Eagle B42107040 Balanced Street & Strip Rotating Assembly Oldsmobile 455-490

The Eagle B42107040 is a balanced street and strip rotating assembly designed to build an Oldsmobile 455 cubic inch engine into a powerful 490 cubic inch stroker. This complete internal engine kit delivers enhanced displacement and performance for classic Oldsmobile V8 builds.

Complete Assembly Includes:

• 4.500-inch stroke cast steel crankshaft for increased displacement
• 7.100-inch H-beam connecting rods with 7/16-inch ARP 8740 bolts
• Forged 4032 aluminum Diamond pistons with -15cc inverted dome, 4.165-inch bore
• Plasma-moly file-fit piston rings
• King SI performance rod and main bearings

This assembly is balanced by Eagle and requires no additional balancing before installation. Designed for street and strip applications producing up to 500 horsepower, this kit provides excellent reliability and performance for Oldsmobile engine builds. The forged pistons and upgraded connecting rods with ARP fasteners ensure durability under demanding conditions.