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have the block sonic checked and 1st check the main caps to see if they are tight in the block we have a wedge block from that time frame that we had program make over sized main caps to fit !!!

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Jim is correct,also look at the back of the block just above the bell housing bolts for any indication of a tag being glued on.Many of the street blocks came with a tag:bore to max.4.280 or 4.375.If not as Jimmy said sonic test and do it frequently on the Major and minor thrust.Try and maintain .180 after finish bore.