Scat Engine Components Engine Crankshaft Rotating Assembly

Scat Engine Components: Purpose-Built Crankshaft Rotating Assemblies

When it comes to building a high-performance engine from the inside out, few names carry the weight of Scat Engine Components. Founded in Redondo Beach, California, Scat has spent over 50 years engineering and manufacturing some of the most respected crankshafts, connecting rods, and complete rotating assemblies in the performance aftermarket. That racing pedigree — spanning NASCAR, the Daytona 500, Top Fuel, and off-road competition — is baked directly into every engine crankshaft rotating assembly kit they produce.

What Sets Scat's Rotating Assembly Kits Apart

Rather than sourcing individual components and hoping they play well together, Scat's rotating assembly kits deliver a carefully matched system. The centerpiece of each kit is either a forged 4340 steel crankshaft or a Series 9000 cast crankshaft, paired with your choice of I-beam or H-beam connecting rods featuring cap-screw bolts. This gives builders the flexibility to spec the right strength-to-weight balance for their intended use — from a reliable street rebuild to a demanding track application.

Scat doesn't stop at the crank and rods. Each rotating assembly kit integrates rod and main bearings sourced from trusted names like King, Federal Mogul, or Clevite 77, matched to the specific application. Pistons and rings from top-tier manufacturers round out the package, ensuring every rotating component is dimensionally and dynamically compatible before the kit ever leaves the factory.

Crankshaft Options: Series 9000 to Full Forged

The Series 9000 platform is Scat's workhorse line for street performance and budget-conscious builds, pairing a quality cast crankshaft with forged or hypereutectic pistons and I-beam connecting rods — a proven combination for small- and big-block Chevy, Ford, and Mopar applications. For builders demanding more, Scat's forged 4340 crankshaft kits step up the material strength significantly, making them a natural choice for boosted, nitrous, or high-RPM race engines. Scat also produces its SCAT PACK series targeting modern platforms like the Chevy LS, 392/426 Hemi, and Ford 5.0 Coyote, using American-machined 4340 crankshafts and Pro Sport H-beam or Pro Series I-beam connecting rods.

Balanced and Ready to Run

For builders who want to minimize machine shop time, Scat offers pre-balanced rotating assembly kits balanced on-site using Hines balancers and delivered ready to install. This level of precision — the same quality standard used to supply OEM programs at GM, Ford, Chrysler, and more — translates directly to smoother idle, better power delivery, and reduced bearing wear over the life of the engine.

Whether you're rebuilding a classic small-block or stroking out a modern platform for the strip, Scat's crankshaft rotating assemblies provide a solid, engineered foundation for your build. Explore the full lineup below, or visit the Scat Engine Components brand page to see their complete catalog of cranks, rods, bearings, and more.