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CALBBP42B-MG 

4340 Crankshaft, 2-piece Seal, Internal Balance, Forged 4340 Steel, 4.250 in. Stroke, 2.200 in. Rod Pin, Chevy, 454

Callies crankshafts are manufactured from the finest forging, subject to the most critical quality control and inspection in the industry. They are premium heat treated to a depth of 0.015-0.022