DSS Racing FX Series Forged Flat Top Piston Set

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6800-4075 / 2-6800-4075 / 3-6800-4075 / K1-6800-4075 / K2-6800-4075 / K3-6800-4075

Overview:

The DSS Racing FX Series Forged Flat Top Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines. Designed to replace factory pistons, this set offers enhanced strength and durability for high-performance applications. Whether you are building a street performance engine or a track-focused powerplant, these pistons provide reliable operation under demanding conditions.

Constructed to exacting standards, the FX Series pistons deliver improved combustion efficiency with their flat top design and optimized compression ratios. They are ideal for enthusiasts seeking to maximize power output while maintaining engine longevity.

Key Features:

This piston set incorporates advanced features tailored for the Mopar 6.1L HEMI platform:

• Forged aluminum construction for superior strength and lightweight performance
• Flat top design with a -1.5cc dish to optimize combustion chamber shape
• Comp height of 1.09" for precise deck clearance and piston-to-valve clearance
• Pin diameter of .927" available in full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm / 1.2mm / 3mm for modern ring packages
• Compatible with 4.075" bore and 4.050" stroke setups
• Rod length compatibility of 6.125" for stock and aftermarket connecting rods
• Available in multiple compression ratios: approximately 12.47:1 (65cc), 11.25:1 (74cc), and 10.07:1 (85cc) depending on combustion chamber volume

Construction & Design:

Each piston is forged from high-grade aluminum alloy, ensuring excellent strength-to-weight ratio and resistance to thermal and mechanical stress. The flat top design reduces detonation risk and promotes efficient flame propagation within the combustion chamber. Precision machining guarantees tight tolerances for optimal ring sealing and minimal friction.

The pistons are designed to fit the Gen III 423 Small Block Mopar HEMI architecture, with careful attention to pin fitment options—either full-floating or press-fit—to accommodate various engine build preferences. Ring grooves are engineered to accept modern ring sets, enhancing durability and sealing performance under high boost or high RPM conditions.

Installation & Fitment:

This piston set is a direct fit for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, making it a straightforward upgrade for rebuilds or performance builds. Installation requires standard engine assembly procedures, including proper ring end gap setting and piston orientation. No major modifications are necessary when used with compatible rods and cylinders within the specified bore and stroke dimensions.

What's Included:

• Set of forged flat top pistons (quantity as required for engine configuration)
• Choice of full-floating or press-fit wrist pins
• Detailed specifications for bore, stroke, and compression ratios

Ideal For:

This piston set is ideal for performance enthusiasts and engine builders upgrading or rebuilding 6.1L SRT8 engines who demand enhanced durability and power potential. It suits street performance, drag racing, and road course applications where reliable high-RPM operation and improved combustion efficiency are 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.