SCAT Modern Muscle Engine Rotating Assemblies

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

1-48501

Overview:

The SCAT Modern Muscle Engine Rotating Assembly is a precision-engineered rotating assembly designed specifically for Chrysler, Dodge, Jeep, and Ram performance engines including the 5.7L Hemi, 6.1L SRT8, 6.4L 392, and the 6.2L Hellcat & Trackhawk variants. This assembly is ideal for enthusiasts and professional builders seeking a reliable, high-quality foundation for engine builds or rebuilds that demand durability and performance.

Built to exacting standards, this rotating assembly provides the core components necessary to upgrade or replace your engine’s internal rotating parts, ensuring smooth operation and long-lasting strength under high-stress conditions. It is perfect for muscle car restorations, performance upgrades, or custom engine projects.

Key Features:

This SCAT rotating assembly combines robust materials and precise engineering to deliver dependable performance for modern muscle engines. Key features include:

• Forged 4340 steel crankshaft for exceptional strength and durability
• Forged aluminum pistons with a dished design and two valve reliefs for optimal combustion chamber clearance
• Floating wrist pins for reduced friction and enhanced piston movement
• Plasmamoly piston rings included for superior sealing and wear resistance
• Forged 4340 steel I-beam connecting rods measuring 6.125 inches center to center
• Complete set of rod and main bearings at stock undersize for a precise fit
• Balanced internal engine components to maintain smooth operation (note: assembly is not externally balanced)
• Compatible with a 6.0L/368 engine displacement with a bore size of 3.927 inches (99.746 mm) and a stroke of 3.795 inches

Construction & Design:

SCAT’s rotating assembly is crafted from premium materials to withstand the rigors of high-performance applications. The crankshaft is forged from 4340 steel, known for its superior tensile strength and fatigue resistance, making it ideal for muscle car engines that experience high RPM and torque loads. The pistons are forged aluminum, offering a lightweight yet durable solution that helps improve throttle response and reduce reciprocating mass.

The connecting rods are also forged from 4340 steel and feature an I-beam design, providing an excellent balance of strength and weight. This design ensures durability under extreme conditions while maintaining engine efficiency. The piston rings utilize plasmamoly facing material, which enhances ring sealing and longevity, critical for maintaining compression and reducing oil consumption.

Installation & Fitment:

This rotating assembly is designed as a direct fit for Chrysler, Dodge, Jeep, and Ram engines with 5.7L Hemi, 6.1L SRT8, 6.4L 392, and 6.2L Hellcat & Trackhawk configurations. Installation requires standard engine assembly procedures and is best performed by experienced engine builders or professional shops. Note that this kit does not include harmonic balancer, flexplate, flywheel, camshaft, lifters, timing chain and gears, gaskets, oil pump, or assembly lubricant, so these components must be sourced separately.

Because the assembly is internally balanced, it is compatible with engines designed for internal balance setups. Proper machining and clearances should be verified during installation to ensure optimal performance and longevity.

What's Included:

• Forged 4340 steel crankshaft
• Forged aluminum pistons with two valve reliefs
• Floating wrist pins
• Plasmamoly piston rings
• Forged 4340 steel I-beam connecting rods (6.125" center to center)
• Rod bearings (stock undersize)
• Main bearings (stock undersize)

Ideal For:

This SCAT rotating assembly is ideal for muscle car enthusiasts, professional engine builders, and performance shops looking to build or rebuild Chrysler-based Hemi engines with reliable, high-quality rotating components. It suits applications ranging from street performance to moderate track use, providing a solid foundation for increased power and durability.

SCAT Crankshafts is part of the enthusiast aftermarket, offering components and accessories tailored to drivers who demand more from their vehicles. Their catalog supports everything from maintenance refreshes to performance-oriented upgrades, with a focus on quality and compatibility across popular platforms. If you’re building for the street with an eye toward track performance, SCAT Crankshafts is a solid option.