SCAT Modern Muscle Engine Rotating Assembly Kit

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

1-48507-020

Overview:

The SCAT Modern Muscle Engine Rotating Assembly Kit is engineered for enthusiasts and builders seeking a reliable, high-quality rotating assembly for their Chrysler, Dodge, Jeep, or Ram Hemi engines. Designed to fit a broad range of 5.7L to 6.4L Hemi models, including the 6.1L SRT8, 6.4L 392, and the 6.2L Hellcat and Trackhawk, this kit provides the essential internal components needed to build or rebuild a performance engine.

This kit is ideal for those looking to upgrade or replace their engine’s rotating assembly with forged components that offer durability and strength under demanding conditions. Whether you are restoring a classic muscle car or building a modern performance machine, SCAT’s rotating assembly delivers the foundation for a powerful and dependable engine build.

Key Features:

Built with precision and quality materials, this rotating assembly kit offers a range of features designed to enhance engine reliability and performance:

• Forged 4340 steel crankshaft for exceptional strength and durability
• Forged 4130 steel I-beam connecting rods with 6.125-inch center-to-center length
• Forged aluminum pistons with a dished design and two valve reliefs for optimal combustion chamber clearance
• Piston and ring oversize of 0.020 inches (0.510 mm) for precise bore fitment
• Press-fit or floating wrist pins for secure piston connection
• Includes piston rings, rod bearings, and main bearings at stock undersizes for ease of installation
• Rear main seal style is 1-piece for improved sealing and reliability
• Engine stroke of 4.050 inches and bore diameter of 3.947 inches (100.254 mm) matching 6.4L/392 displacement
• Balanced internally (not externally balanced) to maintain engine smoothness

Construction & Design:

SCAT’s rotating assembly is crafted with premium forged materials to withstand the rigors of high-performance applications. The crankshaft is made from forged 4340 steel, known for its superior tensile strength and fatigue resistance, ensuring longevity even under high RPM and load conditions. The connecting rods utilize forged 4130 steel with an I-beam design, providing an excellent strength-to-weight ratio and durability for aggressive driving and racing environments.

The pistons are forged aluminum with a dished top and two valve reliefs, engineered to optimize combustion efficiency while maintaining adequate clearance for high-lift camshafts. The kit’s components are precision machined to tight tolerances, ensuring proper fitment and reliable operation within the engine block.

Installation & Fitment:

This rotating assembly kit is designed as a direct fit for most Chrysler, Dodge, Jeep, and Ram vehicles equipped with 5.7L Hemi, 6.1L SRT8, 6.4L 392, and 6.2L Hellcat or Trackhawk engines. Installation requires standard engine rebuild procedures and should be performed by a professional or experienced engine builder to ensure proper clearances and assembly techniques.

Note that this kit does not include components such as the harmonic balancer, flexplate, flywheel, camshaft, lifters, timing chain and gears, gaskets, or oil pump. These items must be sourced separately to complete the engine build.

What's Included:

• Forged 4340 steel crankshaft
• Forged 4130 steel I-beam connecting rods (6.125-inch center-to-center)
• Forged aluminum pistons with two valve reliefs
• Piston rings (0.020-inch oversize)
• Rod bearings (stock undersize)
• Main bearings (stock undersize)

Ideal For:

This SCAT rotating assembly kit is perfect for engine builders, performance enthusiasts, and restorers working on Chrysler, Dodge, Jeep, or Ram Hemi engines from 5.7L to 6.4L displacement. It suits applications ranging from street performance upgrades to track-focused builds where durability and strength are paramount. The kit provides a solid foundation for high-performance engine builds requiring forged internals and precise engineering.

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.