Callies BBI42B-MG Magnum Forged Crankshaft Big Block Chevy 4.875" Stroke

The Callies BBI42B-MG Magnum crankshaft delivers the perfect combination of strength and reduced weight for high-performance Big Block Chevy applications. Manufactured from ultra-pure AISI 4340 forged steel and subjected to multiple heat treatments, this crankshaft offers exceptional wear resistance and superior strength characteristics for demanding racing and high-horsepower street builds.

Advanced Engineering Features:

• 4340 forged steel construction with nitriding for enhanced durability
• 4.875" stroke for increased displacement and torque
• 2.750" main journal diameter (454 main bearing size)
• 2.200" rod journal diameter
• 2-piece rear main seal design
• Internal balance configuration
• Lightening holes in rod throws for optimized weight
• Gun-drilled mains for improved oil flow

Magnum Mass Correct Technology:

Callies design team has strategically optimized material distribution throughout this crankshaft to create a component that is both exceptionally strong and easy to balance. The proprietary Magnum Mass Correct counterweights are positioned to reduce imbalance forces across the entire shaft length, resulting in superior bearing life and minimal wear. Enhanced material distribution over rod journal arms and critical strength-generating regions improves the strength-to-weight ratio, ensuring extended fatigue-resistant service life.

This is a build-to-order crankshaft precision-machined on state-of-the-art CNC equipment and inspected to Callies exacting standards. Ideal for big block Chevy engines requiring a lightweight yet incredibly durable rotating assembly capable of handling extreme power levels.