DSS Racing FX Series Forged Flat Top Piston Set

Chrysler / Dodge / Jeep / Ram 6.1L SRT8

1-6840-4075 / 2-6840-4075 / 3-6840-4075 / K1-6840-4075 / K2-6840-4075 / K3-6840-4075

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, including the 373 Small Block Mopar Hemi Gen III. Designed for enthusiasts and professional builders seeking enhanced durability and performance, these pistons offer a reliable upgrade over stock components. Their flat top design and precise specifications help optimize combustion efficiency and power output while maintaining engine reliability under demanding conditions.

Ideal for high-performance street and track applications, this piston set supports increased compression ratios and improved engine response, making it a perfect choice for those looking to maximize the potential of their 6.1L SRT8 powerplants.

Key Features:

The DSS Racing FX Series pistons incorporate advanced engineering and quality materials to deliver superior performance and longevity. Key features include:

• Compatible with Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines
• 4.075" bore size tailored for 373 Small Block Mopar Hemi Gen III
• Flat top piston design with -1.5cc volume for optimized combustion
• Comp height of 1.21" for precise deck clearance
• .927" wrist pin diameter, available in full-floating or press-fit options
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring
• Stroke compatibility of 3.578" with 6.243" connecting rods
• Approximate compression ratios ranging from 9.0 to 11.11 depending on combustion chamber volume
• Forged construction for enhanced strength and durability under high stress

Construction & Design:

These pistons are crafted from high-quality forged aluminum alloy, providing an excellent balance of strength, weight, and thermal conductivity. The flat top design reduces quench area and promotes efficient combustion, which can improve power delivery and throttle response. The pistons are engineered with precise tolerances to ensure optimal fitment and performance in the 6.1L SRT8 engine platform.

The wrist pins are available in both full-floating and press-fit configurations, allowing builders to select the best option for their application and durability requirements. The ring grooves are machined to exact specifications to accommodate standard ring sizes, ensuring proper sealing and oil control.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 models equipped with a 4.075" bore. Installation requires standard engine assembly procedures and may involve measuring and verifying clearances to ensure proper piston-to-cylinder wall fitment. No major modifications are typically necessary when replacing stock pistons with this set, making it a straightforward upgrade for engine rebuilds or performance builds.

What's Included:

• Set of forged flat top pistons (quantity as required for engine)
• Wrist pins (.927" diameter), full-floating or press-fit options
• Ring grooves pre-machined for 1.2/1.2/3mm piston rings (rings not included)

Ideal For:

• Performance enthusiasts upgrading their 6.1L SRT8 engines
• Engine builders seeking durable forged pistons for street or track use
• Rebuild projects requiring reliable, high-quality piston components
• Applications demanding improved compression and combustion efficiency

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.