Callies Mopar Gen III Cast Iron Engine Block

2005–Present Chrysler / Dodge / Jeep / Ram 5.7L Hemi / 6.1L SRT8 / 6.4L 392 / 6.2L Hellcat & Trackhawk

S0035

Overview:

The Callies Mopar Gen III Cast Iron Engine Block with OptiTorque Main Stud Kit is a premium replacement block designed for high-performance Mopar Hemi engines. Engineered to accommodate the 5.7L Hemi, 6.1L SRT8, 6.4L 392, and 6.2L Hellcat & Trackhawk powerplants, this block offers a robust foundation for engine builds requiring durability and precision. Ideal for enthusiasts and professional builders alike, it ensures reliable strength and longevity under demanding conditions.

Featuring a cast iron construction and OEM deck height, this block maintains factory specifications while enhancing structural integrity. The included OptiTorque main stud kit provides superior clamping force for the main caps, improving bottom-end stability and reducing the risk of failure during high-stress operation.

Key Features:

This Mopar Gen III engine block combines quality materials and thoughtful engineering to meet the needs of performance builders:

• Cast iron block material for exceptional strength and durability
• OEM deck height of 9.250 inches to maintain factory geometry
• Finished cylinder bores with a 4.100-inch bore size as shipped, ready for final honing
• Standard camshaft location compatible with Gen III Hemi configurations
• Billet steel main caps included for enhanced rigidity
• OptiTorque main stud kit included for superior main cap fastening
• One-piece rear main seal style for reliable sealing and ease of installation
• Main cap fasteners included to ensure proper assembly
• Sold individually, allowing for flexible build options

Construction & Design:

The engine block is crafted from high-grade cast iron, chosen for its excellent wear resistance and ability to withstand high combustion pressures. The block’s OEM deck height preserves the original engine geometry, ensuring compatibility with existing components and minimizing the need for custom modifications.

Billet steel main caps provide a significant upgrade over stock cast caps, offering improved strength and durability to handle increased horsepower and torque. The OptiTorque main stud kit enhances main cap retention, reducing the likelihood of cap walk or loosening under extreme loads.

Installation & Fitment:

This engine block is designed as a direct replacement for Mopar Gen III Hemi engines, including 5.7L Hemi, 6.1L SRT8, 6.4L 392, and 6.2L Hellcat & Trackhawk applications. It fits factory engine bays without modification, making it suitable for rebuilds or performance upgrades.

While the block comes with finished cylinder bores, final honing and machining may be required to meet specific build tolerances. Main bearings, cam bearings, and freeze plugs are not included and must be sourced separately. Professional installation is recommended to ensure optimal assembly and performance.

What's Included:

• Callies Mopar Gen III Cast Iron Engine Block
• Billet steel main caps
• OptiTorque main stud kit
• Main cap fasteners

Ideal For:

This engine block is perfect for Mopar enthusiasts and professional engine builders seeking a durable, high-quality foundation for performance or restoration projects. It is especially suited for those upgrading or rebuilding 5.7L Hemi, 6.1L SRT8, 6.4L 392, or 6.2L Hellcat & Trackhawk engines who require enhanced bottom-end strength and reliability.

Callies Performance is known for high-end rotating-assembly components—especially crankshafts and connecting rods—built for serious horsepower and demanding race conditions. Focused on precision manufacturing and durability, Callies supports builders who need confidence at high RPM and high cylinder pressure, whether it’s drag racing, boosted street builds, or endurance-focused powerplants.