Eagle 129424075 Competition Rotating Assembly 378 CID LS2/LS3 4.075" Bore

The Eagle 129424075 Competition Rotating Assembly is a high-performance engine kit designed for serious racing applications including nitrous oxide and forced-induction builds. This complete 378 cubic inch rotating assembly is engineered for Chevrolet LS2 and LS3 engines with a 58-tooth reluctor and delivers the strength and precision required for competitive motorsports.

Complete Assembly Includes:

• 3.622" stroke forged 4340 steel crankshaft with 58-tooth reluctor
• 6.125" H-beam connecting rods with 7/16" ARP 8740 bolts
• Forged 4032 Mahle flat-top pistons with -5.8cc dish, 4.075" bore
• Plasma-moly file-fit piston rings
• King XP performance rod and main bearings

Key Features:

• Forged 4340 steel crankshaft for maximum strength and durability
• H-beam connecting rods engineered for high-stress racing conditions
• Forged Mahle pistons deliver exceptional heat resistance and reliability
• King XP tri-metal bearings provide superior protection under extreme loads
• Designed for LS3 engines with 4.065" standard bore, machined to 4.075"
• Unbalanced assembly - requires professional balancing before installation

This Competition series rotating assembly is ideal for racers demanding maximum performance and reliability. The forged components and premium bearings ensure your engine can handle high RPM, boost pressure, and nitrous loads with confidence. Professional balancing by a qualified machine shop is required before installation.