Eagle B12302L030 Competition Rotating Assembly Small Block Chevy - 350

The Eagle B12302L030 is a balanced competition-grade rotating assembly designed for small block Chevy 350 engines producing up to 750 horsepower. This complete assembly provides exceptional strength and reliability for high-performance street and racing applications.

Complete Assembly Includes:

• 3.480" stroke forged 4340 steel crankshaft with 2.100" rod journals
• 5.700" forged 4340 steel H-beam connecting rods
• 7/16" ARP 8740 cap screw rod bolts
• Icon 4032 forged flat top pistons (-3.7cc) for 4.030" bore
• Plasma-moly standard gap piston rings
• King XP series rod and main bearings

Specifications:

• Displacement: 355 cubic inches at 4.030" bore
• Compression ratio: 10.8:1 (58cc heads), 10.1:1 (64cc heads), 8.9:1 (76cc heads)
• Factory balanced assembly - ready to install
• Designed for 1-piece rear main seal (1986-1999 applications)
• Internal balance configuration

This assembly features Eagle's precision-forged 4340 chromoly steel components that are heat-treated for superior strength and durability. The forged H-beam rods utilize a 2-piece forging process for optimal grain structure alignment, while the crankshaft is micro-polished for improved oil flow and reduced friction. With the part number beginning with "B", this kit comes pre-balanced from Eagle and requires no additional balancing work.