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More than likely the balancer bolt is not tight or not tight enough.The balancer wobles back and forth from on and off the throttle till it wears or sheers the key.

When it sheared the crank key it caused the harmonic balancer to move it knocked it out of balance.If im not mistaken these motors are like a 454 Chevy externally balanced.When the balancer moved it moved the heavy part of the balancer in a bad spot,it broke the crank.Vibration killed the...