DSS Racing FX Series Forged Piston Set
Fits Chrysler, Dodge, Jeep, Ram 6.1L SRT8 Models
1-6840-4065D / 2-6840-4065D / 3-6840-4065D / K1-6840-4065D / K2-6840-4065D / K3-6840-4065D
Overview:
The DSS Racing Gen III Hemi FX Series Forged Piston Set is engineered specifically for the 6.1L SRT8 engines found in Chrysler, Dodge, Jeep, and Ram vehicles. Designed to meet the demands of high-performance applications, these pistons offer exceptional strength and durability while maintaining optimal weight for improved engine response. Whether you're rebuilding or upgrading your small block Mopar Hemi, this piston set delivers reliable performance and precision fitment.
Ideal for enthusiasts and professional builders alike, these pistons provide a solid foundation for increased power output and engine longevity. Their forged construction ensures they can withstand the rigors of boosted or naturally aspirated setups without compromising reliability.
Key Features:
Built with advanced engineering and precision manufacturing, the DSS Racing FX Series pistons include the following key features:
- Compatible with 4.065" bore size for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines
- Forged construction for superior strength and durability under high stress
- Flat top design with -1.5cc volume for optimized combustion chamber dynamics
- Comp height of 1.21" for precise piston-to-deck clearance
- .927" wrist pin diameter with options for full-floating or press-fit installation
- Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate high-performance piston rings
- Designed for a 3.578" stroke and 6.243" connecting rod length, matching factory specifications
- Available in multiple compression ratios: 65cc (11.06:1), 74cc (9.99:1), and 85cc (8.95:1)
Construction & Design:
Each piston in the DSS Racing FX Series is forged from high-grade aluminum alloy, providing an excellent balance of strength and lightweight properties. The forging process enhances the grain structure of the metal, resulting in pistons that resist cracking, scuffing, and thermal fatigue even under extreme operating conditions.
The flat top design with a slight dish volume (-1.5cc) optimizes combustion efficiency and helps control detonation in high-compression setups. Precision machining ensures tight tolerances for piston-to-cylinder wall clearance and ring groove dimensions, promoting consistent sealing and reduced blow-by.
Installation & Fitment:
This piston set is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines equipped with a 4.065" bore. Installation requires standard engine rebuild procedures, including proper honing and cleaning of the cylinder bores. The wrist pins can be installed as either full-floating or press-fit, depending on your build preference and hardware availability.
Due to the precise engineering and OEM-compatible dimensions, no additional modifications are typically necessary, making these pistons an excellent choice for both performance upgrades and reliable rebuilds.
What's Included:
- Set of forged pistons sized for 4.065" bore
- Wrist pins (.927" diameter) compatible with full-floating or press-fit installation
- Detailed specifications for compression ratios and piston dimensions
Ideal For:
This piston set is ideal for performance enthusiasts, engine builders, and racers seeking a durable and reliable upgrade for their 6.1L SRT8 Hemi engines. Whether you are building a naturally aspirated street machine or a boosted race engine, these pistons provide the strength and precision needed to handle increased power levels while maintaining engine longevity.
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 Gen III Hemi FX Series Forged Piston Set 4.065" Bore: Fits most Hemi Models
- Unit price
- /per
What does the Available to Promise date mean?
ETA stands for Estimated Time of Arrival. The date shown is calculated using our Available-to-Promise (ATP) system, which tracks real-time supplier commitments to determine when a product is expected to be available for delivery. Specifically, the date is calculated by adding 9 business days from the date a supplier has committed to ship the product, representing a worst-case scenario for when we can expect to receive inventory.
Please note: The ETA is an estimate, not a guarantee. While we work closely with our suppliers to keep dates as accurate as possible, delays due to shipping carriers, weather, customs, or supplier-side issues may occasionally push the actual arrival beyond the date shown. Likewise, inventory may arrive sooner than the ETA in many cases. If you would like to be notified for when this item arrives, sign up for our back in stock notifications!
1-6840-4065D DSS Racing 05-10 Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Gen III Hemi FX Series Forged Piston Set. Designed for high-performance 6.1L SRT8 engines, these forged pistons offer exceptional strength and durability. Featuring a 4.065" bore, flat top design, and precise ring grooves, they optimize combustion efficiency and power output. Ideal for enthusiasts seeking reliable, race-ready components that withstand extreme conditions while enhancing engine response and longevity.
FREE GROUND SHIPPING
MADE IN THE USA
Adding product to your cart
DSS Racing FX Series Forged Piston Set
Fits Chrysler, Dodge, Jeep, Ram 6.1L SRT8 Models
1-6840-4065D / 2-6840-4065D / 3-6840-4065D / K1-6840-4065D / K2-6840-4065D / K3-6840-4065D
Overview:
The DSS Racing Gen III Hemi FX Series Forged Piston Set is engineered specifically for the 6.1L SRT8 engines found in Chrysler, Dodge, Jeep, and Ram vehicles. Designed to meet the demands of high-performance applications, these pistons offer exceptional strength and durability while maintaining optimal weight for improved engine response. Whether you're rebuilding or upgrading your small block Mopar Hemi, this piston set delivers reliable performance and precision fitment.
Ideal for enthusiasts and professional builders alike, these pistons provide a solid foundation for increased power output and engine longevity. Their forged construction ensures they can withstand the rigors of boosted or naturally aspirated setups without compromising reliability.
Key Features:
Built with advanced engineering and precision manufacturing, the DSS Racing FX Series pistons include the following key features:
- Compatible with 4.065" bore size for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines
- Forged construction for superior strength and durability under high stress
- Flat top design with -1.5cc volume for optimized combustion chamber dynamics
- Comp height of 1.21" for precise piston-to-deck clearance
- .927" wrist pin diameter with options for full-floating or press-fit installation
- Ring groove dimensions of 1.2mm/1.2mm/3mm to accommodate high-performance piston rings
- Designed for a 3.578" stroke and 6.243" connecting rod length, matching factory specifications
- Available in multiple compression ratios: 65cc (11.06:1), 74cc (9.99:1), and 85cc (8.95:1)
Construction & Design:
Each piston in the DSS Racing FX Series is forged from high-grade aluminum alloy, providing an excellent balance of strength and lightweight properties. The forging process enhances the grain structure of the metal, resulting in pistons that resist cracking, scuffing, and thermal fatigue even under extreme operating conditions.
The flat top design with a slight dish volume (-1.5cc) optimizes combustion efficiency and helps control detonation in high-compression setups. Precision machining ensures tight tolerances for piston-to-cylinder wall clearance and ring groove dimensions, promoting consistent sealing and reduced blow-by.
Installation & Fitment:
This piston set is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines equipped with a 4.065" bore. Installation requires standard engine rebuild procedures, including proper honing and cleaning of the cylinder bores. The wrist pins can be installed as either full-floating or press-fit, depending on your build preference and hardware availability.
Due to the precise engineering and OEM-compatible dimensions, no additional modifications are typically necessary, making these pistons an excellent choice for both performance upgrades and reliable rebuilds.
What's Included:
- Set of forged pistons sized for 4.065" bore
- Wrist pins (.927" diameter) compatible with full-floating or press-fit installation
- Detailed specifications for compression ratios and piston dimensions
Ideal For:
This piston set is ideal for performance enthusiasts, engine builders, and racers seeking a durable and reliable upgrade for their 6.1L SRT8 Hemi engines. Whether you are building a naturally aspirated street machine or a boosted race engine, these pistons provide the strength and precision needed to handle increased power levels while maintaining engine longevity.
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.
-
-
YEARMAKEMODELSUBMODEL2006 - 2010Chrysler300C6.1L SRT82008 - 2010DodgeChallenger6.1L SRT82006 - 2010DodgeCharger6.1L SRT82006 - 2008DodgeMagnum6.1L SRT82006 - 2010JeepGrand Cherokee6.1L SRT8
-
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
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 | |||||