Fits Most Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Models
1-6840-4090D / 2-6840-4090D / 3-6840-4090D / K1-6840-4090D / K2-6840-4090D / K3-6840-4090D
Overview:
The DSS Racing FX Series Gen III Hemi Forged Piston Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.1L SRT8 engine. Designed to handle the rigors of high-performance applications, these pistons offer exceptional strength and durability while maintaining optimal weight for improved engine response. Whether you are rebuilding your engine or upgrading for enhanced power and reliability, this piston set delivers precision fitment and performance consistency.
Ideal for enthusiasts and professional builders alike, these pistons support aggressive tuning and increased boost levels, making them a reliable choice for street, strip, or track use. Their forged construction ensures superior resistance to heat and stress compared to cast pistons, providing peace of mind under demanding conditions.
Key Features:
Built to exacting standards, the DSS Racing FX Series pistons incorporate advanced design elements to maximize performance and longevity:
Construction & Design:
Each piston in the FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight construction and mechanical strength. The forging process refines the metal grain structure, resulting in pistons that resist cracking and deformation under extreme thermal and mechanical loads. The flat top with a slight dish enhances combustion efficiency and helps control detonation in high-compression setups.
The pistons feature precision-machined ring grooves and pin bores to ensure optimal sealing and minimal friction. The option for full-floating or press-fit wrist pins allows builders to tailor the assembly to their specific engine build and performance goals. This attention to detail in design and manufacturing ensures reliable operation in demanding environments.
Installation & Fitment:
These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines with a 4.090" bore. Installation requires standard engine rebuilding procedures, including proper honing and cleaning of the cylinder bores. Depending on the wrist pin option selected, either full-floating or press-fit installation methods should be followed according to engine builder preferences and specifications.
Due to their precise dimensions and compatibility, these pistons fit seamlessly into Gen III Hemi configurations without the need for extensive modifications, making them an excellent choice for performance upgrades or engine rebuilds.
What's Included:
Ideal For:
This piston set is ideal for performance enthusiasts, professional engine builders, and racers seeking a durable, high-quality piston solution for the 6.1L SRT8 engine platform. It supports high compression and aggressive tuning, making it suitable for street performance, drag racing, road racing, and other motorsport applications where reliability and power are paramount.
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.
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!
1-6840-4090D DSS Racing 05-10 Chrysler / Dodge / Jeep / Ram 6.1L SRT8 FX Series Gen III Hemi Forged Piston Set. Engineered for high performance, these forged pistons feature a 4.090" bore and a -1.5cc flat top design for optimal combustion. With a comp height of 1.21 and precise ring grooves, they ensure durability and improved power output. Compatible with full-floating or press-fit pins, this set enhances reliability and efficiency in 6.1L SRT8 engines, making it ideal for enthusiasts seeking robust upgrades.
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MADE IN THE USA
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Fits Most Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Models
1-6840-4090D / 2-6840-4090D / 3-6840-4090D / K1-6840-4090D / K2-6840-4090D / K3-6840-4090D
Overview:
The DSS Racing FX Series Gen III Hemi Forged Piston Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 6.1L SRT8 engine. Designed to handle the rigors of high-performance applications, these pistons offer exceptional strength and durability while maintaining optimal weight for improved engine response. Whether you are rebuilding your engine or upgrading for enhanced power and reliability, this piston set delivers precision fitment and performance consistency.
Ideal for enthusiasts and professional builders alike, these pistons support aggressive tuning and increased boost levels, making them a reliable choice for street, strip, or track use. Their forged construction ensures superior resistance to heat and stress compared to cast pistons, providing peace of mind under demanding conditions.
Key Features:
Built to exacting standards, the DSS Racing FX Series pistons incorporate advanced design elements to maximize performance and longevity:
Construction & Design:
Each piston in the FX Series is forged from high-grade aluminum alloy, providing an excellent balance of lightweight construction and mechanical strength. The forging process refines the metal grain structure, resulting in pistons that resist cracking and deformation under extreme thermal and mechanical loads. The flat top with a slight dish enhances combustion efficiency and helps control detonation in high-compression setups.
The pistons feature precision-machined ring grooves and pin bores to ensure optimal sealing and minimal friction. The option for full-floating or press-fit wrist pins allows builders to tailor the assembly to their specific engine build and performance goals. This attention to detail in design and manufacturing ensures reliable operation in demanding environments.
Installation & Fitment:
These pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines with a 4.090" bore. Installation requires standard engine rebuilding procedures, including proper honing and cleaning of the cylinder bores. Depending on the wrist pin option selected, either full-floating or press-fit installation methods should be followed according to engine builder preferences and specifications.
Due to their precise dimensions and compatibility, these pistons fit seamlessly into Gen III Hemi configurations without the need for extensive modifications, making them an excellent choice for performance upgrades or engine rebuilds.
What's Included:
Ideal For:
This piston set is ideal for performance enthusiasts, professional engine builders, and racers seeking a durable, high-quality piston solution for the 6.1L SRT8 engine platform. It supports high compression and aggressive tuning, making it suitable for street performance, drag racing, road racing, and other motorsport applications where reliability and power are paramount.
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.
Free Standard Shipping on orders over $300. Select “Free Shipping” at checkout. *Exclusions apply on oversized and freight items.
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.
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 | |||||
Free Standard Shipping on orders over $300. Select “Free Shipping” at checkout. *Exclusions apply on oversized and freight items.
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.
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 | |||||
