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Old 08-23-2012, 06:25 PM
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Replace the balancer with a new 8 inch unit. All generation 1 sbc's were internal balance except the 400, which was external balanced which is why balancer and flexplates should not be interchanged between the two.
While you could use the balancer off the 305 the timing marks won't line up just as well as the 8 inch balancer does a better job.
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