Find 20hp in 5 places and all of a sudden you found yourself 100hp,or 10hp in 10places is also 100 total or why not an easy 5 hp in 20places?
The difference adds up quite quick when you start paying attention to stuff and is the reason why some poeple are engine builders while others are just (in best case scenarios) assemblers.
If we are going to ignore all the small stuff just because its not a raceengine we start to leave a whole lot on the table,a whole lot of "free" power,power that wont screw up your drivability,fuelconsumption or lifespan of the eninge.
An engine with a ton of very nice and expensive parts on it can be beat regarding power,durability,fuelmilage,performance and drivablitily by something built from much "simpler" parts if the builder has payed attention.
Not saying everyone has to pul out every trick in the book,sometime something simple will do just fine and sometimes one wants to assemble a bunch of very fine parts ignoring the fine details and the owner will be just happy about the result but the whole "ohh its just a streetengine and not a raceengine" is not the best argument for it looking at a much bigger picture.
