DSS Racing FX Series Forged Flat Top Pistons Set

Fits Most Chrysler / Dodge / Jeep / Ram 5.7L Hemi Models

1-6720-3917 / 2-6720-3917 / 3-6720-3917 / K1-6720-3917 / K2-6720-3917 / K3-6720-3917

Overview:

The DSS Racing FX Series Forged Flat Top Pistons Set is engineered specifically for Chrysler, Dodge, Jeep, and Ram vehicles equipped with the 5.7L Hemi engine. Designed to meet the demands of high-performance applications, these pistons offer a reliable upgrade for enthusiasts seeking enhanced durability and precision. Whether you are rebuilding your engine or upgrading for increased power and efficiency, this piston set delivers consistent performance and long-lasting strength.

Built to exacting standards, these pistons are ideal for street performance, mild racing, and heavy-duty use. Their flat top design optimizes combustion chamber dynamics, contributing to improved throttle response and power delivery.

Key Features:

The DSS Racing FX Series pistons combine advanced engineering with quality materials to provide superior performance and reliability. Key features include:

• Forged construction for maximum strength and durability under high stress
• Flat top piston design with -1.5cc volume for optimized combustion efficiency
• Comp height of 1.21 inches, engineered for precise piston-to-head clearance
• .945-inch wrist pin diameter available in full-floating or press-fit options
• 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 (65cc, 74cc, 85cc) to tailor compression ratios from 8.45:1 to 10.44:1
• Precision machining ensures consistent weight and balance for smooth engine operation

Construction & Design:

These pistons are crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight strength and thermal conductivity. The forging process enhances the metal’s grain structure, resulting in superior resistance to cracking and deformation under extreme heat and pressure. The flat top design reduces detonation risk while maintaining efficient combustion chamber shape.

Each piston features carefully engineered ring grooves and pin bosses to ensure optimal sealing and wrist pin retention. The option for full-floating or press-fit wrist pins allows customization based on engine build preferences and intended use.

Installation & Fitment:

The DSS Racing FX Series pistons are designed as direct replacements for most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines, making installation straightforward with minimal modifications required. Proper ring end gap and clearance checks are recommended during assembly to ensure optimal performance and longevity. These pistons fit engines with a 3.578-inch stroke and 6.243-inch connecting rods, matching factory specifications for seamless integration.

What's Included:

• Set of forged flat top pistons (quantity as per engine requirements)
• Wrist pins (.945" diameter), available in full-floating or press-fit configurations
• Precision-machined ring grooves ready to accept piston rings (rings not included)
• Installation guidelines and specifications

Ideal For:

This piston set is ideal for automotive enthusiasts, engine builders, and performance tuners looking to upgrade or rebuild Chrysler, Dodge, Jeep, or Ram 5.7L Hemi engines. Whether for street performance, mild racing, or heavy-duty applications, these pistons provide a durable and reliable foundation for increased power and 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.