Callies BBP425-CS Compstar Forged Steel Big Block Chevy Crankshaft 4.250 Stroke

The Callies BBP425-CS Compstar crankshaft delivers race-proven performance and durability for Big Block Chevy 454 engines. This forged 4340 steel crankshaft is engineered for sportsman racers who demand quality without compromise.

Key Specifications:

• Forged 4340 steel construction for maximum strength
• 4.250 inch stroke for increased displacement
• 2.750 inch main journal diameter
• 2.200 inch rod journal diameter
• Internal balance configuration
• 2-piece rear main seal design
• Deep nitriding for enhanced surface hardness and wear resistance

Performance Features:

• Center counterweighted design reduces bearing loads during high RPM operation
• All rod journals precision drilled for proper oiling
• Counterweights profiled for piston clearance
• 0.125 inch journal radii with conventional straight shot oiling
• Double stress relief operations ensure dimensional stability
• Consistent grind and polish with precise stroke and index tolerances

Designed by Callies engineers and finished in their facility, Compstar crankshafts maintain proper geometry and design throughout the manufacturing process. The deep nitride hardening makes these cranks ideal for abusive racing environments including dirt track and circle track applications. Typical weight for the 4.250 inch stroke is approximately 74 pounds, providing excellent strength-to-weight ratio for high-performance builds.