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154 0412 Amc 03 Z

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The 390 and 401 engines have forged rods (most other AMC engines use cast rods). Due to the change in deck height from '69 to '70 models, there are two different length rods: '68-'69 390 rods (left) have 5.790-inch center-to-center lengths, while the '70 design (right) is 5.858 inches long. AMC factory-forged-rod failures are rare; just rebuild the big-end and remove any excess flash.