If you want details of how to get the most out of these engines, then a good search into the archives of this forum will give you a good starting point, that's where I started. The current fashion seems to be away from DIY engine building though, perhaps because the engines being professionally built have now got so extreme, individuals can't compete. But if your serious, next on the list has to be a Dyno, without which you will be fumbling in the dark. But that's not quite correct, because in theory, with the possible exception of adjusting the cam timing you could buy a new engine that would be as good as you could get, once run in, out of the box.
Of course in reality all really good engines will use selected parts to some extent, but finding selected parts is a bit like buying scratch cards. You can buy one card and win a million or buy a 100 and not even win a tenner. However, the odds are, the more you buy, the more chance you have.
So after you've built your engine the most important thing is run time. It's not about making power but reducing friction, some tuners will run their race engines on a Dyno for 10 hours before they go on a kart. At the end of this process, you may find what seemed to be a really promising engine turns out to be a bit off or a not so good engine turns into a monster.
Some of the tuners might disagree, but there is a fair bit of luck and even mystery in these engines.
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