Did you collect Data before you did these mods. RPM, Top Speed? With having these 2 data points, after you make any mods, this is when you can tell what the gains are........... Each small mod, may not do much, but when the sum are added up, you can end up with a larger overall...
If you look at the port roof, it angles down a bit, so by over boring, you are effectively lowering the roof the the port window. But this is a minuscule amount.
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