DSS Racing FX Series Forged Flat Top Piston Set

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

1-6710-3917 / 2-6710-3917 / 3-6710-3917 / K1-6710-3917 / K2-6710-3917 / K3-6710-3917

Overview:

The DSS Racing FX Series Forged Flat Top Piston 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 superior strength and durability compared to stock cast pistons. Ideal for enthusiasts and professional builders looking to enhance engine reliability and power output, this piston set is a direct fit for most 5.7L Hemi Gen III engines, including the 345 Small Block Mopar Hemi.

With a 3.917" bore size and a flat top design featuring a -1.5cc dish, these pistons provide an optimal balance of compression and combustion efficiency. Their forged construction ensures they can withstand the rigors of boosted, nitrous, or naturally aspirated high-performance setups.

Key Features:

These pistons incorporate advanced engineering and materials to deliver exceptional performance and longevity. Key features include:

• Precision forged from high-strength aluminum alloy for maximum durability
• Flat top design with a -1.5cc dish to optimize compression ratios and combustion
• Compatible with 3.917" bore engines, fitting most Chrysler / Dodge / Jeep / Ram 5.7L Hemi models
• Pin diameter of .927" with options for full-floating or press-fit configurations
• Ring groove dimensions of 1.2mm top and second rings, 3mm oil ring for effective sealing
• Comp height of 1.21" for precise piston-to-deck clearance and performance tuning
• Stroke compatibility of 3.578" and connecting rod length of 6.243" for balanced engine geometry
• Available in multiple compression ratio options: approximately 10.44:1 (65cc), 9.42:1 (74cc), and 8.45:1 (85cc) to suit various build goals

Construction & Design:

DSS Racing utilizes premium forged aluminum alloy to manufacture these pistons, ensuring superior strength and resistance to thermal and mechanical stress. The flat top design with a slight dish (-1.5cc) is engineered to optimize combustion chamber dynamics for improved power and efficiency. The pistons are CNC-machined to exacting tolerances, providing consistent fitment and performance across all cylinders.

The pin bore supports either full-floating or press-fit wrist pins, allowing builders to select the best option for their application. Ring grooves are precisely cut to accommodate high-performance piston rings, ensuring excellent sealing and oil control under demanding conditions.

Installation & Fitment:

This piston set is designed as a direct replacement for most Chrysler, Dodge, Jeep, and Ram 5.7L Hemi Gen III engines with a 3.917" bore. Installation requires standard engine assembly procedures and may involve professional machining to ensure proper clearances and fitment. The pistons are compatible with a 3.578" stroke crankshaft and 6.243" connecting rods, matching factory or aftermarket components commonly used in these engines.

Builders should verify compression ratio requirements and select the appropriate piston variant to match their cylinder head and combustion chamber specifications.

What's Included:

• Set of forged flat top pistons (quantity as required for engine configuration)
• Wrist pin options: full-floating or press-fit (depending on selected SKU)
• Detailed specifications for bore size, compression height, and ring groove dimensions

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding Chrysler / Dodge / Jeep / Ram 5.7L Hemi engines. Whether building a naturally aspirated street machine, a boosted drag racer, or a high-output off-road vehicle, these forged pistons provide the strength and precision needed to handle increased power levels and demanding 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.