Eagle B627623780 Balanced 8-Cylinder LS Rotating Assembly 4.000" Stroke 3.780" Bore

The Eagle B627623780 is a balanced rotating assembly engineered for GM Gen III/IV LS-based 8-cylinder engines. Built around a forged 4140 steel crankshaft with a 4.000" stroke and 24-tooth reluctor wheel, this kit pairs Eagle's proven 6.125" 4340 steel I-Beam connecting rods with forged DSS pistons sized for a 3.780" bore. Because the part number begins with "B," this assembly ships pre-balanced from the factory and requires no additional machine shop balancing before installation.

Key Features:

• Pre-balanced by Eagle — ready for assembly right out of the box, no additional balancing required
• Forged 4140 steel crankshaft — 4.000" stroke with 24-tooth reluctor wheel for Gen III/IV LS compatibility
• 6.125" 4340 steel I-Beam connecting rods — 7/16" ARP 8740 rod bolts for added strength and reliability
• Forged DSS pistons — sized for 3.780" bore, engineered for high-performance LS builds
• Performance rings and bearings included — high-quality rod and main bearings plus a matched ring set

Eagle Specialty Products rotating assemblies are test-fitted in-house to ensure proper fitment and function before shipping. This kit is ideal for builders looking to increase displacement or refresh an LS platform engine with proven forged internals. Always verify reluctor ring tooth count, bore size, and cylinder head volume prior to ordering to ensure proper kit selection.