Ahhh ... engine blueprinting. Seems to me such variances can be attributed to quality control at the factory. It would be nice if a machinist calibrated the equipment for each individual block. But that would be too time consuming & expensive when doing large production numbers. This is why no one single number can be tied down since no two are exactly alike.
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1969 GTO hard top ~ Std bore 400, '70-RA3 block, 670 heads, Bal. & Blue... M22, 12-bolt w/3:55s
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