DSS Racing FX Series Forged Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 6.2L Hellcat & 6.4L Models

1-6815-4100 / 2-6815-4100 / 3-6815-4100 / K1-6815-4100 / K2-6815-4100 / K3-6815-4100

Overview:

The DSS Racing FX Series Forged Piston Set is engineered for high-performance applications in Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.2L Hellcat and 6.4L 392 HEMI engines. Designed specifically for the 428 Small Block Mopar HEMI Gen III platform, these pistons offer a perfect balance of strength, durability, and precision fitment. Whether you're building a street machine, a track car, or a high-output daily driver, these forged pistons provide the reliability and performance needed to handle increased power and boost levels.

With a bore size of 4.100", these pistons are optimized for engines with a 4.050" stroke and 6.125" rod length, delivering consistent combustion chamber volumes and compression ratios tailored for various performance setups. The FX Series pistons are ideal for enthusiasts and professional builders seeking to upgrade their engine internals with components that maintain OEM compatibility while enhancing strength and thermal resistance.

Key Features:

Built to meet the demands of high-performance Mopar engines, the DSS Racing FX Series Forged Pistons include the following key features:

• Precision forged from high-strength aluminum alloy for superior durability and weight savings
• Compensated dish top design with -18cc dish volume to optimize combustion chamber shape and compression
• Pin diameter of .927" compatible with full-floating or press-fit wrist pins
• Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate performance ring sets
• Compression heights of 1.12" for proper deck clearance and piston-to-valve clearance
• Designed for 4.100" bore applications, matching factory and aftermarket cylinder bore sizes
• Compatible with 4.050" stroke crankshafts and 6.125" connecting rods
• Available in multiple dish volumes (65cc, 74cc, 85cc) to achieve approximate compression ratios ranging from 8.86 to 10.57
• Engineered for use in 6.2L Hellcat, 6.4L 392, and Trackhawk engines for Chrysler, Dodge, Jeep, and Ram models

Construction & Design:

The DSS Racing FX Series pistons are crafted using advanced forging techniques that enhance the metal grain structure, resulting in pistons that withstand extreme combustion pressures and temperatures. The aluminum alloy used is lightweight yet incredibly strong, reducing reciprocating mass and improving engine response. The dish top design with a -18cc volume helps control compression and combustion characteristics, making these pistons suitable for forced induction or naturally aspirated setups.

Each piston features precision-machined ring grooves to ensure optimal ring seal and reduced friction. The wrist pin bore is engineered for either full-floating or press-fit pins, providing flexibility depending on your engine build preferences. The pistons are designed to maintain tight tolerances for bore size and compression height, ensuring a perfect fit and reliable performance in high-stress environments.

Installation & Fitment:

These pistons are direct fit replacements for most Chrysler, Dodge, Jeep, and Ram engines with 6.2L Hellcat and 6.4L 392 HEMI configurations. Installation requires standard engine assembly procedures, including proper honing of cylinder bores to 4.100" and careful measurement of piston-to-wall clearance. The pistons are compatible with factory or aftermarket connecting rods measuring 6.125" in length and crankshafts with a 4.050" stroke.

Builders should verify compression ratios based on their specific combustion chamber volumes and gasket thicknesses, as the pistons come in various dish volumes to accommodate different setups. Professional installation is recommended to ensure optimal engine performance and longevity.

What's Included:

• Set of forged pistons (quantity as per engine requirements)
• Specifications for bore size, compression height, and ring groove dimensions
• Technical data sheet with piston dimensions and recommended clearances

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler, Dodge, Jeep, and Ram HEMI engines. It suits applications ranging from street performance and drag racing to road course and off-road use, especially where increased power and durability are required. The DSS Racing FX Series pistons provide a reliable foundation for forced induction builds, high compression naturally aspirated engines, and any project demanding robust internal components.

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.