DSS Racing FX Series Forged Flat Top Pistons Set
Fits Most Chrysler / Dodge / Jeep / Ram 5.7L Hemi Models
1-6720-3937 / 2-6720-3937 / 3-6720-3937 / K1-6720-3937 / K2-6720-3937 / K3-6720-3937
Overview:
The DSS Racing FX Series Forged Flat Top Pistons Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, including the 348 Small Block Mopar Hemi Gen III. Designed for high-performance applications, these pistons offer a perfect balance of strength, durability, and precision fitment. Whether you are rebuilding your engine or upgrading for enhanced power and reliability, this piston set delivers consistent performance under demanding conditions.
Ideal for enthusiasts and professional builders alike, these pistons provide improved combustion efficiency and support higher compression ratios, making them suitable for street performance, mild racing, and custom engine builds.
Key Features:
Built with advanced engineering and premium materials, the DSS Racing FX Series pistons include the following features:
- Forged construction for superior strength and durability
- Flat top design with a -1.5cc dish for optimized combustion chamber volume
- Compression height of 1.21 inches for precise piston-to-deck clearance
- .945-inch 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
- Compatible with 3.578-inch stroke crankshafts and 6.243-inch connecting rods
- Available in multiple combustion chamber volumes to support approximate compression ratios of 10.5:1 (65cc), 9.5:1 (74cc), and 8.5:1 (85cc)
- Precision CNC-machined for consistent fit and finish
- Designed to fit most Chrysler / Dodge / Jeep / Ram 5.7L Hemi engines with minimal modifications
Construction & Design:
These pistons are crafted from high-grade forged aluminum alloy, providing an excellent strength-to-weight ratio that withstands the rigors of high-performance and forced induction applications. The flat top design enhances combustion efficiency by promoting a more uniform flame front and reducing detonation risks. The pistons are engineered with tight tolerances to ensure optimal ring seal and minimal friction, contributing to improved engine longevity and power output.
The wrist pin options allow for either full-floating or press-fit installation, giving builders flexibility based on their engine setup and performance goals. The ring grooves are precisely machined to accommodate performance rings that maintain excellent sealing under high cylinder pressures.
Installation & Fitment:
Installation of the DSS Racing FX Series pistons requires standard engine rebuilding procedures and is compatible with most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines. The pistons fit engines with a 3.578-inch stroke and 6.243-inch connecting rods, making them ideal for stock or mildly modified bottom ends. Minimal modifications are needed when replacing OEM pistons, but it is recommended to verify clearances and ring end gaps during installation.
These pistons are designed to work seamlessly with factory cylinder heads and standard engine components, ensuring a straightforward upgrade path for performance enthusiasts.
What's Included:
- Set of forged flat top pistons (quantity as required for engine rebuild)
- Wrist pins (.945" diameter) suitable for full-floating or press-fit installation
- Detailed specifications for compression height, ring groove dimensions, and combustion chamber volumes
Ideal For:
This piston set is ideal for automotive enthusiasts, engine builders, and racers looking to upgrade or rebuild their Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. It suits applications ranging from street performance to mild racing builds, offering enhanced durability and improved combustion characteristics. Whether you are restoring a classic Mopar Hemi or building a modern performance engine, these pistons provide a reliable foundation for increased power and 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 Pistons Set: Fits Chrysler / Dodge / Jeep / Ram 5.7L Hemi
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1-6720-3937 / 2-6720-3937 / 3-6720-3937 / K1-6720-3937 / K2-6720-3937 / K3-6720-3937 DSS Racing 05-23 Chrysler / Dodge / Jeep / Ram 5.7L Hemi FX Series Forged Flat Top Pistons Set. Designed for the 348 Small Block Mopar Hemi Gen III, these forged pistons offer a comp height of 1.21 and a -1.5cc flat top design for optimal combustion. Featuring full-floating or press-fit pins and precise ring grooves, they deliver enhanced durability and performance. Ideal for enthusiasts seeking improved compression ratios and reliable power gains in their 5.7L Hemi engines.
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DSS Racing FX Series Forged Flat Top Pistons Set
Fits Most Chrysler / Dodge / Jeep / Ram 5.7L Hemi Models
1-6720-3937 / 2-6720-3937 / 3-6720-3937 / K1-6720-3937 / K2-6720-3937 / K3-6720-3937
Overview:
The DSS Racing FX Series Forged Flat Top Pistons Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, including the 348 Small Block Mopar Hemi Gen III. Designed for high-performance applications, these pistons offer a perfect balance of strength, durability, and precision fitment. Whether you are rebuilding your engine or upgrading for enhanced power and reliability, this piston set delivers consistent performance under demanding conditions.
Ideal for enthusiasts and professional builders alike, these pistons provide improved combustion efficiency and support higher compression ratios, making them suitable for street performance, mild racing, and custom engine builds.
Key Features:
Built with advanced engineering and premium materials, the DSS Racing FX Series pistons include the following features:
- Forged construction for superior strength and durability
- Flat top design with a -1.5cc dish for optimized combustion chamber volume
- Compression height of 1.21 inches for precise piston-to-deck clearance
- .945-inch 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
- Compatible with 3.578-inch stroke crankshafts and 6.243-inch connecting rods
- Available in multiple combustion chamber volumes to support approximate compression ratios of 10.5:1 (65cc), 9.5:1 (74cc), and 8.5:1 (85cc)
- Precision CNC-machined for consistent fit and finish
- Designed to fit most Chrysler / Dodge / Jeep / Ram 5.7L Hemi engines with minimal modifications
Construction & Design:
These pistons are crafted from high-grade forged aluminum alloy, providing an excellent strength-to-weight ratio that withstands the rigors of high-performance and forced induction applications. The flat top design enhances combustion efficiency by promoting a more uniform flame front and reducing detonation risks. The pistons are engineered with tight tolerances to ensure optimal ring seal and minimal friction, contributing to improved engine longevity and power output.
The wrist pin options allow for either full-floating or press-fit installation, giving builders flexibility based on their engine setup and performance goals. The ring grooves are precisely machined to accommodate performance rings that maintain excellent sealing under high cylinder pressures.
Installation & Fitment:
Installation of the DSS Racing FX Series pistons requires standard engine rebuilding procedures and is compatible with most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines. The pistons fit engines with a 3.578-inch stroke and 6.243-inch connecting rods, making them ideal for stock or mildly modified bottom ends. Minimal modifications are needed when replacing OEM pistons, but it is recommended to verify clearances and ring end gaps during installation.
These pistons are designed to work seamlessly with factory cylinder heads and standard engine components, ensuring a straightforward upgrade path for performance enthusiasts.
What's Included:
- Set of forged flat top pistons (quantity as required for engine rebuild)
- Wrist pins (.945" diameter) suitable for full-floating or press-fit installation
- Detailed specifications for compression height, ring groove dimensions, and combustion chamber volumes
Ideal For:
This piston set is ideal for automotive enthusiasts, engine builders, and racers looking to upgrade or rebuild their Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. It suits applications ranging from street performance to mild racing builds, offering enhanced durability and improved combustion characteristics. Whether you are restoring a classic Mopar Hemi or building a modern performance engine, these pistons provide a reliable foundation for increased power and 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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YEARMAKEMODELSUBMODEL2011 - 2024Chrysler3005.7L Hemi2005 - 2010Chrysler300C5.7L Hemi2009 - 2023DodgeChallenger5.7L Hemi2005 - 2023DodgeCharger5.7L Hemi2005 - 2011DodgeDakota5.7L Hemi2004 - 2025DodgeDurango5.7L Hemi2005 - 2008DodgeMagnum5.7L Hemi2002 - 2010DodgeRam5.7L Hemi2005 - 2010JeepCommander5.7L Hemi2005 - 2025JeepGrand Cherokee5.7L Hemi2022 - 2024JeepWagoneer5.7L Hemi2011 - 2024Ram15005.7L Hemi2019 - 2024Ram1500 Classic5.7L Hemi2010 - 2025Ram25005.7L Hemi2011 - 2012Ram35005.7L Hemi
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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 | |||||