After years of service, Magnum crankshafts by Callies have established themselves asone of the most durable competition crankshafts ever produced. Magnum crankshafts are manufactured from ultra pure SAE 4340 steel. Callies then subjects this material tomultiple heat treatments, resulting in a crankshaft withunsurpassed wear and strength characteristics. All Magnum cranks feature Callies Ultra-Case heat treatment.

Each Magnum crank will have gun drilled mains and fully profiled counterweights, regardless of engine type. A typical 4.000" stroke Small Block Chevy will weigh less than 48 pounds. Magnum crankshafts are available for a variety of engine types and can be manufactured to your specific configuration.

Many crankshafts are counterweighted to offset simple balance forces detectedat main bearings 1 and 5 by today's precision balancers. Callies Magnum Mass Correct counterweights have been strategically placed to reduceimbalance forces over the entire length of the shaft. The result is a crankshaft exhibiting superior bearing life and minimal wear.

Material distribution over the rod journal arms and critical strength generating regions ofMagnum crankshafts has been enhanced as well. These slightdesign changes improve the strength to weight ratio, ensuring each Magnum crankshaft will have an extended fatigue resistant life.