Eagle 129464030 LS Competition Rotating Assembly CID Stroke - 408 4.000

The Eagle 129464030 is a competition-grade rotating assembly designed for GM LS-series engines, delivering ultimate performance and reliability for builds producing up to 750 horsepower. This complete 408 cubic inch stroker kit features premium forged components engineered for demanding applications including racing, nitrous oxide, and forced induction.

Complete Kit Includes:

• Eagle forged 4340 steel crankshaft with 4.000-inch stroke
• Eagle H-beam connecting rods with 6.125-inch length
• Mahle or Arias forged pistons (4.030-inch bore)
• Hastings piston rings (file-fit style)
• Clevite or King high-performance bearings

Key Specifications:

• Displacement: 408 cubic inches at 4.030-inch bore
• Stroke: 4.000 inches
• Rod length: 6.125 inches
• Designed for internal balance
• Unbalanced assembly - professional machine shop balancing required before installation

This kit is compatible with LS2, LQ4, LQ9, LY6, and L76 engines that feature a standard bore size of 4.000 inches. The 4.030-inch bore makes this a .030-inch oversized application. All Eagle Competition assemblies are manufactured using state-of-the-art equipment and undergo thorough quality control inspection to ensure they meet the demands of serious performance applications.