DSS Racing FX Series Forged Flat Top Piston Set

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6800-4055 / 2-6800-4055 / 3-6800-4055 / K1-6800-4055 / K2-6800-4055 / K3-6800-4055

Overview:

The DSS Racing FX Series Forged Flat Top Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models, delivering superior strength and performance for enthusiasts and professional builders alike. Designed to fit the 418 Small Block Mopar Hemi Gen III engines, these pistons offer a precise 4.055" bore size and a compact flat top design that optimizes combustion efficiency and power output.

Ideal for high-performance applications, these pistons provide enhanced durability under extreme conditions, making them perfect for street performance, track use, or serious rebuild projects. The set is engineered to maintain factory-like reliability while supporting increased horsepower and torque demands.

Key Features:

Built with advanced engineering and precision manufacturing, the DSS Racing FX Series pistons offer a range of features designed to maximize engine performance and longevity:

• Forged construction for superior strength and resistance to high stress
• Flat top design with a -1.5cc dish for optimized combustion chamber volume
• Comp height of 1.09" for precise piston-to-head clearance
• Pin diameter of .927" compatible with full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for reliable ring sealing
• Compatible with 4.050" stroke and 6.125" rod length setups
• Available in multiple compression ratios to suit various build goals: 65cc (12.36:1), 74cc (11.15:1), and 85cc (9.96:1)
• Precision balanced for smooth engine operation and reduced vibration

Construction & Design:

Each piston in the FX Series is forged from high-grade aluminum alloy, providing an excellent strength-to-weight ratio that withstands the rigors of high-performance and forced induction applications. The flat top design reduces quench distance and promotes efficient combustion, while the carefully engineered pin bore and ring grooves ensure durability and optimal sealing under high cylinder pressures.

The pistons are designed with versatility in mind, accommodating both full-floating and press-fit wrist pin configurations to suit different engine builds and preferences. This attention to detail ensures a precise fit and long-lasting performance in the demanding environment of the Mopar 6.1L Hemi engine.

Installation & Fitment:

These pistons are direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, designed to fit the 4.055" bore size common to these applications. Installation requires standard engine rebuild procedures and may involve balancing and clearancing to match specific build parameters. The pistons are compatible with stock or aftermarket rods and crankshafts matching the specified stroke and rod length.

Professional installation is recommended to ensure optimal piston-to-cylinder wall clearance, ring end gap, and overall engine assembly integrity.

What's Included:

• Set of forged flat top pistons (quantity as required for engine configuration)
• Wrist pins compatible with full-floating or press-fit setups
• Ring grooves pre-machined for 1.2mm top and second rings, 3mm oil ring
• Technical specifications and installation guidelines

Ideal For:

This piston set is ideal for Mopar enthusiasts and engine builders seeking a reliable, high-performance upgrade for the 6.1L SRT8 platform. Whether rebuilding a street engine, preparing a track-ready build, or upgrading for forced induction, these pistons provide the strength and precision needed to handle increased power and stress.

They are especially suited for those who want to maintain factory bore size while improving compression ratio options and durability.

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.