IMO, blue printing is not nearly as important as it was when I was a lad. CNC machining at the factories puts the machines near perfect stock. Balancing the crankset and pistons may still be a good bet, but even this is pretty well handled by new manufacturing technology. We used to send motors off for a "blueprint and balance", made a very noticable difference in my 79-1/2 Honda 750 DOHC four valve. Not so much any more (unless you are buying a new Ural, Dneiper, Royal Enfield, or the low end Chinese manufacturers).
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