Eagle 64125040 Competition Rotating Assembly for Chevy LS - 4.000" Stroke

The Eagle 64125040 Competition Rotating Assembly is a complete engine kit designed for high-performance Chevrolet LS applications. This assembly consists of name-brand quality components for a wide range of engines at an affordable price, engineered for builders seeking strength and reliability in demanding performance applications.

Kit Includes:

• Forged 4340 steel crankshaft made from a non-twist forging using certified 4340 steel
• Forged 4340 steel H-beam connecting rods with 6.125" center-to-center length
• Heavy-duty forged pistons with file-fit rings
• Rod and main bearings
• Complete hardware package

Key Features:

• 4.000" stroke crankshaft for increased displacement
• Forged 4340 steel cranks offer maximum strength at an affordable cost, multi-stage heat treated for greater strength, x-rayed and sonic tested to ensure quality
• 2-piece, forged, vacuum-degassed, 4340-certified steel construction provides outstanding strength while weighing less than stock rods
• Each rod is multi-stage heat-treated, x-rayed, sonic-tested, magnafluxed, 100 percent machined, and shot-peened to stress-relieve the metal
• .927" wrist pin diameter, bushed for full-floating pins
• Precision weight-matched components

This Competition series assembly is ideal for serious street performance and racing applications producing over 500 horsepower. Perfect for LS-based engine builds including LS1, LS2, LS3, LS6, and truck-based 4.8L/5.3L LS platforms. Please verify reluctor ring tooth count, bore size and cylinder head volume to ensure proper kit selection.

Note: Assembly part numbers that begin with "B" are balanced by Eagle and require no additional balancing. Part numbers that do not begin with "B" are unbalanced assemblies and must be balanced by a qualified machine shop before use.