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When talking about engine mods for motocross bikes, the phrase "ported and polished" gets thrown around a lot. But do we all know what that really means? Turns out, according to Andrew Flores, Engine Research and Development at Race Tech, polishing is the last thing you want to do to intake and exhaust ports. We get into all the different ways a cylinder head can be manipulated and what each modification does so that you can have a better idea of what head mods are available and if any are right for you're motocross machine.