Sorry, we have gone somewhat off topic from your original question. IMO - In my opinion.
Unfortunately blueprinting is not legal as it often, but not always, involves removing metal, which has become somewhat taboo in kart racing.
So with Parts selected engines, for example, with no specific head volume given for a GX160, one of the quests when parts selecting is to find a head with the smallest possible volume, combined with ports that flow the best (not nessasarily the most). Even heads from the same moulds vary, yet there are tens if not hundreds of different moulds out there, every one will produce slightly different power characteristics. Even though to be sure you need to measure in various ways and dyno each head, after a while a good engine builder gets a knack of finding by look and feel a potentially good one. Now repeat the process for virtually every other part of the engine.
Thus the more parts looked at the more power the ultimate engines produce. I suspect that the top builders keep the very best parts for engines that compete at the highest level, after all we all know that winning on a Sunday means selling on a Monday. Unfortunately there are limited numbers of good parts and even if you buy a parts selected engine from them you are unlikely to get the best, only perhaps better than average.
So back to blueprinting. With this method you take a part, almost any part and using the tolerences given, optimise by removing and sometimes adding small amounts of metal. This way, with the help of a good engineer it is technically possible for every competitor to have the best engine for minimal cost.
Of course you understand why the current engine builders might resist such a move.
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