over stock components. Ideal for enthusiasts and professional builders looking to maximize power output while maintaining engine longevity, these pistons provide a solid foundation for serious engine builds.

With a bore size of 4.090" and a compact flat top design, these pistons optimize combustion efficiency and compression ratios, contributing to improved throttle response and power delivery. Whether upgrading a street machine or building a track-ready powerhouse, the DSS Racing FX Series pistons deliver consistent performance under high stress conditions.

Key Features:

Engineered for high-performance Mopar Hemi applications, these pistons incorporate advanced design elements to meet the rigorous demands of modern muscle cars and trucks:

• Forged 2618 aluminum alloy construction for superior strength and heat resistance
• Flat top design with a -1.5cc dish for optimized combustion chamber volume
• Comp height of 1.275" tailored for Gen III 376 Small Block Mopar Hemi engines
• Pin diameter of .927" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm to accommodate high-performance piston rings
• Stroke compatibility of 3.578" and rod length of 6.2" for precise engine geometry
• Available in multiple compression ratios approximately 11.2:1 (65cc), 10.11:1 (74cc), and 9.06:1 (85cc) to suit various tuning requirements
• Designed to fit most Chrysler / Dodge / Jeep / Ram 6.2L Hellcat and Trackhawk models

Construction & Design:

Each piston is forged from premium 2618 aluminum alloy, known for its excellent strength-to-weight ratio and resistance to thermal fatigue. The forging process enhances grain structure, resulting in pistons that withstand the high cylinder pressures and temperatures typical of boosted and high-horsepower engines. The flat top design with a slight dish volume ensures optimal combustion efficiency and helps control detonation under aggressive tuning.

The pistons feature precision-machined ring grooves and pin bores to ensure proper ring seal and wrist pin fitment, whether using full-floating or press-fit pins. This attention to detail reduces friction and wear, contributing to longer engine life and consistent performance. The combination of compact compression heights and tailored bore size allows for easy integration into existing engine builds without extensive modifications.

Installation & Fitment:

These DSS Racing FX Series pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.2L Hellcat and Trackhawk engines. Installation requires standard engine assembly procedures, including proper ring end gap setting and wrist pin installation. Depending on the specific engine build and compression ratio selected, minor adjustments to head gasket thickness or deck height may be necessary to achieve desired compression targets.

Professional installation is recommended to ensure optimal piston ring sealing and to maintain engine reliability. These pistons are compatible with existing connecting rods and crankshafts specified in the fitment, making them a straightforward upgrade for performance builds.

What's Included:

• Set of forged flat top pistons (quantity as required per engine)
• Precision-machined wrist pin bores
• Ring grooves sized for high-performance piston rings
• Installation guidelines and specifications

Ideal For:

These DSS Racing FX Series pistons are ideal for:

• Performance enthusiasts upgrading Hellcat and Trackhawk engines
• Engine builders seeking durable forged pistons for forced induction setups
• Street and track applications requiring reliable high-compression components
• Rebuilds and upgrades aiming to increase power output without sacrificing 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.