Eagle 12302L030 Competition Rotating Assembly Small Block Chevy Bore - 350 4.030

The Eagle 12302L030 Competition Rotating Assembly is engineered for high-performance small block Chevrolet 350 applications, delivering exceptional strength and reliability for engines producing up to 750 horsepower. This complete balanced assembly is designed for demanding racing applications including nitrous oxide and forced induction systems.

Complete Assembly Includes:

• Forged 4340 steel crankshaft with 3.480-inch stroke and 1-piece rear main seal configuration (1986-1999 applications)
• Forged 4340 steel H-beam connecting rods measuring 5.700 inches center-to-center
• 7/16-inch ARP 8740 cap screw rod bolts for maximum strength and reliability
• Icon forged 4032 aluminum flat top pistons with -3.7cc volume, sized for 4.030-inch bore
• Plasma-moly piston rings with standard gap configuration
• King XP series rod and main bearings for superior durability

Performance Specifications:

• Displacement: 355 cubic inches at 4.030-inch bore
• Compression ratio: 10.8:1 with 58cc heads, 10.1:1 with 64cc heads, 8.9:1 with 76cc heads
• Factory balanced assembly—ready to install with no additional balancing required
• Internally balanced design for smooth operation

This competition-grade rotating assembly provides the foundation for serious performance builds, combining premium forged components with precision balancing for reliability under extreme racing conditions.