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.
DSS Racing FX Series Forged Flat Top Piston Set 4.075" Bore: Fits Dodge / Chrysler / Jeep (03-23)
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1-6840-4075 DSS Racing 05-10 Chrysler / Dodge / Jeep / Ram 6.1L SRT8 FX Series Forged Flat Top Piston Set. Designed for high-performance 6.1L SRT8 engines, these forged flat top pistons offer exceptional strength and durability. Featuring a 4.075" bore and precise comp height, they deliver improved combustion efficiency and power output. The full-floating or press-fit pin options and optimized ring grooves ensure reliable operation under extreme conditions. Ideal for enthusiasts seeking enhanced engine response and longevity in their Mopar builds.
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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.
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YEARMAKEMODELSUBMODEL2006 - 2010Chrysler300C6.1L SRT82008 - 2010DodgeChallenger6.1L SRT82006 - 2010DodgeCharger6.1L SRT82006 - 2008DodgeMagnum6.1L SRT82006 - 2010JeepGrand Cherokee6.1L SRT8
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Free Standard Shipping on orders over $300. Select “Free Shipping” at checkout. *Exclusions apply on oversized and freight items.
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Compression Ratio Calculator
Calculate your engine's compression ratio and CID
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Features Piston Series E SeriesE SX SeriesSX 1-FX Series1-FX 2-FX Series2-FX 3-FX Series3-FX Broached pin oiling slots Drilled, forced wrist pin oiling Forged drain-back windows Drilled bottom ring land intersecting oil groove drain-backs Slightly larger, deeper valve reliefs than OEM CNC machined valve reliefs for moderate performance heads and cam combinations Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations Premium Aircraft spec. 4032 low expansion alloy Premium Aircraft spec. 2618 alloy Blower, Turbo, NOS ready Brushed piston crown Additional CNC milling for weight reduction Patented "X Groove" skirt for superior cylinder and ring life Thinner/shallower ring grooves for max ring seal Low volume contact reduction grooves 2nd ring land accumulator groove prevents flutter 3rd ring land scraper relief Oil ring groove relief reservoir Inner and outer pin boss weight reduction Tighter crown thickness control for lighter parts Dynamic skirt milling for consistent weight Diamond-turned high strength skirts High-strength piston pins Extreme Duty XR wrist pins Horizontal Gas Ports enhance ring seal Forged and machined in the USA
Standard shipping
Free Standard Shipping on orders over $300. Select “Free Shipping” at checkout. *Exclusions apply on oversized and freight items.
Free Easy Returns
Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.
Compression Ratio Calculator
Calculate your engine's compression ratio and CID
| Features | Piston Series | ||||
|---|---|---|---|---|---|
| E SeriesE | SX SeriesSX | 1-FX Series1-FX | 2-FX Series2-FX | 3-FX Series3-FX | |
| Broached pin oiling slots | |||||
| Drilled, forced wrist pin oiling | |||||
| Forged drain-back windows | |||||
| Drilled bottom ring land intersecting oil groove drain-backs | |||||
| Slightly larger, deeper valve reliefs than OEM | |||||
| CNC machined valve reliefs for moderate performance heads and cam combinations | |||||
| Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations | |||||
| Premium Aircraft spec. 4032 low expansion alloy | |||||
| Premium Aircraft spec. 2618 alloy | |||||
| Blower, Turbo, NOS ready | |||||
| Brushed piston crown | |||||
| Additional CNC milling for weight reduction | |||||
| Patented "X Groove" skirt for superior cylinder and ring life | |||||
| Thinner/shallower ring grooves for max ring seal | |||||
| Low volume contact reduction grooves | |||||
| 2nd ring land accumulator groove prevents flutter | |||||
| 3rd ring land scraper relief | |||||
| Oil ring groove relief reservoir | |||||
| Inner and outer pin boss weight reduction | |||||
| Tighter crown thickness control for lighter parts | |||||
| Dynamic skirt milling for consistent weight | |||||
| Diamond-turned high strength skirts | |||||
| High-strength piston pins | |||||
| Extreme Duty XR wrist pins | |||||
| Horizontal Gas Ports enhance ring seal | |||||
| Forged and machined in the USA | |||||