DSS Racing FX Series Forged Piston Set

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

1-6703-3937 / 2-6703-3937 / 3-6703-3937 / K1-6703-3937 / K2-6703-3937 / K3-6703-3937

Overview:

The DSS Racing 5.7 Stroker Small Block Mopar Hemi Gen III FX Series Forged Piston Set is engineered for enthusiasts and builders seeking reliable, high-performance pistons for their 5.7L Hemi engines. Designed to fit most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi models, these pistons offer a perfect balance of strength, durability, and precision fitment. Whether you are rebuilding your engine or upgrading for increased power and longevity, this piston set delivers superior performance under demanding conditions.

With a focus on compatibility and performance, these forged pistons are ideal for stroker builds featuring a 4.050" stroke and 6.125" connecting rods, providing enhanced engine displacement and improved combustion efficiency. The pistons are designed to maintain optimal compression ratios across various combustion chamber sizes, ensuring versatility for different engine configurations.

Key Features:

The DSS Racing FX Series Forged Piston Set incorporates advanced design features and high-quality materials to meet the rigorous demands of performance applications:

• Compatible with 394 Small Block Mopar Hemi Gen III engines
• Comp height of 1.09" for precise deck clearance
• 12cc dish top design to optimize combustion chamber volume
• Pin diameter of .927" supporting full-floating or press-fit configurations
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring for effective sealing
• Designed for a 4.050" stroke and 6.125" connecting rods
• Available compression ratios approximately 10.49:1 (65cc), 9.6:1 (74cc), and 8.68:1 (85cc) to suit various performance needs
• Forged construction for superior strength and durability under high stress

Construction & Design:

These pistons are forged from premium-grade aluminum alloy, providing an excellent strength-to-weight ratio that enhances engine responsiveness and longevity. The forging process ensures a dense, uniform grain structure, reducing the risk of cracking or deformation under extreme heat and pressure. The -12cc dish top design helps control compression and reduce detonation risks, making these pistons suitable for both naturally aspirated and forced induction setups.

The piston pin bore is engineered to accommodate either full-floating or press-fit pins, offering flexibility depending on your engine build preferences. Precision-machined ring grooves ensure optimal ring sealing and reduced blow-by, contributing to improved combustion efficiency and oil control.

Installation & Fitment:

This piston set is designed to fit most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi engines equipped with Gen III small block Mopar Hemi architecture. Installation requires standard engine rebuilding procedures, and the pistons are compatible with a 4.050" stroke crankshaft and 6.125" connecting rods. Due to the forged construction and precise dimensions, minimal modifications are typically needed, but professional installation is recommended to ensure proper clearances and optimal engine performance.

What's Included:

• Set of forged pistons (quantity as per engine requirements)
• Piston pins compatible with full-floating or press-fit installation
• Ring grooves machined for 1.2mm top and second rings, 3mm oil ring

Ideal For:

This piston set is ideal for engine builders, performance enthusiasts, and professional shops upgrading or rebuilding 5.7L Hemi engines for street, strip, or mild racing applications. It suits those looking to increase engine displacement with a stroker setup while maintaining reliable compression ratios and durability under high-performance conditions.

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.