DSS Racing Forged +4cc Dome Top Piston Set

Fits Most Chrysler / Dodge / Jeep / Ram 6.1L SRT8 Models

1-6827-4065 / 2-6827-4065 / 3-6827-4065 / K1-6827-4065 / K2-6827-4065 / K3-6827-4065

Overview:

The DSS Racing Forged +4cc Dome Top Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, delivering enhanced performance and durability. Designed to replace factory pistons, these forged pistons feature a +4cc dome top that increases compression ratios, improving combustion efficiency and power output. Ideal for enthusiasts and professional builders seeking reliable, high-strength components for naturally aspirated or mildly boosted applications.

With a bore size of 4.065" and a pin diameter of 0.984", these pistons maintain precise fitment and compatibility with the 371 Small Block Mopar Hemi Gen III platform. The 1.21" compression height ensures proper deck clearance and optimal piston-to-head geometry for improved engine response and longevity.

Key Features:

These pistons incorporate advanced design elements and manufacturing techniques to meet the demands of high-performance engines:

• Forged aluminum construction for superior strength and heat resistance
• +4cc dome top design to increase compression ratio and combustion efficiency
• Compatible with full-floating or press-fit wrist pins (0.984" diameter)
• Ring groove dimensions: 1.2mm top and second rings, 3mm oil ring for optimal sealing
• Designed for a 3.578" stroke and 6.243" connecting rod length setup
• Approximate compression ratios vary by combustion chamber size: 65cc (11.94:1), 74cc (10.68:1), 85cc (9.49:1)
• Precision machining ensures consistent piston-to-cylinder wall clearance and balanced performance
• Compatible with most Chrysler / Dodge / Jeep / Ram 6.1L SRT8 engines for direct fitment

Construction & Design:

DSS Racing pistons are crafted from high-grade forged aluminum alloy, providing an excellent strength-to-weight ratio that withstands the rigors of high-performance and racing environments. The forging process enhances grain structure and fatigue resistance, reducing the risk of piston failure under extreme conditions.

The dome top design not only increases compression but also promotes efficient flame propagation within the combustion chamber. Each piston is CNC-machined to tight tolerances, ensuring precise ring groove dimensions and pin bore alignment. This meticulous engineering supports reliable sealing, reduced friction, and improved engine efficiency.

Installation & Fitment:

These pistons are designed for direct replacement in most Chrysler, Dodge, Jeep, and Ram 6.1L SRT8 engines, including the 371 Small Block Mopar Hemi Gen III and FX platforms. Installation requires standard engine assembly procedures, with attention to proper ring end gap and wrist pin fitment, whether using full-floating or press-fit pins.

Due to the +4cc dome volume, piston-to-head clearance and compression ratio changes should be verified during assembly to ensure compatibility with the intended combustion chamber size and fuel requirements.

What's Included:

• Set of forged +4cc dome top pistons (quantity as per kit)
• Compatible wrist pins (full-floating or press-fit depending on selection)
• Precision-machined ring grooves ready for standard piston rings (rings not included)

Ideal For:

This piston set is ideal for performance enthusiasts, engine builders, and racers upgrading or rebuilding 6.1L SRT8 engines who seek increased compression and durability. It suits naturally aspirated builds aiming for higher power output as well as mild forced induction setups requiring stronger pistons to handle increased cylinder pressures.

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.