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Bryan Hansen at R&R Performance measured the diameter and runout of the 390 block's main bearing bores. A straight machinist's bar was laid into the main saddle, and feeler gauges were used to see if any of the main bearing bores were out of alignment. The bores proved straight, but a check of the roundness with the dial bore gauge showed they were slightly egg shaped, so the block was align-honed. View Related Article
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