Callies Performance BBO425-CS Big Block Chevy 4.000 Compstar Crankshaft BBC Forged 4340

Drawing from the deep history of experience at Callies, our Compstar engineers have been able to combine the best characteristics of performance crankshaft design into the Compstar ¿Compweight¿ for Big Block Chevy applications Produced from 4340 material that is triple heat treated and stress relieved during machining. Compstar BBC Compweights will remain true during severe duty use. All Compstar Compweights are center counterweighted for reduced bearing loads during high RPM use. Machined with .125 journal radii and conventional straight shot oiling, these cranks offer simple durability. With all 4 rod journals drilled, Compstar BBC Compweight cranks weigh in at 75lbs or less. Compweights are fully deep case nitrided. Available in 4.000, 4.250, 4.375 and 4.500 strokes Callies Crankshafts are at the top of the industry for quality of finish and reliability. Our precise, no compromise production efforts deliver dimensional accuracy that is second to none. Concentricity and surface finish are the two most desirable features in a high performance crankshaft journal. Each journal must be perfectly concentric to its specified center-line, and journal surface lobing (microscopic peaks and valleys in the journal surface) must be limited to no more than .00006¿ to further enhance oil film integrity at high engine speeds. Every crankshaft is 100 percent inspected for critical dimensions, and the manufacturing equipment is constantly monitored for tolerance drift and tool degradation. At Callies, quality and durability really are a driving force behind our products.

Rear Main Seal Style:2-piece
Engine Stroke (in):4.000 in.
Crankshaft Material:Forged 4340 steel
Engine Balance:Internal
Lightened:Yes
Requires Narrow Bearings:Yes
Rod Bearings Included:No
Main Bearings Included:No
Rod Journal Diameter (in):2.200 in.
Main Journal Diameter (in):2.750 in.
Balancer Bolt Thread Size:1/2-20 in.
Crankshaft Snout Style:Standard